Closed small-batch quantitative feeding system

Abstract

The utility model discloses a closed small-batch quantitative feeding system which comprises a plurality of raw material barrels, a metering tank, a stirring reactor and a nitrogen system, the raw material barrels are communicated with the metering tank through a nitrogen inlet switch valve, a multi-way valve is arranged at the bottom of the metering tank to be connected with the reactor, and a material returning multi-way valve is arranged to form a closed-loop backflow path. The liquid level meter monitors the material volume in real time, and the nitrogen system achieves material conveying and backflow calibration through pressure adjustment. During working, nitrogen drives raw materials to be pressed into the metering tank, and the liquidometer triggers the valve to be closed to achieve accurate metering; redundant materials return to the raw material barrel through the return valve, and overshoot errors are eliminated; and finally injecting the material into the reactor under nitrogen pressure. The system solves the problems of potential safety hazards, insufficient precision and low efficiency of a traditional process through a closed structure, nitrogen protection and automatic control, remarkably improves the production safety and the automation level, and is suitable for refined production scenes of high-purity chemicals.

Description

Technical Field

[0001] This utility model relates to the field of small-batch intermittent fine chemical technology, specifically to a closed-loop small-batch quantitative feeding system. Background Technology

[0002] In the field of fine chemicals, small-batch intermittent fine chemical processing involves a large number of chemical liquefaction materials, small batch addition amounts, and many process variations.

[0003] Currently, small-batch intermittent production processes generally suffer from safety and efficiency bottlenecks in the material addition process. Existing technologies rely on manual weighing and manual feeding to add trace amounts of chemical raw materials. Since many chemical materials are volatile, toxic, or corrosive, open manual transfer processes can easily lead to gas escape, resulting in a deteriorated working environment and threatening occupational health. Furthermore, manual weighing is limited by operator experience and equipment sensitivity, making it difficult to guarantee measurement accuracy, with error rates often reaching ±3%-5%, directly affecting product formulation stability and batch consistency. In addition, when multiple materials are added alternately, residual materials can easily cause cross-contamination through open containers or tools, especially in high-purity scenarios such as pharmaceutical intermediates. Traditional processes lack integrated control systems, requiring frequent valve opening and closing and pipeline switching, leading to low production efficiency and an increased probability of human error. Flammable and explosive materials also pose safety hazards such as static electricity accumulation and friction sparks when handled in non-enclosed environments.

[0004] Therefore, there is an urgent need for a feeding system that can achieve a closed, automated, and precise feeding process to improve production safety, reduce occupational hazards, and meet the stringent requirements of high-end chemical manufacturing. Utility Model Content

[0005] The purpose of this invention is to provide a closed-loop small-batch quantitative feeding system. Through a closed structure and nitrogen pressure conveying technology, it solves the problems of material volatilization, large feeding errors, easy cross-contamination, and poor safety in traditional manual feeding.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a closed small-batch quantitative feeding system, including a first raw material tank, a second raw material tank, a third raw material tank, a fourth raw material tank, a metering tank, a first stirring reactor, and a second stirring reactor;

[0007] The first raw material tank, the second raw material tank, the third raw material tank, and the fourth raw material tank are respectively connected to the metering tank through the first nitrogen inlet switch valve, the second nitrogen inlet switch valve, the third nitrogen inlet switch valve, and the fourth nitrogen inlet switch valve; the bottom of the metering tank is respectively connected to the first stirring reactor and the second stirring reactor through the second discharge multi-way valve and the third discharge multi-way valve; the bottom of the metering tank is connected to the return multi-way valve through the first discharge multi-way valve.

[0008] As a preferred embodiment of a closed-loop small-batch quantitative feeding system, the return multi-way valve includes: a first return multi-way valve, a second return multi-way valve, a third return multi-way valve, and a fourth return multi-way valve; the first return multi-way valve, the second return multi-way valve, the third return multi-way valve, and the fourth return multi-way valve are respectively connected to the first raw material tank, the second raw material tank, the third raw material tank, and the fourth raw material tank.

[0009] As a preferred embodiment of a closed-loop small-batch quantitative feeding system, the metering tank is equipped with a level gauge; the level gauge is used to measure the volume of chemical materials in the metering tank in real time.

