N-methyl pyrrolidone purification filter

Abstract

The utility model belongs to the technical field of chemical equipment, and discloses an N-methyl pyrrolidone purification filter which comprises a filter box, a liquid inlet is formed in the top end of the filter box, a liquid outlet is formed in the bottom end of the filter box, a primary filter screen is arranged in the filter box, a sediment filter screen matched with the primary filter screen is further arranged in the filter box, and the sediment filter screen is of a groove structure. A scraping plate perpendicular to the primary filter screen is arranged on the primary filter screen, the scraping plate is connected with a sliding rod, and the sliding rod is perpendicular to the scraping plate; the sliding rod is connected with a driving mechanism; according to the utility model, the filter screen can be automatically cleaned, and the filter screen can be cleaned according to the discharge amount of filtrate.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of chemical equipment, concretely relates to N-methyl pyrrolidone purification filter. BACKGROUND

[0002] When N-methyl pyrrolidone (NMP) is applied in the field of electronic insulating materials and lithium ion batteries, it is necessary to purify industrial-grade N-methyl pyrrolidone to remove residual particulate matter (solid catalyst residue), organic amine and metal ions in the industrial-grade N-methyl pyrrolidone. Therefore, it is usually necessary to sequentially perform multi-step processing such as dehydration, particle removal, organic impurity removal and cation exchange resin on the industrial-grade N-methyl pyrrolidone. In order to reduce the influence of residual particulate matter on the subsequent molecular sieve adsorption column and cation exchange resin, it is necessary to optimize the filtering process as much as possible and improve the filtering efficiency. SUMMARY

[0003] The utility model discloses a kind of N-methyl pyrrolidone purification filters capable of automatically cleaning filter screen.

[0004] Based on the above purpose, the utility model adopts the following technical scheme:

[0005] A kind of N-methyl pyrrolidone purification filter, including filter box, the top end of filter box is provided with liquid inlet, the bottom end of filter box is provided with liquid outlet, it is provided with primary filter screen in filter box, it is also provided with and cooperates with the primary filter screen in filter box sediment filter screen, sediment filter screen is recessed structure;Primary filter screen is provided with the scraper plate vertical to it, the scraper plate is connected with slide bar, and slide bar is perpendicular to scraper plate;Slide bar is connected with driving mechanism.

[0006] Further, the driving mechanism includes a rack fixedly connected to the slide bar, the rack is connected with a gear, the gear is fixedly connected with a rotating column coaxial with it, and the rotating column has a cylindrical structure;A helical drive groove is formed on the outer circumferential surface of the rotating column, and the drive groove is coaxial with the rotating column;The drive groove is slidably connected with a drive block, and the drive block is connected with a lifting structure.

[0007] Further, the lifting structure includes a rotating rod arranged above the drive block, and the rotating rod is rotatably connected to the filter box;One end of the rotating rod is connected to the drive block, and the other end is connected to a contact plate, and an intermittent solvent flushing assembly is arranged above the contact plate.

[0008] Further, the lifting structure further includes a counterweight fixedly connected to the drive block;The counterweight is slidably connected with a sliding groove, and the sliding groove is vertically arranged and fixedly connected to the filter box;The counterweight and the rotating rod are connected by a soft rope.

[0009] Further, the intermittent solvent flushing assembly comprises a filtrate storage tank arranged above the contact plate, and the filtrate storage tank is rotationally connected with the filter box through a rotating shaft; the rotating shaft divides the filtrate storage tank into a storage section and a water discharge section, the water discharge section is lighter than the storage section, and the water discharge section has a larger volume than the storage section; and the water discharge section is matched with the contact plate.

[0010] Further, the filter box is connected with a buffer tank through an inlet, a stop valve is arranged between the buffer tank and the inlet, a slag outlet is arranged on the filter box, and the slag outlet is arranged on one side of the slag filter screen; and the slag outlet is connected with a sealing cover plate.

[0011] Compared with the prior art, the utility model has the advantages of the following beneficial effects:

[0012] 1. The scraper of the application can scrape off the sundries on the primary filter screen under the driving of the driving mechanism, so that the primary filter screen can stably filter the mixed solution; the scraper is matched with the slag filter screen, can push the sundries into the slag filter screen, and the slag filter screen is arranged in a groove structure, so that the sundries can be deposited in the slag filter screen; the primary filter screen is prevented from being blocked, and the filtering efficiency is improved.

[0013] 2. The intermittent solvent flushing assembly sprays the solution on the contact plate to drive the rotating rod to rotate, then drives the counterweight and the sliding block to rise through the rotating rod, and finally drives the rotating column and the gear to rotate, so that the rack, the sliding rod and the scraper are moved to scrape off the sundries; when the filtrate is stored in the filtrate storage tank to a certain amount, the intermittent solvent flushing assembly can release the filtrate, and then drive the scraper to move, so that the application can automatically control the scraper to clean the filter screen according to the discharge amount of the filtrate, and automatically stop working when the filtrate is not discharged.

