A high-precision semi-automatic liquid dispensing device

Abstract

The utility model relates to a kind of high-precision semi-automatic liquid distribution device, it includes liquid distribution container, piston;The liquid distribution container is fixed volume container, its bottom side is equipped with liquid inlet, its bottom is equipped with liquid distribution port;The piston includes piston main body and piston handle, and with the sliding wall sealing connection in the liquid distribution container;The piston handle adopts hollow transparent structure, its top end is equipped with air hole, the air hole is detachably fixed with sealing cover, the piston handle bottom end side wall is sealingly fixed with the piston main body, floating ball is arranged in the piston handle cavity.The utility model has the effects of low cost, stable precision of split, air-tightness controllable.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a high-precision semi-automatic liquid dispensing device. Background Technology

[0002] Liquid filling machines are key equipment in chemical, food, pharmaceutical and laboratory fields. They mainly achieve quantitative filling of liquid materials through piston structure. Their explosion-proof design, automatic filling function and anti-drip characteristics ensure the stability and safety of production, and play an irreplaceable role in the quantitative filling process.

[0003] Currently, liquid dispensing equipment on the market is mainly divided into two categories: one is large-scale fully automatic filling equipment, which can meet the multi-dosage dispensing needs in large-scale production due to its high efficiency and precision; the other is simple semi-automatic dispensing device, which achieves basic dispensing through the principle of sealed bottles and air pressure, and is suitable for small-scale scenarios.

[0004] However, existing technologies have obvious drawbacks: large-scale fully automatic equipment, while highly accurate, is expensive to purchase, which is not only an excessive economic burden for small and medium-sized enterprises, but also easily leads to idle resources due to insufficient utilization; simple semi-automatic devices, while cheaper, rely on air pressure or peristalsis to control the dispensing volume, which is significantly affected by time and external environmental interference. Long-term use can easily lead to problems such as leakage and uneven dispensing, and they lack a built-in airtightness detection mechanism, making it difficult to monitor the sealing status in real time. This results in a decrease in volume accuracy after multiple dispensings, which cannot meet the stringent requirements for dispensing stability in fields such as biomedicine and diagnostic reagents. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a high-precision semi-automatic liquid dispensing device, which has the effects of low cost, stable dispensing accuracy and controllable air tightness.

[0006] The above-mentioned utility model objective is achieved through the following technical solution:

[0007] A high-precision semi-automatic liquid dispensing device includes a dispensing container and a piston;

[0008] The liquid dispensing container is a fixed-volume container with a liquid inlet on its bottom side and a liquid dispensing outlet at its bottom.

[0009] The piston includes a piston body and a piston handle, and is sealed to the sliding wall inside the liquid separator.

[0010] The piston handle has a hollow and transparent structure with an air hole at its top. The air hole is detachably and fixedly connected to a sealing cap. The bottom side wall of the piston handle is sealed and fixedly connected to the piston body. A floating ball is installed inside the piston handle cavity.

[0011] Through the above technical solution, the combination of a fixed-volume dispensing container and wear-resistant material eliminates the time and external interference errors of traditional methods, ensuring stable dispensing accuracy. The piston handle vent and sealing cap work together to achieve manual sealing control, balancing air pressure and dispensing thrust. A floating ball inside the hollow, transparent piston handle monitors airtightness in real time and provides a visual alarm, preventing leakage that could lead to volume deviation. The sliding seal between the piston body and the inner wall of the dispensing container prevents leakage and improves reliability. This device has a simple structure, is easy to operate, and is suitable for high-precision semi-automatic dispensing scenarios.

[0012] As a further technical solution of this utility model: the liquid inlet is connected to a first conduit, and the other end of the first conduit is connected to a liquid storage container.

[0013] The above technical solution connects the liquid inlet to the liquid storage container via a conduit, supporting batch liquid storage, reducing the frequency of manual liquid replenishment, preventing spillage, and improving the efficiency of continuous liquid separation and the practicality of batch liquid separation.

[0014] As a further technical solution of this utility model: the liquid distribution port is connected to a second conduit, and the second conduit is equipped with a check valve.

