Gas phase silicon dioxide powder closed sampling device based on gas-solid separation

Abstract

The utility model discloses a kind of fumed silica powder airtight sampling device based on gas-solid separation, it relates to fumed silica production equipment technical field, it includes storage tube, product feed assembly, gas-solid separation component, sampling execution component and compressed air backflushing component;Product feed assembly contains feed channel and first valve, and connects product unpacking workshop pipeline and storage tube;Gas-solid separation component contains filter cartridge and gas circuit pipeline, realize gas-solid diversion and guide away impurity;Sampling execution component negative pressure sampling tube, air hole disc, fixed clamp and sampling bag, complete airtight sampling and residual cleaning;Backflushing component is connected with filter cartridge, and guarantee filter cartridge unobstructed.The utility model sampling device realizes airtight sampling in whole process, no powder leakage, sample purity is high;It is convenient to operate, and does not interfere with production main process, adapts fumed silica continuous production demand.

Description

Technical Field

[0001] This utility model relates to the technical field of fumed silica production equipment, and in particular to a closed sampling device for fumed silica powder based on gas-solid separation. Background Technology

[0002] In the industrial production of fumed silica, in order to monitor product quality in real time and ensure that the finished product indicators meet the standard requirements, it is necessary to regularly sample and analyze the powder materials in the production process. The efficiency of the sampling process and the purity of the samples directly affect the accuracy and timeliness of production quality control. Therefore, the rationality and reliability of the sampling device have become a key component of the fumed silica production equipment system.

[0003] Currently, the industry commonly uses pipeline venting sampling for fumed silica sampling. The core operation of this method involves directly opening a sampling port on the conveying pipeline of the fumed silica production line, and obtaining the sample by opening the sampling port valve and using the pressure of the material within the pipeline to vent it. However, this existing sampling method has the following shortcomings in practical application: First, the lack of an effective sealing structure during venting sampling allows a large amount of fumed silica powder to leak into the production area, wasting material resources and causing a large amount of dust to float in the air in the sampling area, polluting the production environment. Second, the leaked dust and dust impurities in the external environment can easily mix directly into the sample to be tested, leading to reduced sample purity and a deviation from the actual production material, thus distorting subsequent quality analysis results and failing to provide reliable data support for production process adjustments and finished product quality assessment.

[0004] In summary, there is an urgent need for a new sampling technology solution that can solve the above-mentioned defects and is suitable for the production scenario of fumed silica, so as to improve the airtightness, sample purity and ease of operation of the sampling process. Summary of the Invention

[0005] To address the aforementioned technical problems, this utility model provides a closed sampling device for fumed silica powder based on gas-solid separation. Through the synergistic effect of gas-solid separation, closed flow channel, and negative pressure control, it achieves closed sampling of fumed silica powder. This not only solves the problems of powder leakage polluting the environment and inaccurate sample doping in the prior art, but also features convenient operation and does not interfere with the main production process during sampling, ensuring sample representativeness and production continuity.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a closed sampling device for gas phase silica powder based on gas-solid separation, including a storage pipe, a product feeding component, a gas-solid separation component and a negative pressure sampling component. The product feeding assembly includes a feeding channel and a first valve. One end of the feeding channel is connected to the product packaging workshop pipeline, and the other end is connected to the inlet of the storage pipe. The first valve is installed on the feeding channel and is used to control the flow of product materials into the storage pipe. The gas-solid separation assembly includes a filter cartridge and an air passage pipe. The bottom of the storage pipe, away from the feed channel, is fixed with a flange-sealed base. The filter cartridge is located inside the storage pipe and fixed on the flange-sealed base. The filter cartridge has several filter holes. The inner cavity of the filter cartridge is connected to the inner cavity of the storage pipe through the filter holes. One end of the air passage pipe passes through the flange-sealed base and is connected to the inner cavity of the filter cartridge. The other end of the air passage pipe is connected to the off-grade product feeding pipe to introduce the compressed air and trace impurity powder separated by the filter cartridge into the off-grade product processing stage. The negative pressure sampling assembly includes a negative pressure sampling tube, a second valve, an venting disc, a fixing clamp, a sampling bag, and a third valve. One end of the negative pressure sampling tube passes through a flange-sealed base and communicates with the inner cavity of the storage tube. The other end of the negative pressure sampling tube is divided into two paths: one path is a negative pressure passage connected to a negative pressure source, and the other path is a sampling passage connected to the venting disc. The fixing clamp is a detachable structure used to seal and fix the opening edge of the sampling bag to the discharge end of the venting disc. The second valve is located on the negative pressure passage and is used to control the opening and closing of the negative pressure passage. The third valve is located on the sampling passage and is used to control the entry and exit of fumed silica powder trapped in the storage tube into the sampling bag.

