A micro-liquid adjuvant mixing and dispensing device
Patent Information
- Application Number
- CN202610995665.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-06
- Publication Date
- 2026-10-27
AI Technical Summary
[0002]液态助剂是用来改善主料性能的辅助化学液体，绝大多数场景添加在0.1%～2%之间，而液态助剂的具体添加量需要在实验室做实验获得，实验状态下，为了避免原料的浪费，主料的总质量并不多，那么在实验的条件下，在向总质量并不多的主料中添加液态助剂时添加的更少、更精准，微量添加液态助剂并不是行业难题，例如成熟的失重式微量液体配料系统，可达±0.05%，适配0.01%级别超微量添加，但该系统成本昂贵，仅设备费用高达几十万，占地大，很多中小型涂料、胶黏剂、塑料改性厂由于利润微薄，舍不得升级设备，依赖于人工粗放投料，这也就是为什么部分厂商依然存在投料不准的问题，这不是技术不行，而是经济性的选择；
[0014]与现有技术相比，本发明的有益效果是：本方案通过在变径部处设置能够膨胀的中空弹性体来实现更精准的液态助剂添加，外部筒体中的液态助剂总量不变，通过向中空弹性体中注入超纯脱气水，使中空弹性体膨胀，中空弹性体在膨胀的过程中，会将外部筒体中的液态助剂挤压出去，由于中空弹性体位于出液端附近，一方面挤压推送行程短，可大幅降低高黏度液态助剂流动滞后与筒壁挂壁残留问题，排料一致性更好，另一方面能够及时驱散出液口积聚的气泡，避免气泡压缩、气堵引发的计量偏差，同时膨胀驱动作用力直接作用于出料侧，流量调节响应灵敏，有效提升微量助剂加注精度与控制稳定性，中空弹性体继续膨胀，中空弹性体会与变径部的内壁接触，中空弹性体会继续膨胀，中空弹性体与变径部接触的部分将变径部分成上下两个完全隔绝的部分，中空弹性体向出口处继续膨胀，将靠近出口处的液态助剂继续挤压排出，此时中空弹性体向上膨胀被限位约束，形变仅能朝向出液口单向挤压出料，该结构等效构建出小容积、短行程的独立挤压腔，既能够避免压力双向耗散，让弹性体膨胀量与出料体积对应，还可以依托小腔体结构削弱气泡压缩、黏性滞后带来的计量误差，进一步提升微量加注的精准度，且没有反复多次吸液、加注，操作繁琐，多次动作又会引入新的气泡，增加人工操作误差的缺点。
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Figure CN122974200A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of additive technology, specifically relating to a micro-volume liquid additive mixing and dispensing device. Background Technology
[0002] Liquid additives are auxiliary chemical liquids used to improve the performance of main materials. In most cases, they are added between 0.1% and 2%. However, the specific amount of liquid additives to be added needs to be determined through laboratory experiments. Under experimental conditions, in order to avoid waste of raw materials, the total mass of the main material is not large. Therefore, when adding liquid additives to the main material with a small total mass, it is necessary to add less and more precisely. Adding liquid additives in trace amounts is not an industry problem. For example, mature loss-in-weight micro-liquid dispensing systems can achieve ±0.05% and are suitable for ultra-trace additions at the 0.01% level. However, such systems are expensive, with equipment costs alone reaching hundreds of thousands of yuan and large footprints. Many small and medium-sized coating, adhesive, and plastic modification plants are reluctant to upgrade their equipment due to meager profits and rely on manual and extensive feeding. This is why some manufacturers still have the problem of inaccurate feeding. This is not due to a lack of technology, but rather an economic choice. Handheld liquid additive dispensing devices operate on a principle similar to syringes. A circuit board controls an electric screw to drive a plunger in reciprocating motion, working in conjunction with a one-way valve to complete additive suction and discharge. The dispensing flow rate is adjusted by changing the screw feed speed. The handheld design allows for the addition of minute amounts of additives. However, handheld devices generally cannot meet laboratory-level requirements for micro-dosing. Typically, liquid additives have a certain viscosity and poor flowability, and contain numerous tiny air bubbles. These factors contribute to the inaccurate dispensing of traditional handheld liquid additive dispensing devices. For example, assuming no error in plunger movement, the presence of numerous tiny air bubbles in the liquid additive forces the gas in the liquid additive to be compressed, resulting in inaccurate dispensing. This is especially problematic for larger diameters of the additive. For liquid additive adding equipment with a longer effective stroke length, the error is greater when the plunger moves directly. Under the same bubble content ratio, the larger the total volume of the inner cavity, the larger the absolute value of the total bubble volume, the larger the total compressible space, and the greater the volume difference caused by a single compression. During the long stroke plunger advancement process, the cumulative effects of bubble compression, liquid lag, and material adhering to the pipe wall are longer, and the cumulative error is added synchronously with the stroke. The pressure distribution inside the large inner diameter cavity is uneven, and the degree of bubble compression is inconsistent in different places, resulting in poorer metering consistency. On the other hand, liquid additive adding equipment with a short stroke and small diameter has a very small total displacement. If a large amount of additive needs to be added in multiple times, it is necessary to repeatedly draw liquid and add it, which is cumbersome. Multiple actions will also introduce new bubbles, increasing the error of human operation. Summary of the Invention