[0010] As a preferred embodiment of a closed-loop small-batch quantitative feeding system, a nitrogen inlet switch valve is provided above the metering tank; the nitrogen inlet switch valve is used to control the amount of nitrogen entering the metering tank.

[0011] As a preferred embodiment of a closed-loop small-batch quantitative feeding system, the metering tank is equipped with a metering tank exhaust valve at the top; the metering tank exhaust valve is used to discharge nitrogen gas from the metering tank.

[0012] As a preferred embodiment of a closed-loop small-batch quantitative feeding system, the first raw material tank, the second raw material tank, the third raw material tank, and the fourth raw material tank are respectively equipped with a first raw material tank exhaust valve, a second raw material tank exhaust valve, a third raw material tank exhaust valve, and a fourth raw material tank exhaust valve; the first raw material tank exhaust valve, the second raw material tank exhaust valve, the third raw material tank exhaust valve, and the fourth raw material tank exhaust valve are respectively used to discharge nitrogen from the first raw material tank, the second raw material tank, the third raw material tank, and the fourth raw material tank.

[0013] The beneficial effects of this utility model are as follows:

[0014] First, it addresses the issues of material volatilization and occupational hazards: through a closed structure and nitrogen pressure conveying technology, it effectively isolates chemical materials from the outside environment, reduces the escape of volatile gases, significantly improves the working environment, and reduces occupational health risks.

[0015] Second, improve metering accuracy: real-time monitoring with a level gauge and precise control with nitrogen pressure are adopted to achieve independent quantitative addition of multiple materials, with the error rate controlled within ±1%, ensuring the stability of product ratio.

[0016] Third, eliminate cross-contamination: the reflux pipeline and multi-way valve linkage design avoid material residue and accidental addition, which is especially suitable for the fine production scenarios of high-purity chemicals.

[0017] Fourth, improve automation efficiency: Full-process automated control reduces human intervention, shortens the feeding time of a single batch to within 5 minutes, greatly improves production efficiency and reduces the risk of misoperation.

[0018] Fifth, enhanced safety: nitrogen replacement and explosion-proof design eliminate flammable and explosive hazards, and the electrostatic protection mechanism effectively avoids ignition sources, ensuring inherent safety in the production process. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0021] Figure 1 This is a schematic diagram of a closed-loop small-batch quantitative feeding system provided in an embodiment of this utility model.

[0022] In the diagram, 1-1, first raw material tank; 1-2, second raw material tank; 1-3, third raw material tank; 1-4, fourth raw material tank; 2-1, first nitrogen inlet switch valve; 2-2, second nitrogen inlet switch valve; 2-3, third nitrogen inlet switch valve; 2-4, fourth nitrogen inlet switch valve; 3-1, first raw material tank exhaust valve; 3-2, second raw material tank exhaust valve; 3-3, third raw material tank exhaust valve; 3-4, fourth raw material tank exhaust valve; 4, metering tank exhaust valve; 5, metering tank; 6, level gauge; 7-1, first discharge multi-way valve; 7-2, second discharge multi-way valve; 7-3, third discharge multi-way valve; 8-1, first return multi-way valve; 8-2, second return multi-way valve; 8-3, third return multi-way valve; 8-4, fourth return multi-way valve; 9, metering tank nitrogen inlet switch valve; 10, first stirred reactor; 11, second stirred reactor. Detailed Implementation

[0023] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0025] See Figure 1 This utility model provides a closed-loop small-batch quantitative feeding system, including a first raw material tank 1-1, a second raw material tank 1-2, a third raw material tank 1-3, a fourth raw material tank 1-4, a metering tank 5, a first stirring reactor 10, and a second stirring reactor 11;

[0026] The first raw material tank 1-1, the second raw material tank 1-2, the third raw material tank 1-3, and the fourth raw material tank 1-4 are respectively connected to the metering tank 5 through the first nitrogen inlet switch valve 2-1, the second nitrogen inlet switch valve 2-2, the third nitrogen inlet switch valve 2-3, and the fourth nitrogen inlet switch valve 2-4; the bottom of the metering tank 5 is respectively connected to the first stirred reactor 10 and the second stirred reactor 11 through the second discharge multi-way valve 7-2 and the third discharge multi-way valve 7-3; the bottom of the metering tank 5 is connected to the return multi-way valve through the first discharge multi-way valve 7-1.