[0007] Furthermore, the filter cartridge has a filter pore diameter of 0.1-1μm, and an annular material retention cavity is formed between the outer wall of the filter cartridge and the inner wall of the storage tube, and the negative pressure sampling tube is connected to the annular material retention cavity.

[0008] Furthermore, it also includes a compressed air backflush assembly, which includes a backflush pipe and a fourth valve. One end of the backflush pipe is connected to an air pipeline, and the other end is used to connect to a clean compressed air source. The fourth valve is installed on the backflush pipe and is used to control the flow of the backflush airflow to clean the filter holes of the filter cartridge.

[0009] Furthermore, the fixing clip is a quick-release buckle clip, which includes two symmetrically arranged arc-shaped clamping arms and an elastic lock. The inner side of the arc-shaped clamping arms is provided with anti-slip protrusions, and the elastic lock is used to fasten the two arc-shaped clamping arms together, so that the opening edge of the sampling bag is tightly attached to the discharge end of the air vent plate.

[0010] Furthermore, the storage tube is made of 316L stainless steel, and the inner wall of the storage tube is mirror polished with a polishing roughness Ra≤0.8μm.

[0011] Furthermore, the air passage is equipped with a flow regulating valve, which is used to control the flow rate of the compressed air separated by the filter cartridge entering the substandard product feeding pipe.

[0012] Furthermore, a transparent observation window is provided on the side wall of the storage tube for observing the amount of fumed silica powder retained and the sampling status inside the storage tube.

[0013] The beneficial effects of this utility model are: 1. The sampling device of this utility model adopts a fully enclosed design. The product feeding component is sealed and connected to the production pipeline, the gas pipeline diverts impurities in a directional manner, and the sampling execution component uses a fixing clamp to seal and fix the sampling bag. From material introduction and gas-solid separation to sample collection, there is no powder leakage throughout the entire process, effectively solving the problem of floating dust polluting the environment and being difficult to clean at the sampling site, protecting the production site working environment and personnel health. Simultaneously, the gas-solid separation component accurately traps fumed silica powder through a filter cartridge, and impurities are completely diverted through the non-standard product pipeline. The negative pressure pretreatment stage removes residual impurities from the storage pipe, ensuring that the final sample is only pure target powder. This effectively avoids the problem of environmental dust contamination affecting the analysis results, significantly improving the representativeness and accuracy of the test data for production quality.

[0014] 2. The design of the filter cartridge and annular material retention chamber of this utility model can efficiently separate compressed air and fumed silica powder in the material, with stable separation efficiency and no risk of powder penetration; the air pipeline directs the separated compressed air and trace impurities into the non-contaminated product feeding pipeline, which neither contaminates the retained sample nor flows back to the main process of qualified products, avoiding impurities from affecting the quality of finished products and ensuring that the sampling process does not interfere with the normal production order.

[0015] 2. This utility model's sampling device uses a product feeding component to divert samples from the pipeline leading to the packaging workshop, ensuring that the sample and the finished product originate from the same source. The sampling data directly reflects the quality of the finished product. Only trace amounts of material are extracted during sampling, preventing insufficient or delayed material supply in the main process. Simultaneously, the impurity introduction and other foreign product handling processes after gas-solid separation do not occupy qualified product capacity. The entire sampling process has minimal interference with the main production process and can be completed during continuous production. It balances sample representativeness with production continuity, fully adapting to the large-scale, continuous production mode of fumed silica. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] In the diagram: 1. Storage pipe; 2. Flange-sealed base; 3. Feed channel; 4. First valve; 5. Filter cartridge; 6. Air pipeline; 7. Negative pressure sampling pipe; 71. Negative pressure passage; 72. Sampling passage; 8. Second valve; 9. Air vent plate; 10. Fixing clamp; 11. Sampling bag; 12. Third valve; 13. Exhaust pipe; 14. Backflush pipe; 15. Fourth valve; 16. Annular material interception chamber; 17. Pipeline for product to packaging workshop. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] This utility model discloses a closed sampling device for fumed silica powder based on gas-solid separation, which aims to solve the problems of powder leakage polluting the environment, sample contamination affecting accuracy, and cumbersome operation in existing pipeline venting sampling technology. Through the coordinated design of storage pipe 1, product feeding component, gas-solid separation component, negative pressure sampling component, etc., the device achieves closed and precise sampling of fumed silica powder, while taking into account the convenience of operation and long-term stability.

[0020] Reference Figure 1 A closed sampling device for fumed silica powder based on gas-solid separation is disclosed, comprising a storage pipe 1, a product feeding component, a gas-solid separation component, and a negative pressure sampling component. The product feeding component includes a feeding channel 3 and a first valve 4. One end of the feeding channel 3 is connected to the product-to-packaging pipeline 17 in the fumed silica production process, ensuring that the sampled material originates from the same source as the qualified products in the main production process, thus guaranteeing the representativeness of the sample to the finished product quality from the source. The other end is connected to the inlet of the storage pipe 1. The first valve 4 is installed on the feeding channel 3 to control the flow of product material into the storage pipe 1.