[0015] Through the above technical solution, a check valve is installed on the second conduit connected to the liquid separator, which can effectively prevent the liquid discharged from the liquid separator from flowing back due to pressure changes in the liquid separator container. This avoids backflowing liquid from contaminating the liquid in the liquid separator container or affecting the volume accuracy of the next liquid separation. The one-way flow characteristic of the check valve, combined with the air pressure control of the piston, ensures that the liquid can only be output in one direction after each liquid separation, further guaranteeing the accuracy and stability of the liquid volume of each liquid separation during continuous liquid separation and reducing operational errors caused by liquid backflow.

[0016] As a further technical solution of this utility model: the floating ball is a hollow red sphere made of polypropylene.

[0017] Through the above technical solution, the synergistic design of the floating ball's "hollow structure + polypropylene material + red appearance" allows for precise suspension and sensitive response. The hollow structure reduces density, ensuring that even slight changes in air pressure result in noticeable floating. The polypropylene material exhibits high environmental stability, resisting chemical corrosion and high temperatures, and remains undeformed and undamaged over long-term use. The red floating ball contrasts sharply with the transparent piston handle, facilitating rapid assessment of airtightness and enhancing visual monitoring. This reliably ensures dispensing accuracy, adapts to the needs of various applications, extends service life, and reduces maintenance costs.

[0018] As a further technical solution of this utility model: a hollow limiting plate is fixedly connected to the inner wall of the bottom end of the piston handle.

[0019] By using the above technical solution, a perforated limiting plate is set at the bottom of the internal cavity of the piston handle. This not only limits the falling range of the floating ball and prevents it from falling out of the visible area of ​​the piston handle and failing, but also maintains air pressure communication through the perforated structure, ensuring the floating ball's sensitive response to changes in air tightness, thereby improving the device's liquid separation accuracy, stability, and monitoring reliability.

[0020] In summary, this utility model has at least one of the following beneficial technical effects:

[0021] 1. This utility model discloses a high-precision semi-automatic liquid dispensing device, which achieves long-term stability of liquid dispensing accuracy and real-time visual monitoring of air tightness by cooperating a fixed volume dispensing container, a sealed piston and a transparent controllable air hole piston handle with a floating ball, thereby improving the operational reliability of the device.

[0022] 2. This utility model discloses a high-precision semi-automatic liquid dispensing device, whose inlet is connected to a first conduit and a liquid storage container to realize batch liquid storage, reduce the frequency of manual liquid addition, and improve the efficiency of continuous liquid dispensing.

[0023] 3. This utility model discloses a high-precision semi-automatic liquid dispensing device, which is equipped with a check valve through a second conduit connected to the dispensing port to prevent liquid backflow, avoid contamination and dispensing volume deviation, and ensure continuous dispensing accuracy. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of a high-precision semi-automatic liquid separation device according to the present invention.

[0025] Figure 2 This is a schematic diagram of the connection structure between a high-precision semi-automatic liquid dispensing device and a liquid storage container according to the present invention.

[0026] Figure 3 for Figure 1 Enlarged top view of the hollowed-out limiting plate.

[0027] Reference numerals: 1. Separating container; 11. Inlet; 12. Separating port; 2. Piston; 21. Piston body; 22. Piston handle; 221. Vent; 3. Sealing cap; 23. Floating ball; 4. Storage container; 5. First conduit; 6. Second conduit; 7. Check valve; 8. Hollowed-out limiting plate; 81. Vent. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] Reference Figure 1 This utility model discloses a high-precision semi-automatic liquid dispensing device, which includes a liquid dispensing container 1 and a piston 2.

[0032] Reference Figure 1 The dispensing container 1 adopts a fixed volume design, and its volume value precisely corresponds to the target dispensing amount. It is made of wear-resistant materials such as polytetrafluoroethylene or medical stainless steel to resist the corrosion of corrosive liquids. The bottom side has a liquid inlet 11 through a threaded sealing interface, and the bottom center has a dispensing port 12 with a conical groove structure to form a low-resistance directional fluid channel. Furthermore, anti-corrosion sealing bushings are added at the interfaces of the liquid inlet 11 and the dispensing port 12 to enhance the sealing performance.