[0014] 3. The slag outlet and the stop valve are arranged in cooperation, the stop valve can be closed, the sundries on the slag filter screen can be taken out from the slag outlet, and the cleaning efficiency is improved; the sealing cover plate can seal the slag outlet, so that the filtrate is prevented from flowing out; and the filtering process is more stable. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic view of the embodiment 1 of the utility model;

[0016] Figure 2 It is a partial enlarged view of the embodiment 1 of the utility model;

[0017] Figure 3 It is a schematic view of the contact plate and the rotating rod connection of the embodiment 1 of the utility model;

[0018] Figure 4 It is a schematic view of the filter box of the embodiment 2 of the utility model.

[0019] In the diagram: 1. Filter box; 2. Inlet; 3. Outlet; 4. Primary filter screen; 5. Sediment filter screen; 6. Scraper; 7. Sliding rod; 8. Positioning groove; 9. Rack; 10. Gear; 11. Rotating column; 12. Drive groove; 13. Counterweight; 14. Slide groove; 15. Soft rope; 16. Rotating rod; 17. Drive block; 18. Storage section; 19. Water discharge section; 20. Contact plate; 21. Buffer tank; 22. Inlet pipe; 23. Shut-off valve; 24. Sealing cover; 25. Observation hole. Detailed Implementation

[0020] Example 1

[0021] An N-methylpyrrolidone purification filter, such as Figures 1-3 As shown, the filter includes a vertically arranged filter box 1, with an inlet 2 at the top and an outlet 3 at the bottom. A horizontal primary filter 4 is installed inside the filter box 1, and a sediment filter 5 that cooperates with the primary filter 4 is also installed inside the filter box 1. The sediment filter 5 has a groove structure and is located below the primary filter 4, with its upper right edge closely attached to the primary filter 4. A support rod for placing the sediment filter 5 is provided inside the filter box 1. A scraper 6 is provided on the primary filter screen 4. The scraper 6 is vertically arranged and perpendicular to the primary filter screen 4. The length direction of the scraper 6 is horizontal longitudinally. The scraper 6 is fixedly connected to a slide rod 7 arranged horizontally. One end of the slide rod 7 is located in the middle of the primary filter screen 4, and the other end is located at the end of the primary filter screen 4 away from the sludge filter screen 5. Both ends of the slide rod 7 are connected to the scraper 6. The slide rod 7 is slidably connected to a positioning groove 8. The positioning groove 8 is parallel to the slide rod 7 and fixedly connected to the filter box 1. The slide rod 7 is connected to a drive mechanism.

[0022] like Figures 1-2 As shown, the drive mechanism includes a rack 9 fixedly connected to the slide rod 7, and the rack 9 is parallel to the slide rod 7; the rack 9 is meshed with a gear 10, which is located at the middle of the primary filter screen 4 in the transverse direction. The axis of the gear 10 is vertically arranged, and a rotating column 11 coaxial with it is fixedly connected to the top of the gear 10. The rotating column 11 is a cylindrical structure and is rotatably connected to the filter box 1 through a bearing. The rotating column 11 is arranged to rotate around its axis; a spiral drive groove 12 is opened on the outer circumferential surface of the rotating column 11, and the drive groove 12 is coaxial with the rotating column 11; a drive block 17 is slidably connected in the drive groove 12, and the drive block 17 is connected to a lifting structure.

[0023] like Figures 1-3As shown in the figure, the lifting structure includes the counterweight block 13 fixedly connected with the driving block 17; the counterweight block 13 is slidingly connected with the sliding groove 14, the sliding groove 14 is vertically arranged, and the sliding groove 14 is fixedly connected with the filter box 1; the counterweight block 13 is connected with the rotating rod 16 through the soft rope 15; the lifting structure further includes the rotating rod 16 arranged above the driving block 17, the rotating rod 16 is rotatably connected with the filter box 1, the rotating axis of the rotating rod 16 is perpendicular to the sliding rod 7 and is horizontally and longitudinally arranged; one end of the rotating rod 16 is connected with the soft rope 15, and the other end is connected with the contact plate 20, and the intermittent solvent flushing assembly is arranged above the contact plate 20.

[0024] As shown in the figure, Figure 1 The intermittent solvent flushing assembly includes the filtrate storage tank arranged above the contact plate 20; the filtrate storage tank is a tubular structure with one end open and the other end closed, and the opening of the filtrate storage tank is obliquely arranged so that the opening faces upward when the filtrate storage tank is empty; the filtrate storage tank is rotatably connected with the filter box 1 through the rotating shaft, and the rotating shaft is horizontally and longitudinally arranged; the rotating shaft divides the filtrate storage tank into the storage section 18 and the water discharge section 19, the water discharge section 19 is lighter than the storage section 18, the water discharge section 19 has a larger volume than the storage section 18, and the opening of the filtrate storage tank is arranged in the water discharge section 19; the water discharge section 19 cooperates with the contact plate 20, and the opening of the filtrate storage tank is located directly above the contact plate 20. The liquid inlet 2 of the filter box 1 is connected with the buffer tank 21, and the buffer tank 21 is arranged between the liquid inlet 2 and the liquid inlet pipe 22, and the liquid inlet pipe 22 is provided with a stop valve 23; the filter box 1 is provided with a slag outlet, the slag outlet is arranged on one side of the sediment filter screen 5 and has a larger cross section than the sediment filter screen 5, so that the sediment filter screen 5 can be easily taken out; and the slag outlet is connected with the sealing cover 24 plate.