[0021] The gas-solid separation assembly includes a filter cartridge 5 and a gas pipeline 6. To achieve a sealed bottom for the storage pipe 1 and a stable installation of the filter cartridge 5, a flange-sealed base 2 is fixed to the bottom of the end of the storage pipe 1 away from the feed channel 3. The filter cartridge 5 is located inside the storage pipe 1 and fixed to the flange-sealed base 2. Several filter holes are opened on the filter cartridge 5, and the inner cavity of the filter cartridge 5 is connected to the inner cavity of the storage pipe 1 through the filter holes. The pore size of the filter holes is controlled at 0.1-1μm. This specification allows compressed air entrained in the material to pass through smoothly and effectively traps gaseous silica powder, achieving efficient gas-solid separation. At the same time, the outer wall of the filter cartridge 5 and the inner wall of the storage pipe 1 form an annular material trapping cavity 16, providing temporary storage space for the trapped pure powder. The subsequent negative pressure sampling pipe 7 is directly connected to this cavity to ensure that only the trapped target powder is sampled during sampling.

[0022] One end of the gas pipeline 6 passes through the flange-sealed base 2 and is sealed and connected to the inner cavity of the filter cartridge 5. The other end of the gas pipeline 6 is connected to the feed pipeline for non-standard products in the gas phase silica production process. The compressed air and trace impurity powder separated by the filter cartridge 5 can be introduced into the non-standard product treatment stage through this pipeline, which neither contaminates the retained sample nor affects the quality of qualified products, thus achieving complete separation of impurities and samples.

[0023] The negative pressure sampling assembly includes a negative pressure sampling tube 7, a second valve 8, an air vent plate 9, a fixing clamp 10, a sampling bag 11, and a third valve 12. One end of the negative pressure sampling tube 7 passes through the flange-sealed base 2 and communicates with the annular material interception chamber 16 inside the storage tube 1. The other end is provided with a negative pressure passage 71 and a sampling passage 72. The negative pressure passage 71 is connected to an external negative pressure source. The second valve 8 is installed on the negative pressure passage 71 to control its opening and closing. Before sampling, the second valve 8 is opened to remove the residual material or impurities from the previous sample in the chamber through negative pressure, ensuring the purity of the current sample. After sampling, the valve is opened again to completely remove the residual powder from the storage tube 1 and avoid cross-contamination.

[0024] The sampling passage 72 is sealed to the vent plate 9. The fixing clip 10 is a detachable structure used to seal and fix the opening edge of the sampling bag 11 to the discharge end of the vent plate 9. The vent plate 9 is connected to an exhaust pipe 13, which is connected to the air passage pipe 6 to ensure the air pressure balance in the sampling bag 11 during sampling. The third valve 12 is set on the sampling passage 72 to control the flow of fumed silica powder retained in the storage pipe 1 into the sampling bag 11. When the third valve 12 is opened, the retained pure powder can enter the sampling bag 11. The operation is convenient and there is no external contamination.

[0025] To address the issue of filter pore blockage in filter cartridge 5 after prolonged use, the device is also equipped with a compressed air backflushing assembly. This assembly includes a backflushing pipe 14 and a fourth valve 15. One end of the backflushing pipe 14 is connected to the air pipeline 6, while the other end is used to connect to a clean compressed air source. The fourth valve 15 is located on the backflushing pipe 14 and is used to control the flow of the backflushing air. When the separation efficiency of filter cartridge 5 decreases, the fourth valve 15 is opened to allow clean air to flow back into filter cartridge 5, blowing the powder blocking the filter pores into the annular material retention chamber 16. This powder is then cleaned under negative pressure, which quickly restores the patency of filter cartridge 5 and extends its service life.

[0026] The fixing clip 10 is a quick-release buckle clip, which includes two symmetrically arranged arc-shaped clamping arms and an elastic lock. The inner side of the arc-shaped clamping arms is provided with anti-slip protrusions. The elastic lock is used to fasten the two arc-shaped clamping arms, so that the opening edge of the sampling bag 11 is tightly attached to the discharge end of the venting plate 9. When installing the sampling bag 11, the bag opening is attached to the discharge end of the venting plate 9, and the clamping arms are fastened by the elastic lock. The anti-slip protrusions enhance the friction to prevent the sampling bag 11 from falling off. The clamping arm pressure ensures that the bag opening is tightly attached to the venting plate 9, forming a completely sealed sampling space.