[0003] To address the problems mentioned in the background section, this invention provides a micro-volume liquid additive mixing and dispensing device. Ultrapure degassed water is introduced into the elastomer to cause it to expand. Before it adheres to the inner wall of the variable diameter chamber, it is extruded and discharged nearby, resulting in a short stroke, reducing metering deviations caused by wall residue and air bubbles, and providing sensitive flow response. After the elastomer is pressed against the inner wall of the variable diameter chamber, it separates into two isolated chambers. Deformation can only unidirectionally extrude towards the outlet, forming a small-volume, short-stroke extrusion chamber, further improving the accuracy of micro-volume dispensing.
[0004] To achieve the above objectives, the present invention provides the following technical solution: a micro-volume liquid additive mixing and dispensing device, comprising an outer cylinder and a piston movably sealed within the inner wall of the outer cylinder. A push rod is fixedly connected to the top of the piston, and a push handle is provided at the top of the push rod. Finger wings are provided on the outer side of the top opening of the outer cylinder. A variable diameter section is provided at the bottom of the outer cylinder, which is arranged with a larger diameter at the top and a smaller diameter at the bottom. The large diameter end of the variable diameter section is smoothly connected to the cylindrical section of the outer cylinder, and the small diameter end of the variable diameter section is smoothly connected to the outer Luer cone base. A hollow elastomer is provided inside the variable diameter section. The volume of the inner side of the hollow elastomer is controlled by water injection. In the naturally contracted state, there is a gap between the hollow elastomer and the inner wall of the variable diameter section. In the liquid-filled and expanded state, the hollow elastomer is in contact with the inner wall surface of the variable diameter section.
[0005] As a preferred embodiment of the micro-liquid additive mixing and dispensing device of the present invention, the top hardness and elasticity of the hollow elastomer are greater than those of the sidewall and bottom of the hollow elastomer.
[0006] As a preferred embodiment of the micro-liquid additive mixing and dispensing device of the present invention, the hollow elastomer is capable of moving in the axial direction of the outer cylinder.
[0007] As a preferred embodiment of the micro-liquid additive mixing and dispensing device of the present invention, a rigid water supply pipe is fixedly connected to the top of the hollow elastomer and communicates therewith. A water storage shell is fixedly connected to the top end of the rigid water supply pipe. An electric lead screw A is fixedly connected to the inner side of the top end of the water storage shell. A plunger head is fixedly connected to the end of the telescopic main shaft of the electric lead screw A. An electronic control component is fixedly connected to the outer side of the top end of the water storage shell.
[0008] As a preferred embodiment of the micro-liquid additive mixing and dispensing device of the present invention, a fixing plate is inserted and fixed to the inner side of the top of the outer cylinder, a limiting groove for the fixing plate to slide is opened on the side wall of the push rod, a threaded sleeve is fixedly connected to one end of the fixing plate, and an external thread that mates with the threaded sleeve is provided on the top of the rigid water supply pipe.