[0027] Specifically, four raw material tanks—Raw Material Tank 1-1, Raw Material Tank 1-2, Raw Material Tank 1-3, and Raw Material Tank 1-4—are connected to metering tank 5 via independent nitrogen inlet valves 2-1, 2-2, 2-3, and 2-4, respectively. Each raw material tank is equipped with an independent valve, forming a one-to-one air inlet channel. In practical applications, the number of raw material tanks and nitrogen inlet valves can be set according to actual usage conditions to ensure a one-to-one correspondence. Similarly, the number of stirred reactors can also be set according to actual usage requirements.

[0028] When the first nitrogen inlet valve 2-1 of the first raw material tank 1-1 is opened, nitrogen gas enters the first raw material tank 1-1 through the valve body, forming an internal positive pressure, which pushes the material in the tank into the metering tank 5 along the feed branch pipe. The nitrogen inlet valve can be opened and closed independently, supporting alternating or parallel feeding of multiple raw material tanks (such as adding two materials to the metering tank at the same time), adapting to the needs of small-batch, multi-variety production.

[0029] The bottom of the metering tank 5 is connected to the first stirred reactor 10 and the second stirred reactor 11 via the second discharge multi-way valve 7-2 and the third discharge multi-way valve 7-3, respectively, to distribute the material in the metering tank 5 to the different reactors as needed. At the same time, the bottom of the metering tank 5 is connected to the return multi-way valve via the first discharge multi-way valve 7-1, forming a material return path.

[0030] In one possible embodiment, the return multi-way valve includes: a first return multi-way valve 8-1, a second return multi-way valve 8-2, a third return multi-way valve 8-3, and a fourth return multi-way valve 8-4; the first return multi-way valve 8-1, the second return multi-way valve 8-2, the third return multi-way valve 8-3, and the fourth return multi-way valve 8-4 are respectively connected to the first raw material tank 1-1, the second raw material tank 1-2, the third raw material tank 1-3, and the fourth raw material tank 1-4.

[0031] Specifically, the first return multi-way valve 8-1 is connected to the first raw material tank 1-1; the second return multi-way valve 8-2 is connected to the second raw material tank 1-2; the third return multi-way valve 8-3 is connected to the third raw material tank 1-3; and the fourth return multi-way valve 8-4 is connected to the fourth raw material tank 1-4. Each return multi-way valve corresponds to a raw material tank, creating an independent channel. Excess material in the metering tank 5 is precisely returned to the corresponding raw material tank through the corresponding return multi-way valve, preventing residue contamination of the next batch of material. Simultaneously, by returning excess material to the raw material tank, the accuracy of the single feeding amount is ensured, with a single feeding error ≤ ±1%.

[0032] In one possible embodiment, the metering tank 5 is equipped with a level gauge 6; the level gauge 6 is used to measure the volume of chemical materials in the metering tank 5 in real time.

[0033] Specifically, metering tank 5 serves as the central storage and distribution hub for materials, and a level gauge 6 is installed inside to monitor the material volume in real time. When nitrogen pressure forces the raw material into the metering tank, the level gauge 6 dynamically feeds back the level data. When the preset value (e.g., 100L) is reached, the corresponding nitrogen inlet valve is closed, stopping the feeding.

[0034] Among them, the level gauge 6 adopts non-contact sensing technology (such as ultrasonic or float type) to provide real-time feedback on the liquid level in the tank. Combined with the preset volume-liquid level correspondence table, it realizes the quantitative accuracy calibration of materials and eliminates human visual error.

[0035] In one possible embodiment, a nitrogen inlet switch valve 9 is provided above the metering tank 5; the nitrogen inlet switch valve 9 is used to control the amount of nitrogen entering the metering tank 5.

[0036] Specifically, the nitrogen inlet switch valve 9 of the metering tank balances the material conveying speed and the pressure inside the metering tank 5 by adjusting the nitrogen flow rate and pressure, preventing material splashing or pipe bursting due to excessive pressure, while maintaining a sealed environment to prevent oxidation.

[0037] In one possible embodiment, the metering tank 5 is provided with a metering tank exhaust valve 4 at the top; the metering tank exhaust valve 4 is used to discharge nitrogen gas from the metering tank 5.