[0027] The storage tube 1 is made of 316L stainless steel, and its inner wall is mirror-polished with a roughness Ra≤0.8μm to reduce adsorption residue of fumed silica powder and minimize material waste and cross-contamination risks. A flow regulating valve is installed on the air path 6 to control the flow rate of compressed air after separation by the filter cartridge 5 into the feed pipe for non-standard products. The flow rate control range is 0.5-2m / s; this prevents excessively fast flow rates from impacting the filter cartridge 5 or excessively slow flow rates from affecting separation efficiency, ensuring the stability of gas-solid separation. A transparent observation window made of borosilicate glass is installed on the side wall of the storage tube 1, allowing operators to observe the amount of powder retained and its flow status in real time, promptly determine sampling timing and identify abnormalities, and improve operational intuitiveness and safety.

[0028] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A closed sampling device for fumed silica powder based on gas-solid separation, characterized in that: Includes storage pipe (1), product feeding assembly, gas-solid separation assembly and negative pressure sampling assembly; The product feeding assembly includes a feeding channel (3) and a first valve (4). One end of the feeding channel (3) is connected to the product packaging workshop pipeline (17), and the other end is connected to the inlet of the storage pipe (1). The first valve (4) is installed on the feeding channel (3) to control the flow of product materials into the storage pipe (1). The gas-solid separation assembly includes a filter cartridge (5) and an air passage pipe (6). The bottom of the storage pipe (1) away from the feed channel (3) is fixed with a flange-sealed base (2). The filter cartridge (5) is located inside the storage pipe (1) and fixed on the flange-sealed base (2). The filter cartridge (5) has several filter holes. The inner cavity of the filter cartridge (5) is connected to the inner cavity of the storage pipe (1) through the filter holes. One end of the air passage pipe (6) passes through the flange-sealed base (2) and is connected to the inner cavity of the filter cartridge (5). The other end of the air passage pipe (6) is connected to the non-standard product feeding pipe so as to introduce the compressed air and trace impurity powder separated by the filter cartridge (5) into the non-standard product processing stage. The negative pressure sampling assembly includes a negative pressure sampling tube (7), a second valve (8), an air vent plate (9), a fixing clamp (10), a sampling bag (11), and a third valve (12). One end of the negative pressure sampling tube (7) passes through the flange-sealed base (2) and communicates with the inner cavity of the storage pipe (1). The other end of the negative pressure sampling tube (7) is divided into two paths. One path is set as a negative pressure passage (71), which is connected to a negative pressure source. The other path is set as a sampling passage (72). 72) Connected to the vent plate (9); the fixing clamp (10) is a detachable structure, used to seal and fix the opening edge of the sampling bag (11) to the discharge end of the vent plate (9); the second valve (8) is set on the negative pressure passage (71) to control the opening and closing of the negative pressure passage (71); the third valve (12) is set on the sampling passage (72) to control the opening and closing of the gas phase silica powder trapped in the storage pipe (1) into the sampling bag (11).

2. The closed sampling device for fumed silica powder based on gas-solid separation according to claim 1, characterized in that: The filter cartridge (5) has a filter pore diameter of 0.1-1μm, and an annular material retention cavity (16) is formed between the outer wall of the filter cartridge (5) and the inner wall of the storage tube (1). The negative pressure sampling tube (7) is connected to the annular material retention cavity (16).

3. The closed sampling device for fumed silica powder based on gas-solid separation according to claim 1, characterized in that: It also includes a compressed air backflush assembly, which includes a backflush pipe (14) and a fourth valve (15). One end of the backflush pipe (14) is connected to the air passage pipe (6), and the other end is used to connect to a clean compressed air source. The fourth valve (15) is set on the backflush pipe (14) and is used to control the flow of backflush air to clean the filter holes of the filter cartridge (5).

4. A closed sampling device for fumed silica powder based on gas-solid separation according to any one of claims 1 to 3, characterized in that: The fixing clip (10) is a quick-release buckle clip. The quick-release buckle clip includes two symmetrically arranged arc-shaped clamping arms and an elastic lock. The inner side of the arc-shaped clamping arms is provided with anti-slip protrusions. The elastic lock is used to fasten the two arc-shaped clamping arms together so that the opening edge of the sampling bag (11) is tightly attached to the discharge end of the air vent plate (9).

5. A closed sampling device for fumed silica powder based on gas-solid separation according to claim 4, characterized in that: The storage tube (1) is made of 316L stainless steel. The inner wall of the storage tube (1) is mirror polished, and the polishing roughness Ra≤0.8μm.

6. A closed sampling device for fumed silica powder based on gas-solid separation according to claim 5, characterized in that: The air passage (6) is equipped with a flow regulating valve, which is used to control the flow rate of the compressed air after separation by the filter cartridge (5) entering the substandard product feeding pipeline.

7. A closed sampling device for fumed silica powder based on gas-solid separation according to claim 6, characterized in that: The storage tube (1) is provided with a transparent observation window on its side wall for observing the amount of fumed silica powder retained and the sampling status in the storage tube (1).

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