[0033] Reference Figure 2The inlet 11 has an external threaded connector at its outer end. One end of the first conduit 5 is fitted with a fastening connector with an internal thread, which is screwed onto the inlet 11 to fix it. A sealing ring is embedded inside the connector to prevent liquid leakage. The outlet at the bottom of the storage container 4 has an external threaded connector of the same specification, and the other end of the first conduit 5 is connected to it in the same way, thus forming a continuous liquid channel from the storage container 4 to the distribution container 1, reducing the frequency of manual liquid addition. The distribution port 12 also has an external threaded connector at its outer end. One end of the second conduit 6 is screwed onto it to fix it through a sealing connector with an internal thread. The inner sealing ring ensures that the liquid does not leak out during distribution. The check valve 7 is connected in series in the second conduit 6. Its two ends are adapted to the conduit. The inlet end is connected to the conduit section near the distribution port 12, and the outlet end is connected to the other end of the conduit. It only allows liquid to flow unidirectionally from the distribution port 12 to the outside, avoiding backflow contamination or affecting the distribution accuracy.

[0034] Reference Figure 1 The piston body 21 and the bottom of the piston handle 22 are fixedly connected by an integral molding process to ensure synchronous movement under force to maintain sealing performance. The piston handle 22 is a hollow transparent structure. The top of the piston handle 22 has an opening for an air hole 221. The air hole 221 and the sealing cover 3 are detachably fixedly connected by threaded engagement or hinged rotation. The opening and closing state of the air hole 221 can be switched by rotating the sealing cover 3. In addition, a silicone gasket is provided at the connection between the sealing cover 3 and the air hole 221 to seal the air hole 221.

[0035] Reference Figure 1 A perforated limiting plate 8 is fixedly connected to the inner wall of the bottom of the internal cavity of the piston handle 22. The perforated limiting plate 8 is made of a circular polypropylene sheet that matches the inner diameter of the piston handle 22. (Refer to...) Figure 3 The perforated limiting plate 8 has multiple vent holes 81 evenly distributed on its surface. The diameter of the vent holes 81 is smaller than the diameter of the floating ball 23 (preferably ≤ 1 / 3 of the ball diameter), which can prevent the floating ball 23 from leaking out of the vent holes 81 or getting stuck, ensuring that it floats normally in the cavity of the piston handle 22 to achieve the airtightness detection function. At the same time, the total area of ​​the vent holes 81 is not less than 30% of the cross-sectional area of ​​the piston handle 22, which can ensure air pressure communication and allow the air pressure change generated by the movement of the piston 2 during liquid separation to be quickly transmitted to the floating ball 23, achieving a balance between air pressure transmission efficiency and limiting reliability.

[0036] The floating ball 23 is a red hollow sphere made of polypropylene, which is freely placed in the cavity of the piston handle 22 above the hollow limiting plate 8. The inner wall of the piston handle 22 cavity is smooth and its axial length is adapted to the range of motion of the floating ball 23, which allows it to float freely with changes in air pressure, while the hollow limiting plate 8 prevents it from falling off. Thus, the airtightness of the device is monitored in real time by linking buoyancy and air pressure.

[0037] With the above structure, the fixed volume dispensing container 1 can ensure a stable volume of liquid each time. The sealing connection of the piston 2 and the sealing cover 3 of the air hole 221 cooperate to achieve air pressure control. The floating ball 23 in the transparent piston handle 22 can reflect the air tightness in real time. The liquid storage container 4 and the conduit cooperate to improve the continuous dispensing efficiency. The check valve 7 ensures the dispensing accuracy. Together, they constitute a low-cost, high-precision semi-automatic dispensing system.

[0038] The working process of this utility model is as follows: a high-precision semi-automatic liquid separation device.

[0039] Step 1: Assembly of the device

[0040] Connect the liquid separator 1) to the first conduit 5 through the liquid inlet 11, and connect the other end of the first conduit 5 to the liquid storage container 4; connect the liquid separator 12 of the liquid separator 1 to the second conduit 6, and ensure that the check valve 7 in the second conduit 6 is installed in place; slide and seal the piston body 21 of the piston 2 to the inner wall of the liquid separator 1, do not install the sealing cap 3 on the air hole 221 at the top of the piston handle 22, and put the red floating ball 23 into the cavity inside the piston handle 22, with its bottom supported by the hollow limiting plate 8.

[0041] Step 2: Solution Addition and Initial State Setting

[0042] Add the liquid to be dispensed into the storage container 4, open the vent 221 at the top of the piston handle 22 (without covering the sealing cap), and pull the piston 2 upwards to the top to maximize the internal space of the dispensing container 1. At this time, the liquid flows naturally into the dispensing container 1 through the storage container 4, the first conduit 5, and the inlet 11 until the entire dispensing container 1 and the connecting pipes are filled, completing the initial filling.

