Prefilter for DMF (Dimethyl Formamide) solution

Abstract

The utility model relates to the technical field of DMF (Dimethyl Formamide) solution, and discloses a DMF solution pre-filter which comprises a filter box, a first inclined plate, a limiting sleeve and a second inclined plate are fixedly connected in the filter box in sequence, a material conveying pipe is fixedly connected in the limiting sleeve, a circular roller is clamped and mounted between the limiting sleeve and the material conveying pipe, and the circular roller is fixedly connected with the second inclined plate. A rotating rod is fixedly connected to one end of the interior of the circular roller, a rhombic column is fixedly connected to the front end of the rotating rod, the front end of the filter box is movably sleeved with a belt wheel, and the belt wheel is sleeved with a belt. According to the DMF solution pre-filter, a DMF solution is filtered by the filter screen, then flows into the conveying pipe and is discharged, meanwhile, solid impurities are conveyed to the other end along with rotation of the circular roller, and meanwhile, the solid impurities are discharged through a second inclined plate, so that the filtering efficiency of the DMF solution is ensured, and the situation that the solid impurities are accumulated outside the filter screen after being filtered is avoided; therefore, the filtering efficiency is influenced.

Description

Technical Field

[0001] This utility model relates to the field of DMF solution technology, specifically to a DMF solution pre-filter. Background Technology

[0002] DMF (dimethylformamide) is a high-boiling-point polar aprotic solvent that is miscible with water and most organic solvents. It can also promote SN2 reactions and is one of the most commonly used solvents in organic synthesis. Before processing DMF solutions, waste materials in the DMF solution need to be pre-treated to remove solid impurities. Therefore, filters are used to filter the DMF solution.

[0003] In the conventional process of filtering DMF solutions, the filter device uses a filter screen placed inside the pipe through which the DMF solution flows. The filter screen effectively filters solid impurities in the DMF solution. However, as the DMF solution is continuously filtered, the solid impurities produced by filtration continuously accumulate on the filter screen, and the accumulation of solid impurities is not uniform. This limits the amount of solid waste that the filter can hold, and the accumulated solid impurities affect the filtration effect of the filter screen on the DMF solution. Therefore, frequent cleaning by operators is required. However, frequent cleaning of the filter screen will affect the filtration efficiency. Therefore, we propose a DMF solution pre-filter. Utility Model Content

[0004] To address the shortcomings of existing DMF solution pre-filters, this invention provides a DMF solution pre-filter that uses a filter screen to filter the solution. Furthermore, when the filter screen rotates, it can transport solid impurities to the upper part of a second inclined plate. In other words, while filtering the DMF solution, the filter screen can simultaneously clean the solid impurities generated during filtration, reducing the accumulation of solid impurities and solving the problems mentioned in the background section.

[0005] This utility model provides the following technical solution: a DMF solution pre-filter, including a filter box, inside which a first inclined plate, a limiting sleeve, and a second inclined plate are fixedly connected in sequence. Inside the limiting sleeve, a feed pipe is fixedly connected. A circular roller is clamped and installed between the limiting sleeve and the feed pipe. One end of the circular roller is fixedly connected to a rotating rod. A rhomboid column is fixedly connected to the front end of the rotating rod. A pulley is movably sleeved at the front end of the filter box. A belt is sleeved on the outside of the pulley. A gear set is sleeved on the inside of the other end of the belt. A first gear is meshed on one side of the gear set.

[0006] Preferably, a solid impurity discharge pipe is fixedly connected to the lower part of the second inclined plate, and a top cover is fitted onto the upper part of the filter box. An inlet pipe is fixedly connected to the inside of one end of the top cover, and the inlet pipe is located at the upper end of the first inclined plate.

[0007] Preferably, the limiting sleeve and the conveying pipe have a semi-circular cross-section, and the lower part of the front end of the filter box is provided with a discharge port, which is located at the lower end of the inside of the conveying pipe.

[0008] Preferably, a motor is installed on the outside of one end of the circular roller, the motor is installed outside the filter box, and filter screens with filter holes are installed at equal intervals on the outside of the circular roller.

[0009] Preferably, a scraper is fixedly connected to the outside of the rotating rod. The scraper is spiral-shaped and is fitted inside the conveying pipe.

[0010] Preferably, the pulley has a diamond-shaped groove in the middle, and the diamond-shaped column is movably fitted inside the diamond-shaped groove.

[0011] Preferably, a rotating scraper is fixedly connected to the inner side of the first gear, the rotating scraper is movably sleeved inside the filter box, and the rotating scraper is located at the upper end of the second inclined plate. The rotating scraper is installed on the side of the circular roller.

[0012] Compared with existing DMF solution pre-filters, this invention has the following advantages:

[0013] 1. This DMF solution pre-filter allows the DMF solution to flow through the filter screen and into the inside of the feed pipe before being discharged. At the same time, solid impurities are transported to the other end by the rotation of the circular drum and discharged through the second inclined plate. This ensures the filtration efficiency of the DMF solution and prevents the solid impurities after filtration from accumulating on the outside of the filter screen, which would affect the filtration efficiency.