[0009] As a preferred embodiment of the micro-liquid additive mixing and dispensing device of the present invention, the feed rate of the plunger head controlled by the electric screw A to inject water into the hollow elastomer gradually increases.
[0010] As a preferred embodiment of the micro-volume liquid additive mixing and dispensing device of the present invention, it further includes a sealing head for sealing the outer Luer cone base, a quick-release clamp is fitted on the outside of the push rod, and a gasket is sandwiched between the quick-release clamp and the syringe finger wing.
[0011] As a preferred embodiment of the micro-volume liquid additive mixing and dispensing device of the present invention, the outer surface of the finger wing is engaged with a limit card, and the top surface of the limit card is used to restrict the position of the quick-release clamp.
[0012] As a preferred embodiment of the micro-volume liquid additive mixing and dispensing device of the present invention, an annular cavity is provided on the inner side of the piston, and a through hole A communicating with the annular cavity is provided at the bottom of the piston. An electric lead screw B is fixedly connected to the top surface of the annular cavity, and a rubber plug that cooperates with the through hole A is fixedly connected to the end of the telescopic main shaft of the electric lead screw B. The diameter of the through hole A is larger than the diameter of the telescopic main shaft of the electric lead screw B. In its natural state, the rubber plug is a frustum-shaped cone with a bottom diameter larger than a top diameter.
[0013] As a preferred embodiment of the micro-liquid additive mixing and dispensing device of the present invention, a micro vacuum pump and a rechargeable battery are fixedly connected to the top of the piston, and a through hole B is opened on the top of the piston to connect the annular cavity with the micro vacuum pump. A one-way valve is installed inside the through hole B.
[0014] Compared with existing technologies, the beneficial effects of this invention are as follows: This solution achieves more precise liquid additive addition by setting an expandable hollow elastomer at the variable diameter section. The total amount of liquid additive in the outer cylinder remains unchanged. By injecting ultrapure degassed water into the hollow elastomer, the hollow elastomer expands. During the expansion process, the hollow elastomer squeezes out the liquid additive in the outer cylinder. Since the hollow elastomer is located near the liquid outlet, on the one hand, the squeezing and pushing stroke is short, which can significantly reduce the flow lag and residue on the cylinder wall of high-viscosity liquid additives, resulting in better discharge consistency. On the other hand, it can promptly disperse the air bubbles accumulated at the liquid outlet, avoiding metering deviations caused by air bubble compression and air blockage. At the same time, the expansion driving force acts directly on the discharge side, resulting in sensitive flow regulation response and effectively improving the accuracy and control stability of micro-additive addition. As the hollow elastomer continues to expand, it comes into contact with the inner wall of the variable diameter section. The portion of the hollow elastomer in contact with the variable diameter section divides the section into two completely isolated parts. The hollow elastomer continues to expand toward the outlet, squeezing out the liquid additive near the outlet. At this point, the upward expansion of the hollow elastomer is constrained, and the deformation can only be squeezed out in one direction toward the liquid outlet. This structure effectively creates a small-volume, short-stroke independent extrusion chamber, which can avoid bidirectional pressure dissipation, ensuring that the expansion of the elastomer corresponds to the output volume. It can also reduce the measurement error caused by bubble compression and viscosity hysteresis by relying on the small cavity structure, further improving the accuracy of micro-dispensing. Moreover, it avoids the disadvantages of repeated liquid aspiration and dispensing, which are cumbersome to operate and introduce new bubbles with repeated actions, increasing the error of manual operation. Attached Figure Description