[0043] Step 3: Air tightness verification

[0044] Close the sealing cap 3 and shut off the vent 221. Observe the state of the red floating ball 23 inside the piston handle 22: If the floating ball 23 moves up and down with the change of internal air pressure when the piston 2 is pushed or pulled slightly, it indicates that the device is airtight. If the floating ball 23 does not move significantly, the sealing parts (such as the piston body 21 and the inner wall of the liquid separator 1, the connection of each conduit, etc.) need to be checked to ensure that the airtightness is qualified.

[0045] Step 4: Single-stage separation operation

[0046] After confirming airtightness, the piston body 21 of piston 2 is pushed downwards, increasing the pressure inside the liquid distribution container 1. The check valve 7 opens, and liquid flows out through the liquid distribution port 12 and the second conduit 6 until the piston body 21 is pushed to the bottom of the liquid distribution container 1. Since the liquid distribution container 1 has a fixed volume, the volume of liquid flowing out at this time is a preset fixed value, completing one high-precision liquid distribution.

[0047] Step 5: Continuous separation operation

[0048] After a single liquid separation, pull the piston body 21 of piston 2 upward: the pressure in the liquid separation container 1 decreases, the check valve 7 in the second conduit 6 closes, and the liquid in the storage container 4 flows back into the liquid separation container 1 through the first conduit 5 and the inlet 11 until it is full; repeat the pushing operation in step four to achieve continuous liquid separation multiple times.

[0049] Step Six: Real-time monitoring of airtightness

[0050] During continuous liquid separation, the airtightness can be monitored in real time by observing the state of the red floating ball 23 inside the piston handle 22: each time the piston 2 is pushed or pulled, the floating ball 23 moves stably with the change of air pressure, indicating that the airtightness is always good and ensuring the accuracy of the liquid separation volume; if the floating ball 23 is in an abnormal state (such as not moving or moving erratically), the operation must be stopped immediately, the air hole 221 must be opened to check and repair the airtightness before continuing.

[0051] The implementation principle of this utility model is as follows: A wear-resistant liquid dispensing container 1 with a fixed volume is used as the core. Its constant volume ensures accurate liquid dispensing each time, unaffected by external factors. A piston 2 achieves pressurized dispensing through pushing and pulling. Its piston handle 22 is a hollow, transparent structure containing a red floating ball 23. When the air vent 221 is closed, the floating ball 23 moves with changes in internal air pressure, indicating the device's airtightness in real time. A check valve 7 in the second conduit 6 prevents liquid backflow, ensuring the airtightness of the dispensing container 1 and allowing the liquid in the storage container 4 to refill the dispensing container 1 when the piston 2 is pulled, achieving continuous and stable dispensing. All components work together to achieve high-precision semi-automatic dispensing at low cost.

[0052] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A high-precision semi-automatic liquid dispensing device, characterized in that, Includes a liquid separator (1) and a piston (2); The liquid distribution container (1) is a fixed volume container made of wear-resistant material, with an inlet (11) on the bottom side and a liquid distribution port (12) at the bottom. The piston (2) includes a piston body (21) and a piston handle (22), and the piston body (21) is slidably and sealingly connected to the inner wall of the liquid separator (1); The piston handle (22) adopts a hollow transparent structure, and an air hole (221) is provided at its top. The air hole (221) is detachably and fixedly connected to a sealing cap (3). The bottom side wall of the piston handle (22) is sealed and fixedly connected to the piston body (21). A floating ball (23) is provided in the cavity of the piston handle (22).

2. The high-precision semi-automatic liquid dispensing device according to claim 1, characterized in that, The inlet (11) is connected to a first conduit (5), and the other end of the first conduit (5) is connected to a liquid storage container (4).

3. The high-precision semi-automatic liquid dispensing device according to claim 1, characterized in that, The liquid outlet (12) is connected to a second conduit (6), and the second conduit (6) is equipped with a check valve (7).

4. The high-precision semi-automatic liquid dispensing device according to claim 1, characterized in that, The floating ball (23) is a red hollow sphere made of polypropylene.

5. A high-precision semi-automatic liquid dispensing device according to claim 1, characterized in that, A hollow limiting plate (8) is fixedly connected to the inner wall of the bottom end of the piston handle (22).

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