[0014] 2. In this DMF solution pre-filter, after the rotating rod extends through the diamond-shaped column into the inside of the pulley, the rotating circular drum drives the solid impurities to be transported synchronously to the upper part of the second inclined plate. Through the linkage, the rotating scraper rotates synchronously in the opposite direction, ensuring that the solid impurities accumulated between the second inclined plate and the circular drum are transported to one side, avoiding the solid impurities from accumulating together after being scraped off, which would affect the rotation of the circular drum. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the present utility model;

[0016] Figure 2 This is a schematic diagram of the present invention without the top cover structure;

[0017] Figure 3 This is a schematic cross-sectional view of the main body of this utility model;

[0018] Figure 4 This is a schematic diagram of the side cross-sectional structure of the main body of this utility model;

[0019] Figure 5 This is an enlarged structural diagram of point A in this utility model;

[0020] Figure 6 This is an enlarged structural diagram of section B of the present invention.

[0021] In the diagram: 1. Filter box; 2. First inclined plate; 3. Limiting sleeve; 4. Second inclined plate; 5. Solid impurity discharge pipe; 6. Conveying pipe; 7. Circular roller; 8. Filter screen; 9. Rotating rod; 10. Scraper; 11. Rhomboid column; 12. Pulley; 13. Belt; 14. Gear set; 15. First gear; 16. Rotating scraper; 17. Top cover; 18. Feed pipe; 19. Discharge port. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 A DMF solution pre-filter includes a filter box 1. Inside the filter box 1, a first inclined plate 2, a limiting sleeve 3, and a second inclined plate 4 are fixedly connected in sequence. Inside the limiting sleeve 3, a feed pipe 6 is fixedly connected. The feed pipe 6 carries the filtered DMF solution for collection. A circular roller 7 is clamped and installed between the limiting sleeve 3 and the feed pipe 6. When the circular roller 7 rotates, it can carry solid impurities for transport. One end of the circular roller 7 is fixedly connected to a rotating rod 9. The front end of the rotating rod 9 is fixedly connected to a rhomboid column 11. A pulley 12 is movably sleeved at the front end of the filter box 1. A belt 13 is sleeved on the outside of the pulley 12. A gear set 14 is sleeved on the other end of the belt 13. One side of the gear set 14 is meshed with a first gear 15. After being engaged inside the pulley 12 by the rhomboid column 11, when the rotating rod 9 rotates, it synchronously drives the rotating scraper 16 to rotate in the opposite direction, ensuring that the rotation speed of the circular roller 7 and the rotating scraper 16 remains uniform.

[0024] Please see Figure 3A solid impurity discharge pipe 5 is fixedly connected to the lower part of the second inclined plate 4. A top cover 17 is sleeved on the upper part of the filter box 1. An inlet pipe 18 is fixedly connected to the inside of one end of the top cover 17. The inlet pipe 18 is located at the upper end of the first inclined plate 2 and is installed at the upper end of the filter box 1 through the top cover 17. At the same time, the inlet pipe 18 is located on one side of the top cover 17. The DMF solution is transported to the upper part of the first inclined plate 2 through the inlet pipe 18. The slope formed by the first inclined plate 2 drives the DMF solution to be transported to the inside of the circular drum 7 for filtration. At the same time, the solid impurities generated by filtration are transported to the inside of the second inclined plate 4 through the rotation of the circular drum 7. After the impurities accumulate inside the second inclined plate 4, they can be discharged through the solid impurity discharge pipe 5.

[0025] Please see Figure 3 The limiting sleeve 3 and the conveying pipe 6 have a semi-circular cross-section. The lower part of the front end of the filter box 1 is provided with a discharge port 19, which is located at the lower end of the conveying pipe 6. The limiting sleeve 3 and the conveying pipe 6 are circular. The circular roller 7 is sleeved between the limiting sleeve 3 and the conveying pipe 6. After the DMF solution is filtered, the filtered DMF solution flows into the interior of the conveying pipe 6 and is discharged through the discharge port 19, ensuring that the DMF solution is pre-filtered when used.

[0026] Please see Figure 4 A motor is installed on the outside of one end of the circular drum 7. The motor is installed outside the filter box 1. Filter screens 8 with filter holes are installed at equal intervals on the outside of the circular drum 7. The filter screens 8 are evenly installed on the outside of the circular drum 7. When the motor installed on the outside of the circular drum 7 is started, the motor controls the circular drum 7 to rotate. The filter screens 8 cover the outside of the circular drum 7 and filter the DMF solution that passes through.

[0027] Please see Figure 4 A scraper 10 is fixedly connected to the outside of the rotating rod 9. The scraper 10 is spiral-shaped and is fitted inside the conveying pipe 6. The rotating rod 9 rotates synchronously with the circular roller 7, which means that the rotating rod 9 can drive the scraper 10 to rotate inside the conveying pipe 6. When the DMF solution is filtered and accumulated inside the conveying pipe 6, the solution is prevented from accumulating inside the conveying pipe 6, which would affect the flow of the DMF solution.