[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an exploded view of part of the structure of the present invention; Figure 3 This is a cross-sectional view of the overall structure after the piston moves in this invention; Figure 4 In this invention Figure 3 A schematic diagram of the structure at point A; Figure 5 This is a cross-sectional view of the overall structure of the piston before it moves in this invention; Figure 6 In this invention Figure 5 A schematic diagram of the structure at point B; Figure 7 This is a schematic diagram of the expanded structure of the hollow elastomer in this invention; Figure 8 In this invention Figure 7 A schematic diagram of the structure at point C; In the picture: 1. Outer cylinder; 2. Piston; 3. Push rod; 4. Push handle; 5. Finger wing; 6. Variable diameter section; 7. Hollow elastomer; 8. Rigid water supply pipe; 9. Water storage shell; 10. Electric lead screw A; 11. Plunger head; 12. Electrical control components; 13. Fixing plate; 14. Limiting groove; 15. Threaded sleeve; 16. Sealing head; 17. Quick-release clamp; 18. Gasket; 19. Limiting card; 20. Annular cavity; 21. Through hole A; 22. Electric lead screw B; 23. Rubber plug; 24. Through hole B; 25. Check valve; 26. Miniature vacuum pump; 27. Rechargeable battery; 28. Charging port; 29. Limiting ring; 30. Cone head. Detailed Implementation
[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0017] like Figures 1-8 As shown: A micro-volume liquid additive mixing and dispensing device includes an outer cylinder 1 and a piston 2 movably sealed to the inner wall of the outer cylinder 1. A push rod 3 is fixedly connected to the top of the piston 2, and a push handle 4 is provided on the top of the push rod 3. A finger wing 5 is provided on the outer side of the top opening of the outer cylinder 1. A variable diameter section 6 is provided at the bottom of the outer cylinder 1. The variable diameter section 6 is arranged with a larger diameter at the top and a smaller diameter at the bottom. The large diameter end of the variable diameter section 6 is smoothly connected to the cylindrical section of the outer cylinder 1, and the small diameter end of the variable diameter section 6 is smoothly connected to the outer Luer cone base. A hollow elastomer 7 is provided inside the variable diameter section 6. The volume of the inner side of the hollow elastomer 7 is controlled by water injection. In the naturally contracted state, there is a gap between the hollow elastomer 7 and the inner wall of the variable diameter section 6. This gap can prevent the liquid additive from entering when it is extracted. In the liquid-filled and expanded state, the hollow elastomer 7 is in contact with the inner wall surface of the variable diameter section 6.
[0018] Liquid additives are auxiliary chemical liquids used to improve the performance of main materials. In most cases, they are added between 0.1% and 2%. However, the specific amount of liquid additives to be added needs to be determined through laboratory experiments. Under experimental conditions, in order to avoid waste of raw materials, the total mass of the main material is not large. Therefore, when adding liquid additives to the main material with a small total mass, it is necessary to add less and more precisely. Adding liquid additives in trace amounts is not an industry problem. For example, mature loss-in-weight micro-liquid dispensing systems can achieve ±0.05% and are suitable for ultra-trace additions at the 0.01% level. However, such systems are expensive, with equipment costs alone reaching hundreds of thousands of yuan and large footprints. Many small and medium-sized coating, adhesive, and plastic modification plants are reluctant to upgrade their equipment due to meager profits and rely on manual and extensive feeding. This is why some manufacturers still have the problem of inaccurate feeding. This is not due to a lack of technology, but rather an economic choice. Handheld liquid additive dispensing devices operate on a principle similar to syringes. A circuit board controls an electric screw to drive a plunger in reciprocating motion, working in conjunction with a one-way valve 25 to complete additive suction and discharge. The dispensing flow rate is adjusted by changing the screw feed speed. The handheld design allows for the addition of minute amounts of additives. However, handheld devices generally cannot meet laboratory-level requirements for micro-dosing. Typically, liquid additives have a certain viscosity and poor flowability, and contain numerous tiny air bubbles. These factors contribute to the inaccurate dispensing of traditional handheld liquid additive dispensing devices. For example, assuming no error in plunger movement, the presence of numerous tiny air bubbles in the liquid additive forces the gas in the liquid additive to be compressed, resulting in inaccurate dispensing. For larger diameters... For liquid additives adding equipment with a longer effective stroke length, the error is greater when the plunger moves directly. Under the same bubble content ratio, the larger the total volume of the inner cavity, the larger the absolute value of the total bubble volume, the larger the total compressible space, and the larger the volume difference caused by a single compression. During the long stroke plunger advancement process, the cumulative effects of bubble compression, liquid lag, and material adhering to the pipe wall are longer, and the cumulative