A NMP waste liquid recovery device

Abstract

This utility model discloses an NMP waste liquid recovery device, including a filter box, a purification tower, and a transfer pump. A partition is fixedly connected inside the filter box, dividing it into two filter chambers. Each filter chamber has an inlet and an outlet fixed and connected to its top and bottom, respectively. Valves are installed on both the inlet and outlet. The bottom ends of the two outlets are connected to the inlet of the transfer pump, and the outlet of the transfer pump is connected to the purification tower. A filter assembly is inserted into the inner wall of each filter chamber, and a cleaning port is provided on the side wall of the filter chamber opposite one end of the filter assembly. This utility model facilitates the disassembly and replacement of the filter screen without interrupting the operation of the device, thus improving the production efficiency of the device.

Description

Technical Field

[0001] This utility model relates to the field of NMP waste liquid recycling technology, and in particular to an NMP waste liquid recycling device. Background Technology

[0002] NMP waste liquid is mainly generated during the production of lithium batteries. Its main component is N-methylpyrrolidone, and it also contains impurities such as water, cathode powder particles, and carbon powder. NMP, as a high-boiling-point, highly polar organic solvent, has excellent dissolving power, but direct discharge not only wastes resources but also harms aquatic and soil ecosystems due to its biotoxicity. NMP waste liquid recycling typically employs distillation, utilizing the difference in boiling points between NMP and other impurities to purify the NMP in the waste liquid to a reusable standard, reducing environmental pollution and achieving the recycling of NMP waste liquid.

[0003] Existing NMP waste liquid recovery devices typically perform pretreatment by filtration before distillation and purification using a purification tower to avoid damage to the distillation equipment and extend its lifespan. However, replacing the filter screen requires shutdown, reducing the device's recovery and filtration efficiency. For example, utility model patent CN222454614U discloses a distillation and purification device for NMP waste liquid recovery, including a purification tower. A transfer pump is fixedly connected to one side of the purification tower, and a fixed tank is fixedly connected to one end of the transfer pump. A sealing cap is centrally located on the top surface of the fixed tank, and a connecting pipe is fixedly connected to one side of the top surface of the sealing cap. A liquid delivery pipe is fixedly connected to the upper end of the connecting pipe, and a filter cylinder is located on the side of the bottom surface of the sealing cap. The filter cylinder has a cleaning mechanism inside.

[0004] While the filter assembly of the aforementioned device can effectively filter waste liquid and is easy to disassemble for centralized cleaning of filtered impurities, disassembly requires rotating the sealing cap to separate it from the fixed container, removing the filter cartridge from inside the container, unscrewing the bolts, and then taking the filter cartridge off for cleaning. This process necessitates stopping the filter assembly's operation, thus interrupting NMP waste liquid filtration and subsequent purification, reducing the device's production efficiency.

[0005] Therefore, it is necessary to develop an NMP waste liquid recovery device to address the above-mentioned shortcomings. Utility Model Content

[0006] The purpose of this invention is to provide an NMP waste liquid recovery device that facilitates the disassembly and replacement of the filter screen without interrupting the operation of the device, thereby improving the production efficiency of the device.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This utility model discloses an NMP waste liquid recovery device, comprising a filter box, a purification tower, and a transfer pump. A partition is fixedly connected inside the filter box, dividing it into two filter chambers. Each filter chamber has an inlet and an outlet fixedly connected to its top and bottom, respectively. Valves are installed on both the inlet and outlet. The bottom ends of the two outlets are connected to the inlet of the transfer pump, and the outlet of the transfer pump is connected to the purification tower. A filter assembly is inserted into the inner wall of each filter chamber, and a cleaning port is provided on the side wall of the filter chamber opposite one end of each filter assembly.

[0008] Furthermore, the filter assembly includes a fixed frame, and a filter screen is fixedly connected to the middle position of the fixed frame.

[0009] Furthermore, a baffle is fixedly connected to the top surface of the fixed frame, and the side wall of the baffle is flush with the side wall of the fixed frame.

[0010] Furthermore, each of the filter chambers has symmetrically formed grooves on its inner walls at both ends that communicate with the cleaning port, and the side walls at both ends of the fixing frame and the two sides of the baffle are inserted into the grooves.

[0011] Furthermore, the outer wall of the filter box is provided with an installation groove surrounding the cleaning port, and a first sealing strip is fixedly connected in the installation groove. A sealing plate adapted to the installation groove is fixedly connected to the outer wall of one end of the baffle, and a second sealing strip that cooperates with the first sealing strip is fixedly connected to the inner wall of the sealing plate.

[0012] Furthermore, a pressure rod is rotatably connected to the side wall of the filter box above both ends of each cleaning port, and a limiting member is provided on the side wall of the filter box below both ends of the cleaning port corresponding to the pressure rod. The limiting member is used to fix the pressure rod.

[0013] Furthermore, the limiting member includes two clamping plates, one of which has a first limiting hole, and one end of the pressure rod has a second limiting hole that matches the first limiting hole. The pressure rod is fixed to the clamping plate by passing through the first limiting hole and the second limiting hole in sequence via a limiting rod.