[0025] When the filtrate is filtered, the filtrate flows into the filtrate storage tank from the liquid inlet 2, and when the filtrate in the filtrate storage tank reaches a set amount, the weight of the water discharge section 19 is greater than that of the storage section 18; at this time, the water discharge section 19 of the filtrate storage tank rotates downward, and the filtrate flows out of the opening of the filtrate storage tank and falls onto the contact plate 20. The contact plate 20 rotates downward under the impact of a large amount of filtrate, so that the rotating rod 16 rotates upward; the rotating rod 16 drives the counterweight block 13 and the sliding block to rise through the soft rope 15, the sliding block drives the driving groove 12 to rotate after rising, and drives the rotating column 11 and the gear 10 to rotate; the gear 10 drives the sliding rod 7 to slide in the positioning groove 8 through the rack 9, the sliding rod 7 drives the scraper 6 to move, and the impurities are scraped off; only when a certain amount of filtrate is stored in the filtrate storage tank, the intermittent solvent flushing assembly can release the filtrate, thereby driving the scraper 6 to move, the solid particles on the primary filter screen 4 are scraped off by the scraper 6, and are pushed into the sediment filter screen 5. When the sediment filter screen 5 is cleaned, the stop valve 23 is closed, and the sealing cover 24 plate is opened, so that the sediment on the sediment filter screen 5 can be easily taken out from the slag outlet.

[0026] Example 2

[0027] The other parts of this embodiment are the same as those of example 1, and the difference lies in that, as shown in the figure,Figure 4 As shown, the filter box 1 is provided with an observation hole 25, the observation hole 25 is arranged above the sealing cover 24 plate, and a transparent glass is arranged in the observation hole 25; the sediment accumulation in the sediment filter screen 5 can be observed from the observation hole 25, so as to determine whether the sediment filter screen 5 should be cleaned. The primary filter screen 4 is arranged in an inclined manner, the end of the primary filter screen 4 away from the sediment filter screen 5 is higher than the end of the primary filter screen 4 contacting the sediment filter screen 5, so as to facilitate the sediment to enter the sediment filter screen 5; in order to ensure that the scraper 6 contacts the primary filter screen 4, a vertical automatic telescopic rod is arranged between the scraper 6 and the slide rod 7; the automatic telescopic rod comprises a fixed barrel fixedly connected with the slide rod 7, the fixed barrel is closed at the top end and is open at the bottom end; a telescopic barrel is slidably connected in the fixed barrel, the telescopic barrel is closed at the bottom end and is open at the top end, and springs are arranged in the fixed barrel and the telescopic barrel; one end of the spring is connected with the bottom end of the telescopic barrel, and the other end is connected with the top end of the fixed barrel.

Claims

1. An N-methylpyrrolidone purification filter, comprising a filter box, an inlet at the top of the filter box, an outlet at the bottom of the filter box, and a primary filter screen disposed inside the filter box, characterized in that... The filter box is also equipped with a sediment filter screen that cooperates with the primary filter screen. The sediment filter screen has a groove structure. The primary filter screen is equipped with a scraper, and the scraper is connected to a sliding rod. The sliding rod is connected to a driving mechanism.

2. The N-methylpyrrolidone purification filter as described in claim 1, characterized in that, The driving mechanism includes a rack fixedly connected to a slide rod, the rack meshing with a gear, the gear being fixedly connected to a rotating column coaxial with it; a spiral driving groove is formed on the outer circumferential surface of the rotating column, the driving groove being coaxial with the rotating column; a driving block is slidably connected to the driving groove, and the driving block is connected to a lifting structure.

3. The N-methylpyrrolidone purification filter as described in claim 2, characterized in that, The lifting structure includes a rotating rod disposed above the drive block, the rotating rod being rotatably connected to the filter box; one end of the rotating rod is connected to the drive block, and the other end is connected to a contact plate, with an intermittent solvent rinsing assembly disposed above the contact plate.

4. The N-methylpyrrolidone purification filter as described in claim 3, characterized in that, The lifting structure also includes a counterweight block fixedly connected to the drive block; the counterweight block is slidably connected to a groove, the groove is vertically arranged, and the groove is fixedly connected to the filter box; a soft rope is connected between the counterweight block and the rotating rod.

5. The N-methylpyrrolidone purification filter as described in claim 4, characterized in that, The intermittent solvent rinsing assembly includes a filtrate storage tank disposed above the contact plate, the filtrate storage tank being rotatably connected to the filter box via a rotating shaft; the rotating shaft divides the filtrate storage tank into a storage section and a discharge section, the discharge section being lighter than the storage section; the discharge section cooperates with the contact plate.

6. The N-methylpyrrolidone purification filter as described in claim 5, characterized in that, The filter box has a buffer tank connected to its inlet, and a shut-off valve is provided between the buffer tank and the inlet. The filter box has a slag outlet located on one side of the sediment filter screen. The slag outlet is connected to a sealing cover.

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