error is added synchronously with the stroke. The pressure distribution inside the large inner diameter cavity is uneven, and the degree of bubble compression is inconsistent in different places, resulting in poorer metering consistency. On the other hand, liquid additives adding equipment with a short stroke and small diameter has a very small total displacement. If a large amount of additives needs to be added in multiple times, it is necessary to repeatedly draw liquid and add it, which is cumbersome. Multiple actions will also introduce new bubbles, increasing the error of human operation. This solution achieves more precise addition of liquid additives by incorporating an expandable hollow elastomer 7 at the variable diameter section 6. Figure 5 and Figure 8In comparison, the total amount of liquid additive in the outer cylinder 1 remains unchanged. By injecting ultrapure degassed water (hereinafter referred to as water addition) into the hollow elastomer 7, the hollow elastomer 7 expands. During the expansion process (before the hollow elastomer 7 contacts the inner wall of the variable diameter section 6), it will squeeze out the liquid additive in the outer cylinder 1. Since the hollow elastomer 7 is located near the liquid outlet, on the one hand, the squeezing and pushing stroke is short, which can significantly reduce the flow lag of high-viscosity liquid additives and the problem of residues adhering to the cylinder wall, resulting in better discharge consistency. On the other hand, it can promptly disperse the air bubbles accumulated at the liquid outlet, avoiding metering deviations caused by air bubble compression and air blockage. At the same time, the expansion driving force acts directly on the discharge side, and the flow rate adjustment response is sensitive, effectively improving the accuracy and control stability of micro-additive dosing. The hollow elastomer 7 continues to expand, and the hollow elastomer 7... The elastomer 7 will contact the inner wall of the variable diameter section 6, and the hollow elastomer 7 will continue to expand. The part of the hollow elastomer 7 that contacts the variable diameter section 6 divides the variable diameter section 6 into two completely isolated parts. The hollow elastomer 7 continues to expand towards the outlet, squeezing out the liquid additive near the outlet. At this time, the upward expansion of the hollow elastomer 7 is limited and constrained, and the deformation can only squeeze the material out in one direction towards the liquid outlet. This structure is equivalent to constructing a small-volume, short-stroke independent extrusion chamber, which can avoid bidirectional pressure dissipation, make the expansion of the elastomer correspond to the output volume, and also rely on the small cavity structure to reduce the measurement error caused by bubble compression and viscosity hysteresis, further improving the accuracy of micro-dispensing. Moreover, it avoids the disadvantages of repeated liquid aspiration and dispensing, which are cumbersome to operate and introduce new bubbles with repeated actions, increasing the error of manual operation.
[0019] In an optional embodiment, the top hardness and elasticity of the hollow elastomer 7 are greater than those of the sidewalls and bottom of the hollow elastomer 7.
[0020] In this embodiment, as Figure 8 It can be seen that the top of the hollow elastomer 7 is thicker and the sidewall is thinner. This will minimize the disadvantage of the hollow elastomer 7 expanding upward when it expands, so that after the hollow elastomer 7 comes into contact with the inner wall of the variable diameter part 6, the hollow elastomer 7 can only expand downward, which further improves the accuracy of discharging liquid additives.
[0021] In an optional embodiment, the hollow elastomer 7 is movable in the axial direction of the outer cylinder 1.
[0022] In this embodiment, the hollow elastomer 7 can move along the axial direction of the outer cylinder 1, thereby adjusting the gap between the hollow elastomer 7 and the inner wall of the variable diameter section 6. The gap can be adjusted according to the viscosity of the liquid additive; the better the fluidity of the liquid additive, the smaller the gap can be.
[0023] In an optional embodiment, a rigid water supply pipe 8 is fixedly connected to the top of the hollow elastomer 7 and communicates with it. The smooth outer wall of the rigid water supply pipe 8 slides and seals with the inner wall of the piston 2. A water storage shell 9 is fixedly connected to the top of the rigid water supply pipe 8. An electric lead screw A10 is fixedly connected to the inner side of the top of the water storage shell 9. A plunger head 11 is fixedly connected to the end of the telescopic main shaft of the electric lead screw A10. An electronic control assembly 12 is fixedly connected to the outer side of the top of the water storage shell 9.
