Quantitative liquid feeding device

Abstract

The utility model relates to a liquid quantitative feeding device which comprises a charging barrel, a transverse partition plate is fixedly installed in the middle of the interior of the charging barrel and used for completely sealing the bottom end of the interior of the charging barrel, a positioning hole vertically penetrating through the transverse partition plate is formed in the center of the top of the transverse partition plate, and the bottom end of a push rod is installed in the positioning hole in a sliding mode. The top end of the push rod is connected with a driving part of a linear driving motor, the linear driving motor is fixedly installed at the inner top end of the charging barrel, the bottom end of the push rod is located in the inner bottom end space of the charging barrel, an extrusion plate is fixedly installed at the bottom end of the push rod, the periphery of the extrusion plate is sleeved with a sealing ring, and the periphery of the extrusion plate is attached to the inner wall of the charging barrel; a discharging opening is formed in the center of the inner bottom of the charging barrel and communicates with one end of a feeding pipe, liquid is filled in the space of the inner bottom end of the charging barrel, then the device is inverted, a linear driving motor pushes a push rod to move upwards, materials are squeezed into the feeding pipe, and therefore high-precision quantitative feeding is achieved.

Description

Technical Field

[0001] This utility model relates to the field of feeding device technology, and in particular to a liquid quantitative feeding device. Background Technology

[0002] In the fields of fine chemicals, biopharmaceuticals, and food additives, the precise quantitative dispensing of liquid materials is directly related to product quality and process stability. Traditional volumetric metering devices (such as plunger pumps and gear pumps) rely on mechanical transmission structures, which have two core drawbacks: First, hydraulic or pneumatic drive systems are significantly affected by changes in medium viscosity and pipeline pressure fluctuations, resulting in output accuracy deviations often exceeding ±5%, making it difficult to meet micro-level quantitative requirements; second, mechanical seal structures are prone to wear and leakage during repeated movements, especially for corrosive solvents or high-purity raw materials, where even minor leaks not only cause material loss but may also lead to cross-contamination risks. For example, while existing pneumatic quantitative filling valves achieve metering through pneumatically driven pistons, cylinder response delays and gas compressibility cause the final discharge volume to drift with changes in back pressure, resulting in batch-to-batch variations in continuous production. Furthermore, existing devices generally employ a positive pressure storage silo design. When processing volatile or high-viscosity liquids, the residual liquid film on the inner wall of the silo cannot be completely discharged due to gravity, resulting in a residue rate as high as 3%-8%. This not only wastes raw materials but also complicates the material replacement and cleaning process. Therefore, there is an urgent need for a new quantitative technology that can achieve milliliter-level accuracy, low residue rate, and adaptability to complex physical properties.

[0003] With the development of emerging fields such as nanomaterial synthesis and cell culture medium preparation, the demand for high-precision delivery of micro-volume liquids (0.1-10 mL) has surged. Existing solutions, such as peristaltic pumps, can achieve micro-volume control, but fatigue deformation of the tubing leads to long-term accuracy degradation; while precision injection pumps are limited by the single filling volume, requiring frequent interruptions to replenish the process. Existing servo-driven quantitative dispensing devices attempt to improve accuracy through linear motors, but their upright barrel structure presents a key contradiction: the push rod must penetrate the bottom sealing surface of the barrel for compression, and the dynamic sealing interface will inevitably generate micro-gaps under long-term friction. When the device is inverted (such as when injecting into the top of a reactor), the risk of seal failure increases, which can lead to leakage and equipment contamination, or even solvent vapor explosion. More seriously, micro-volume liquids are prone to forming stagnant droplets in the delivery tube due to surface tension, requiring traditional pulse flushing methods to consume an additional 5-10 times the amount of flushing fluid, which violates the principle of cost reduction in fine chemicals. Current technology has not yet effectively integrated three core capabilities: compatibility between large-capacity storage and low-volume output, zero-leakage sealing reliability under inverted operating conditions, and fluid dynamics design for ultra-low residue delivery. This has become a key bottleneck restricting the upgrading of high-end manufacturing processes and highlights the urgency of developing innovative quantitative architectures. Utility Model Content

[0004] The purpose of this invention is to provide a liquid quantitative feeding device to solve the problems existing in the prior art.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A liquid metering feeding device includes a material cylinder. A horizontal partition is fixedly installed in the middle of the inside of the material cylinder, which completely seals the bottom of the inside of the material cylinder. A positioning hole penetrating the top of the horizontal partition is provided at the center of the top of the horizontal partition. The bottom end of a push rod is slidably installed in the positioning hole. The top end of the push rod is connected to the drive unit of a linear drive motor. The linear drive motor is fixedly installed at the top of the inside of the material cylinder. The bottom end of the push rod is located in the bottom space of the inside of the material cylinder. An extrusion plate is fixedly installed at the bottom end of the push rod. A sealing ring is sleeved around the periphery of the extrusion plate. The periphery of the extrusion plate is in contact with the inner wall of the material cylinder. A discharge port is provided at the center of the bottom of the material cylinder. One end of the discharge port is connected to a feed pipe. A one-way discharge valve is provided at the end of the feed pipe connected to the discharge port.

[0007] By adopting the above technical solution, the liquid is filled into the space at the bottom of the device. Then, by inverting the device, the linear drive motor pushes the push rod upward to squeeze the material into the feeding pipe. Because the linear drive motor itself has higher precision than hydraulic cylinders and air cylinders, high-precision quantitative feeding can be achieved.

[0008] In a further embodiment, an O-ring is fixedly installed in a positioning hole at the intersection of the push rod and the transverse partition.