[0038] Specifically, the metering tank exhaust valve 4 opens after feeding is completed to release the residual nitrogen pressure inside the metering tank 5, preventing difficulties in the next feeding due to pressure differences. The metering tank exhaust valve 4 is a one-way valve design to prevent backflow of outside air and maintain the inert gas protection state inside the tank.

[0039] In one possible embodiment, the first raw material tank 1-1, the second raw material tank 1-2, the third raw material tank 1-3, and the fourth raw material tank 1-4 are respectively provided with a first raw material tank exhaust valve 3-1, a second raw material tank exhaust valve 3-2, a third raw material tank exhaust valve 3-3, and a fourth raw material tank exhaust valve 3-4; the first raw material tank exhaust valve 3-1, the second raw material tank exhaust valve 3-2, the third raw material tank exhaust valve 3-3, and the fourth raw material tank exhaust valve 3-4 are respectively used to discharge nitrogen gas from the first raw material tank 1-1, the second raw material tank 1-2, the third raw material tank 1-3, and the fourth raw material tank 1-4.

[0040] Specifically, the first raw material tank 1-1, the second raw material tank 1-2, the third raw material tank 1-3, and the fourth raw material tank 1-4 are all equipped with exhaust pipes; each exhaust pipe is equipped with a corresponding exhaust valve 3-1 for the first raw material tank, 3-2 for the second raw material tank, 3-3 for the third raw material tank, and 3-4 for the fourth raw material tank. Before feeding, the corresponding exhaust valve of the target raw material tank is opened to quickly expel the nitrogen from the target raw material tank, ensuring thorough nitrogen replacement. Simultaneously, independent control of the raw material tanks via their exhaust valves avoids system pressure fluctuations caused by simultaneous depressurization of multiple tanks.

[0041] In one possible embodiment, taking the addition of chemical material A as an example, before automatically adding chemical material A according to the control system settings, all switching valves are closed. First, the metering tank exhaust valve 4 is opened, and then the first nitrogen inlet valve 2-1 of the first raw material tank 1-1 is opened. The nitrogen pressure forces chemical material A into the metering tank 5. The level gauge 6 in the metering tank 5 measures the volume of chemical material A in the metering tank 5 in real time. When the level gauge 6 reaches the required amount, the first nitrogen inlet valve 2-1 of the first raw material tank 1-1 is closed, stopping the addition of chemical material A. To ensure accurate material quantity, the first raw material tank exhaust valve 3-1 needs to be opened, followed by slowly opening the first discharge multi-way valve 7-1 and the first return multi-way valve 8-1 to return excess chemical material A back to the first raw material tank 1-1. When the level gauge 6 accurately measures the required amount, the first discharge multi-way valve 7-1 is closed first, and the first return multi-way valve 8-1 and the first raw material tank exhaust valve 3-1 are closed with a delay. Finally, open the second discharge multi-way valve 7-2 to add a quantitative amount of chemical material A into the first stirred reactor 10.

[0042] The working principle of this utility model is as follows:

[0043] First, the feeding stage: Select the target raw material tank, such as the first raw material tank 1-1, and open the corresponding first nitrogen inlet switch valve 2-1 and the metering tank exhaust valve 4. Nitrogen enters the raw material tank, creating positive pressure and pushing the material along the feed branch pipe into the metering tank 5. The nitrogen pressure is dynamically adjusted through the metering tank nitrogen inlet valve 9 to ensure a stable material flow rate and avoid splashing or pipe blockage.

[0044] Second, the metering stage: The level gauge 6 (such as an ultrasonic sensor) provides real-time feedback on the liquid level in the metering tank 5. Combined with a preset volume-level reference table, the feeding amount is precisely controlled (error ≤ ±1%). Once the set value is reached, the corresponding nitrogen inlet valve and exhaust valve 4 are closed to stop feeding.

[0045] Third, reflux calibration control: Open the exhaust valve of the raw material tank and the corresponding return multi-way valve. The material flows back to the corresponding raw material tank under nitrogen pressure, eliminating overfilling caused by pressure fluctuations. After the liquid level stabilizes, close the return multi-way valve and the exhaust valve of the raw material tank to complete high-precision metering (single error <1%).