[0024] In this embodiment, the internal components of the electronic control assembly 12 include at least a main control microcontroller, a key input unit, a display unit, a lead screw drive unit, a displacement detection encoder, a travel limit device, a speed adjustment drive circuit, a wireless communication module, an air pump on / off execution relay, a power management module, and an energy storage battery. Human-machine interaction is performed through the electronic control component 12. The required amount of liquid auxiliary agent to be fed is input into the electronic control component 12, and the electronic control component 12 controls the electric lead screw A10 to work. The electric lead screw A10 pushes the plunger head 11 to move, pushing the water inside the water storage shell 9 into the hollow elastomer 7 through the rigid water supply pipe 8.
[0025] In an optional embodiment, a fixing plate 13 is inserted and fixed to the inner side of the top of the outer cylinder 1, and a limiting groove 14 is provided on the side wall of the push rod 3 for the fixing plate 13 to slide. A threaded sleeve 15 is fixedly connected to one end of the fixing plate 13, and the top of the rigid water supply pipe 8 is provided with an external thread that mates with the threaded sleeve 15.
[0026] In this embodiment, the threaded sleeve 15 can be fixed to the outer cylinder 1 by the fixing plate 13. The limiting groove 14 opened on the side wall of the push rod 3 can ensure that the push rod 3 is not interfered with by the fixing plate 13 when it moves. By rotating the water storage shell 9 by hand, the water storage shell 9 will drive the rigid water supply pipe 8 to rotate. The thread on the top of the rigid water supply pipe 8 cooperates with the threaded sleeve 15 to adjust the height of the rigid water supply pipe 8, thereby adjusting the gap between the hollow elastic body 7 and the inner diameter of the variable diameter part 6 in the initial state.
[0027] In an optional embodiment, the electric lead screw A10 controls the plunger head 11 to move at a gradually increasing feed rate to inject water into the hollow elastomer 7.
[0028] In this embodiment, since the liquid additive has a certain viscosity, in order to reduce the sticking and stringing phenomenon between the liquid additive and the cone head 30, an electric screw A10 is used to control the movement of the plunger head 11 to gradually increase the water injection rate into the hollow elastomer 7. That is to say, the expansion rate of the hollow elastomer 7 is not fixed, but gradually accelerates. This allows the hollow elastomer 7 to expand slowly before contacting the inner wall of the variable diameter section 6, and then accelerates after contact, thereby increasing the discharge speed. The residual liquid adhering to the cone mouth is removed by the fluid flushing action, and the end discharge thrust is sufficient and the flow is cut off cleanly, suppressing the phenomenon of additive sticking and stringing at the cone head 30.
[0029] In an optional embodiment, it also includes a sealing head 16 for sealing the outer Luer cone base, a quick-release clamp 17 is fitted on the outside of the push rod 3, and a gasket 18 is sandwiched between the quick-release clamp 17 and the syringe finger wing 5.
[0030] In this embodiment, when the sealing head 16 is installed on the outer Luer cone base, the outer cylinder 1 can be fully enclosed. At this time, the push handle 4 is pulled to create negative air pressure in the outer cylinder 1, thereby achieving the effect of vacuum defoaming. Since vacuum defoaming takes more than one minute, pulling the push handle 4 by hand for a long time will cause hand soreness. Therefore, after the push rod 3 is pulled out, it is locked to the outer surface of the push rod 3 by the quick-release clamp 17 to prevent the push rod 3 from returning to its original position due to air pressure. The shim 18 can prevent the quick-release clamp 17 from falling into the gap between the outer cylinder 1 and the push rod 3. It should be noted that when performing vacuum defoaming, the total amount of liquid additive in the outer cylinder 1 should not exceed two-thirds of the total capacity of the outer cylinder 1. In addition, when extracting the liquid additive, it should first be extracted directly through the outer Luer cone base. At this time, the outer cylinder 1 contains a large amount of air. Then, the outlet of the outer cylinder 1 should be turned upward (i.e., the outer Luer cone base should be turned upward), so that the air in the outer cylinder 1 is squeezed upward by the liquid additive. Then, push the push handle 4 so that the piston 2 squeezes out the excess air in the outer cylinder 1 (the air squeezed out in this step is visible to the naked eye). When performing vacuum defoaming, use the sealing head 16 to block the outer Luer cone base and then operate according to the above steps.