[0009] By adopting the above technical solution, it is possible to prevent liquid leakage when the device is used upside down, so that the liquid flows directly out from the gap between the positioning hole and the push rod.

[0010] In a further embodiment, the inner top of the barrel is designed with a material level gauge for use with a linear drive motor, the material level gauge being used to indicate the amount of material remaining in the bottom space of the barrel.

[0011] In a further embodiment, the middle section of the feed pipe is connected to an air pipe, which is used to supply high-pressure airflow to the inside of the feed pipe to drive the liquid inside the feed pipe to flow out at high speed.

[0012] By adopting the above technical solution, the air pipe can be quickly delivered to the end of the feed pipe even if the amount of liquid entering the feed pipe is small.

[0013] In a further embodiment, the material cylinder is a cylindrical material cylinder.

[0014] By adopting the above technical solutions, it is easier to control and prevent leaks.

[0015] In a further embodiment, the top of the diaphragm is provided with reinforcing ribs to increase the strength of the diaphragm.

[0016] In summary, this utility model has the following beneficial effects:

[0017] 1. By filling the liquid into the space at the bottom of the chamber, and then by inverting the device, the linear drive motor pushes the push rod upward to squeeze the material into the feeding tube. Because the linear drive motor itself has higher precision than hydraulic cylinders and air cylinders, it can achieve a high-precision quantitative feeding effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the material cylinder used to illustrate this utility model.

[0020] In the diagram, 1 is the material cylinder; 2 is the horizontal partition; 3 is the push rod; 4 is the linear drive motor; 5 is the extrusion plate; and 6 is the air pipe. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings.

[0022] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the attached figures. Figure 1 In this specification, the terms "bottom surface" and "top surface," "inner" and "outer" refer to the direction toward or away from the geometry of a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "a plurality of" means two or more, unless otherwise explicitly and specifically defined by the direction of the center.

[0023] Example 1:

[0024] like Figures 1-2As shown, the liquid metering feeding device includes a cylinder 1. A horizontal partition 2 is fixedly installed in the middle of the cylinder 1, which completely seals the bottom of the cylinder 1. A positioning hole penetrating the top of the partition 2 is provided at the center of the top of the partition 2. The bottom end of a push rod 3 is slidably installed in the positioning hole. The top of the push rod 3 is connected to the drive unit of a linear drive motor 4. The linear drive motor 4 is fixedly installed in the top of the cylinder 1. The bottom end of the push rod 3 is located in the bottom space of the cylinder 1. An extrusion plate 5 is fixedly installed at the bottom end of the push rod 3. A sealing ring is fitted around the periphery of the extrusion plate 5. The periphery of the extrusion plate 5 is in contact with the inner wall of the cylinder 1. A discharge port is located at the center of the inner bottom of the feed tube, which is connected to one end of the feed tube. A one-way discharge valve is installed at the end of the feed tube connected to the discharge port. An O-ring is fixedly installed in the positioning hole at the intersection of the push rod 3 and the transverse partition 2. An air pipe 6 is connected to the middle section of the feed tube. The air pipe 6 is used to supply high-pressure airflow to the inside of the feed tube to drive the liquid inside the feed tube to flow out at high speed. The feed tube 1 is a cylindrical feed tube 1. A reinforcing rib is provided at the top of the transverse partition 2 to increase the strength of the transverse partition 2.

[0025] Specific implementation process: The liquid is filled into the space at the bottom of the device. Then, by inverting the device, the linear drive motor pushes the push rod upward to squeeze the material into the feeding tube. Because the linear drive motor itself has higher precision than hydraulic cylinders and air cylinders, it can achieve high-precision quantitative feeding and avoid leakage when the device is inverted, so that the liquid flows out directly from the gap between the positioning hole and the push rod.

[0026] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0027] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A liquid dosing device, characterized in that: The material includes a barrel (1), a horizontal partition (2) is fixedly installed in the middle of the barrel (1), the horizontal partition (2) is used to completely seal the bottom of the barrel (1), a positioning hole is provided at the top center of the horizontal partition (2) and passes through the horizontal partition (2), the bottom end of a push rod (3) is slidably installed in the positioning hole, the top end of the push rod (3) is connected to the drive part of a linear drive motor (4), the linear drive motor (4) is fixedly installed at the top of the barrel (1), the bottom end of the push rod (3) is located in the bottom space of the barrel (1), the bottom end of the push rod (3) is fixedly installed with an extrusion plate (5), a sealing ring is sleeved on the periphery of the extrusion plate (5), the periphery of the extrusion plate (5) is in contact with the inner wall of the barrel (1), a discharge port is provided at the bottom center of the barrel (1), the discharge port is connected to one end of a feed pipe, and a one-way discharge valve is provided at the end of the feed pipe connected to the discharge port.

2. The liquid dosing device according to claim 1, characterized in that An O-ring is fixedly installed in the positioning hole at the intersection of the push rod (3) and the cross plate (2).

3. The liquid dosing device according to claim 1, characterized in that: The middle section of the feed pipe is connected to an air pipe (6), which is used to supply high-pressure airflow to the inside of the feed pipe to drive the liquid inside the feed pipe to flow out at high speed.

4. The liquid dosing device according to claim 1, characterized in that: The middle section of the feed pipe is connected to an air pipe (6), which is used to supply high-pressure airflow to the inside of the feed pipe to drive the liquid inside the feed pipe to flow out at high speed.

5. The liquid dosing device according to claim 1, characterized in that: The material cylinder (1) is a cylindrical material cylinder (1).

6. The liquid dosing device according to claim 1, characterized in that: The top of the diaphragm (2) is provided with reinforcing ribs, which are used to increase the strength of the diaphragm (2).

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