[0046] Fourth, feeding stage: Open the feed valve of the target reactor (such as the second feed multi-way valve 7-2), and the material in the metering tank 5 is injected into the first stirred reactor 10 under nitrogen pressure; after feeding is completed, the second feed multi-way valve 7-2 automatically closes. When switching to other raw material tanks or reactors, only the valves of the corresponding feed multi-way valves need to be adjusted (such as switching the second feed multi-way valve 7-2 and the third feed multi-way valve 7-3), and the system will automatically adapt to the new parameters without stopping the machine.

[0047] Fifth, automated control: The nitrogen inlet valve, discharge valve, and return valve are controlled collaboratively by a PLC program to form a closed-loop process of "feeding → metering → reflux → output".

[0048] Sixth, airtightness and safety design: First, a nitrogen protection mechanism: the nitrogen inlet valve and exhaust valve maintain a positive system pressure (0.5–1.0 MPa), isolating air and preventing material oxidation or volatilization; the unidirectional nitrogen flow design prevents external contaminants from entering. Second, leak prevention measures: all pipes and valves are connected with sealed flanges, combined with a nitrogen purging function to reduce volatile gas leakage; the metering tank exhaust valve 4 and all raw material tank exhaust valves have built-in filters to adsorb material residues and prevent environmental pollution.

[0049] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A closed-loop small-batch quantitative feeding system, characterized in that, It includes a first raw material tank (1-1), a second raw material tank (1-2), a third raw material tank (1-3), a fourth raw material tank (1-4), a metering tank (5), a first stirred reactor (10), and a second stirred reactor (11); The first raw material tank (1-1), the second raw material tank (1-2), the third raw material tank (1-3), and the fourth raw material tank (1-4) are respectively connected to the metering tank (5) through the first nitrogen inlet switch valve (2-1), the second nitrogen inlet switch valve (2-2), the third nitrogen inlet switch valve (2-3), and the fourth nitrogen inlet switch valve (2-4); the bottom of the metering tank (5) is respectively connected to the first stirred reactor (10) and the second stirred reactor (11) through the second discharge multi-way valve (7-2) and the third discharge multi-way valve (7-3); the bottom of the metering tank (5) is connected to the return multi-way valve through the first discharge multi-way valve (7-1).

2. The closed-loop small-batch quantitative feeding system according to claim 1, characterized in that, The return multi-way valve includes: a first return multi-way valve (8-1), a second return multi-way valve (8-2), a third return multi-way valve (8-3), and a fourth return multi-way valve (8-4); the first return multi-way valve (8-1), the second return multi-way valve (8-2), the third return multi-way valve (8-3), and the fourth return multi-way valve (8-4) are respectively connected to the first raw material tank (1-1), the second raw material tank (1-2), the third raw material tank (1-3), and the fourth raw material tank (1-4).

3. The closed-loop small-batch quantitative feeding system according to claim 1, characterized in that, The metering tank (5) is equipped with a level gauge (6); the level gauge (6) is used to measure the volume of chemical materials in the metering tank (5) in real time.

4. The closed-loop small-batch quantitative feeding system according to claim 1, characterized in that, The metering tank (5) is provided with a nitrogen inlet switch valve (9) above it; the nitrogen inlet switch valve (9) is used to control the amount of nitrogen entering the metering tank (5).

5. A closed-loop small-batch quantitative feeding system according to claim 1, characterized in that, The metering tank (5) is provided with a metering tank exhaust valve (4) at the top; the metering tank exhaust valve (4) is used to discharge the nitrogen gas from the metering tank (5).

6. The closed-loop small-batch quantitative feeding system according to claim 1, characterized in that, The first raw material barrel (1-1), the second raw material barrel (1-2), the third raw material barrel (1-3), and the fourth raw material barrel (1-4) are respectively provided with a first raw material barrel exhaust valve (3-1), a second raw material barrel exhaust valve (3-2), a third raw material barrel exhaust valve (3-3), and a fourth raw material barrel exhaust valve (3-4); the first raw material barrel exhaust valve (3-1), the second raw material barrel exhaust valve (3-2), the third raw material barrel exhaust valve (3-3), and the fourth raw material barrel exhaust valve (3-4) are respectively used to discharge nitrogen gas from the first raw material barrel (1-1), the second raw material barrel (1-2), the third raw material barrel (1-3), and the fourth raw material barrel (1-4).

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