[0031] In an optional embodiment, the outer surface of the finger wing 5 is engaged with a limiting clip 19, the top surface of which is used to limit the position of the quick-release clamp 17.
[0032] In this embodiment, when the hollow elastomer 7 is extruded by expansion, the position of the piston 2 needs to be kept still. First, the quick-release clamp 17 is locked to the surface of the push rod 3, and then it is fixed by the limit card 19 on the finger wing 5. The limit card 19 will engage and limit the quick-release clamp 17.
[0033] In an optional embodiment, an annular cavity 20 is provided on the inner side of the piston 2, and a through hole A21 communicating with the annular cavity 20 is opened at the bottom of the piston 2. An electric lead screw B22 is fixedly connected to the top surface of the annular cavity 20, and a rubber plug 23 that cooperates with the through hole A21 is fixedly connected to the end of the telescopic main shaft of the electric lead screw B22. The diameter of the through hole A21 is larger than the diameter of the telescopic main shaft of the electric lead screw B22. In its natural state, the rubber plug 23 is a frustum-shaped cone with a bottom diameter larger than a top diameter.
[0034] In this embodiment, the vacuum defoaming operation cannot rely solely on the negative pressure generated by the moving piston 2. Firstly, the vacuum level is insufficient, and secondly, the negative pressure decreases when air is expelled from the liquid additive. Therefore, a micro vacuum pump 26 is needed to actively perform vacuuming. During this process, the visible gas in the outer cylinder 1 needs to be expelled. Then, the outlet of the outer cylinder 1 is positioned downwards, and the piston 2 is moved upwards to prevent it from contacting the liquid additive. The vacuuming procedure is then executed via the electronic control component 12. The electronic control component 12 controls the operation of the micro vacuum pump 26 and the electric lead screw B22 by sending wireless signals. First, the electric lead screw B22 is activated, causing it to move the rubber stopper 23. The rubber stopper 23 moves downwards completely... After the through hole A21 is disengaged, the inner side of the outer cylinder 1 is connected to the annular cavity 20 through the through hole A21. Then, the micro vacuum pump 26 is started to perform vacuuming. The micro vacuum pump 26 needs to have an air negative pressure detection module. When the vacuum degree reaches -95kPa, the micro vacuum pump 26 stops working. When the vacuum degree reaches -93kPa, the micro vacuum pump 26 continues to work for more than one minute, generally not exceeding three minutes. After the time is up, first control the electric screw B22 to move and drive the rubber stopper 23 back to its original position. When the rubber stopper 23 returns, if there is residual liquid additive on the side of the rubber stopper 23, scrape off the liquid additive on the side of the rubber stopper 23 through the through hole A21. Then remove the limit card 19, disassemble the quick release clamp 17, and slowly return the push rod 3 by holding the push handle 4.
[0035] In an optional embodiment, a miniature vacuum pump 26 and a rechargeable battery 27 are fixedly connected to the top of the piston 2. The top of the piston 2 has a through hole B24 that connects the annular cavity 20 and the miniature vacuum pump 26. A one-way valve 25 is installed inside the through hole B24.
[0036] In this embodiment: the one-way valve 25 prevents external air from entering the annular cavity 20. The power of the micro vacuum pump 26 and the electric lead screw B22 is supplied by the rechargeable battery 27. When charging the rechargeable battery 27, the push rod 3 is pulled up to the highest position, and then the charging plug is inserted into the charging port 28 for charging. The limiting ring 29 prevents the piston 2 from entering the variable diameter part 6, which would cause damage to the piston 2.