[0028] Please see Figure 6The pulley 12 has a diamond-shaped groove in the middle, and the diamond-shaped column 11 is movably sleeved inside the diamond-shaped groove. It is installed at the front end of the filter box 1 through the pulley 12. During the process of controlling the circular roller 7 to be installed inside the filter box 1, the circular roller 7 drives the rotating rod 9 to extend to the front end. At the same time, the diamond-shaped column 11 is engaged inside the pulley 12. When the rotating rod 9 rotates, the rotating rod 9 drives the pulley 12 to rotate synchronously through the diamond-shaped column 11.

[0029] Please see Figure 2 A rotating scraper 16 is fixedly connected to the inner side of the first gear 15. The rotating scraper 16 is movably sleeved inside the filter box 1 and is located at the upper end of the second inclined plate 4. The rotating scraper 16 is installed on the side of the circular drum 7. When the pulley 12 rotates, the pulley 12 drives the rotating scraper 16 to rotate synchronously through the belt 13, gear set 14 and the first gear 15, controlling the circular drum 7 and the rotating scraper 16 to rotate in opposite directions. When the circular drum 7 rotates, it carries solid impurities to the other end. Through the scraping of the second inclined plate 4, the solid impurities accumulate on the upper part of the second inclined plate 4. At the same time, when the rotating scraper 16 rotates, it drives the impurities accumulated on the upper part of the second inclined plate 4 to be scraped off, avoiding the accumulation of impurities between the circular drum 7 and the second inclined plate 4, which would affect the rotation of the circular drum 7.

[0030] Working principle: In use, the DMF solution is conveyed to the upper part of the first inclined plate 2 through the feed pipe 18. At the same time, the first inclined plate 2 drives the DMF solution to slide and convey to one side of the circular drum 7. The motor installed on the outside of the circular drum 7 is started. The motor drives the circular drum 7 and the filter screen 8 to rotate. The filter screen 8 filters the passing DMF solution. At the same time, the solid impurities generated by filtration accumulate on the outer surface of the circular drum 7. After the solution is conveyed to the inside of the feed pipe 6, it is discharged through the discharge port 19. The solid impurities continue to rotate and are conveyed to the upper part of the second inclined plate 4. The rotating rod 9 drives the rotating scraper 16 to rotate through the linkage. The rotating scraper 16 carries the impurities to the inside of the second inclined plate 4 and is discharged through the solid impurity discharge pipe 5, thus completing the pre-filtration of the DMF solution.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A DMF solution pre-filter, comprising a filter box (1), wherein a first inclined plate (2), a limiting sleeve (3), and a second inclined plate (4) are sequentially fixedly connected inside the filter box (1), and a feed pipe (6) is fixedly connected inside the limiting sleeve (3), characterized in that: A circular roller (7) is clamped between the limiting sleeve (3) and the conveying pipe (6). A rotating rod (9) is fixedly connected to one end of the circular roller (7). A rhomboid column (11) is fixedly connected to the front end of the rotating rod (9). A pulley (12) is movably sleeved at the front end of the filter box (1). A belt (13) is sleeved on the outside of the pulley (12). A gear set (14) is sleeved on the inside of the other end of the belt (13). A first gear (15) is meshed on one side of the gear set (14).

2. A DMF solution pre-filter according to claim 1, characterized in that: The lower part of the second inclined plate (4) is fixedly connected to a solid impurity discharge pipe (5), and the upper part of the filter box (1) is fitted with a top cover (17). The inside of one end of the top cover (17) is fixedly connected to a feed pipe (18), which is located at the upper end of the first inclined plate (2).

3. A DMF solution pre-filter according to claim 1, characterized in that: The limiting sleeve (3) and the conveying pipe (6) have a semi-circular cross-section. The lower part of the front end of the filter box (1) is provided with a discharge port (19), which is located at the lower end of the conveying pipe (6).

4. A DMF solution pre-filter according to claim 1, characterized in that: A motor is installed on the outside of one end of the circular roller (7). The motor is installed outside the filter box (1). Filter screens (8) with filter holes are installed at equal intervals on the outside of the circular roller (7).

5. A DMF solution pre-filter according to claim 1, characterized in that: A scraper (10) is fixedly connected to the outside of the rotating rod (9). The scraper (10) is spiral in shape and is fitted inside the conveying pipe (6).

6. A DMF solution pre-filter according to claim 1, characterized in that: The pulley (12) has a diamond-shaped groove in the middle, and the diamond-shaped column (11) is movably sleeved inside the diamond-shaped groove.

7. A DMF solution pre-filter according to claim 1, characterized in that: A rotating scraper (16) is fixedly connected to the inner side of the first gear (15). The rotating scraper (16) is movably sleeved inside the filter box (1) and is located at the upper end of the second inclined plate (4). The rotating scraper (16) is installed on the side of the circular roller (7).

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