[0037] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A micro-volume liquid additive mixing and dispensing device, comprising an outer cylinder (1) and a piston (2) movably sealed within the inner wall of the outer cylinder (1), wherein a push rod (3) is fixedly connected to the top of the piston (2), a push handle (4) is provided on the top of the push rod (3), and a finger wing (5) is provided on the outer side of the top opening of the outer cylinder (1), characterized in that: The bottom of the outer cylinder (1) is provided with a variable diameter section (6), which is set with a larger diameter at the top and a smaller diameter at the bottom. The large diameter end of the variable diameter section (6) is smoothly connected to the cylindrical section of the outer cylinder (1), and the small diameter end of the variable diameter section (6) is smoothly connected to the outer Luer cone base. A hollow elastomer (7) is provided inside the variable diameter section (6). The volume of the inner side of the hollow elastomer (7) is controlled by water injection. There is a gap between the hollow elastomer (7) and the inner wall of the variable diameter section (6) in the naturally contracted state. The hollow elastomer (7) in the liquid-filled expansion state is in contact with the inner wall surface of the variable diameter section (6).
2. The micro-volume liquid additive mixing and dispensing device according to claim 1, characterized in that: The top hardness and elasticity of the hollow elastomer (7) are greater than those of the sidewall and bottom of the hollow elastomer (7).
3. The micro-volume liquid additive mixing and dispensing device according to claim 1, characterized in that: The hollow elastomer (7) is able to move along the axis of the outer cylinder (1).
4. The micro-volume liquid additive mixing and dispensing device according to claim 1 or 3, characterized in that: The top of the hollow elastomer (7) is fixedly connected to a rigid water supply pipe (8) that communicates with it. The top of the rigid water supply pipe (8) is fixedly connected to a water storage shell (9). The inner side of the top of the water storage shell (9) is fixedly connected to an electric screw A (10). The end of the telescopic main shaft of the electric screw A (10) is fixedly connected to a plunger head (11). The outer side of the top of the water storage shell (9) is fixedly connected to an electric control assembly (12).
5. The micro-volume liquid additive mixing and dispensing device according to claim 4, characterized in that: A fixing plate (13) is inserted and fixed on the inner side of the top of the outer cylinder (1). A limiting groove (14) for sliding of the fixing plate (13) is opened on the side wall of the push rod (3). A threaded sleeve (15) is fixedly connected to one end of the fixing plate (13). An external thread that mates with the threaded sleeve (15) is provided on the top of the rigid water supply pipe (8).
6. The micro-volume liquid additive mixing and dispensing device according to claim 4, characterized in that: The electric screw A (10) controls the plunger head (11) to move and gradually increase the feed rate of water into the hollow elastomer (7).
7. The micro-volume liquid additive mixing and dispensing device according to claim 1, characterized in that: It also includes a plugging head (16) for sealing the outer Luer cone base, a quick-release clamp (17) is fitted on the outside of the push rod (3), and a gasket (18) is sandwiched between the quick-release clamp (17) and the syringe finger (5).
8. The micro-volume liquid additive mixing and dispensing device according to claim 7, characterized in that: The outer surface of the finger wing (5) is engaged with a limit card (19), and the top surface of the limit card (19) is used to limit the position of the quick-release clamp (17).
9. The micro-volume liquid additive mixing and dispensing device according to claim 1, characterized in that: The piston (2) has an annular cavity (20) on its inner side. The bottom of the piston (2) has a through hole A (21) that communicates with the annular cavity (20). An electric screw B (22) is fixedly connected to the top surface of the annular cavity (20). A rubber plug (23) that cooperates with the through hole A (21) is fixedly connected to the end of the telescopic main shaft of the electric screw B (22). The diameter of the through hole A (21) is larger than the diameter of the telescopic main shaft of the electric screw B (22). In its natural state, the rubber plug (23) is a frustum-shaped cone with a bottom diameter larger than a top diameter.
10. The micro-volume liquid additive mixing and dispensing device according to claim 9, characterized in that: A miniature vacuum pump (26) and a rechargeable battery (27) are fixedly connected to the top of the piston (2). A through hole B (24) is opened on the top of the piston (2) to connect the annular cavity (20) and the miniature vacuum pump (26). A one-way valve (25) is installed inside the through hole B (24).