[0014] Furthermore, a first magnet is fixedly connected to the inner wall of the other clamping plate opposite to the first limiting hole, and a second magnet with opposite magnetism to the first magnet is fixedly connected to the top of the limiting rod.

[0015] Compared with the prior art, the beneficial technical effects of this utility model are as follows: This invention features two independent filter chambers inside the filter box, each with its own inlet and outlet valves. This allows the filter components in the two chambers to work alternately. When a filter component in one chamber needs cleaning or replacement, simply close the inlet and outlet valves of that chamber and open the valve of the other chamber. This allows the waste liquid to continue filtering through the standby filter chamber, thus avoiding downtime during filter component replacement and cleaning, and improving the production efficiency of the device.

[0016] Meanwhile, the filter components are installed on the inner wall of the filter chamber by plugging them in. When maintenance or replacement of the filter components is required, the staff can directly pull out the plugged filter components through the cleaning port without complicated disassembly steps, which simplifies the operation process and facilitates the replacement of the filter components.

[0017] In addition, by installing the groove, sealing plate, first sealing strip, and second sealing strip, the cleaning port can be sealed to prevent leakage and improve the safety of the device. Attached Figure Description

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

[0019] Figure 1 This is a schematic diagram of the NMP waste liquid recovery device of this utility model; Figure 2 This is a three-dimensional structural diagram of the filter box of this utility model; Figure 3 for Figure 2 A magnified view of part A in the middle; Figure 4 This is a three-dimensional structural diagram of the filter assembly of this utility model.

[0020] Explanation of reference numerals in the attached drawings: 1. Filter box; 2. Purification tower; 3. Transfer pump; 4. Baffle; 5. Filter chamber; 6. Inlet; 7. Outlet; 8. Cleaning port; 9. Fixing frame; 10. Filter screen; 11. Baffle; 12. Groove; 13. Mounting groove; 14. First sealing strip; 15. Sealing plate; 16. Second sealing strip; 17. Pressure rod; 18. Clamping plate; 19. First limiting hole; 20. Second limiting hole; 21. Limiting rod; 22. First magnet; 23. Second magnet; 24. Valve. Detailed Implementation

[0021] The core of this invention is to provide an NMP waste liquid recovery device that facilitates the disassembly and replacement of the filter screen without interrupting the operation of the device, thereby improving the production efficiency of the device.

[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 a part of the embodiments of the present utility model, and not all of them. 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] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] It is understood that all electrical components mentioned in this article are electrically connected to the main controller and power supply, and all electrical components mentioned in this article are conventional and known devices. This application will not elaborate further. The main controller can be a conventional and known device such as a computer that performs control. The control circuit of the main controller can be implemented by a person skilled in the art through simple programming. The power supply is also common knowledge in the art. Furthermore, this utility model is mainly used to protect mechanical devices. Therefore, this utility model will not explain the control method and circuit connection in detail. At the same time, all parts not described in detail in this utility model are common technologies known to those skilled in the art.

[0025] In one specific embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the system includes a filter box 1, a purification tower 2, and a transfer pump 3. A partition 4 is fixedly connected inside the filter box 1, dividing it into two filter chambers 5. Each filter chamber 5 has an inlet 6 and an outlet 7 fixedly connected to its top and bottom, respectively. Valves 24 are installed on both the inlet 6 and outlet 7. The bottom ends of the two outlets 7 are connected to the liquid inlet of the transfer pump 3, and the liquid outlet of the transfer pump 3 is connected to the purification tower 2, thus enabling the filtered waste liquid to be transported to the purification tower 2. The internal structure and working principle of the purification tower 2 are existing technologies and will not be described in detail here. A filter assembly is inserted into the inner wall of each filter chamber 5, and a cleaning port 8 is opened on the side wall of the filter chamber 5 opposite one end of the filter assembly. It should be noted that the two inlets 6 are connected to an NMP waste liquid discharge device via pipes and tee fittings, and the two outlets are connected to the liquid inlet of the transfer pump 3 via pipes and tee fittings. By controlling the switching of valves 24 in the two filter chambers 5, the filter components in the other filter chamber 5 can be turned on while the filter components in one filter chamber 5 are being cleaned.

[0026] In one specific embodiment of this utility model, such as Figure 2 and Figure 4 As shown, the filter assembly includes a fixed frame 9, with a filter screen 10 fixedly connected to the middle of the fixed frame 9. A baffle 11 is fixedly connected to the top surface of the fixed frame 9, and the side wall of the baffle 11 is flush with the side wall of the fixed frame 9. The filter screen 10 can filter impurities in NMP waste liquid, and the baffle 11 can block the impurities filtered down from the filter screen 10, preventing impurities from spilling when the entire filter assembly is disassembled from the filter box 1.

[0027] Specifically, each filter chamber 5 has symmetrically arranged grooves 12 on its inner walls at both ends, communicating with the cleaning port 8. The side walls at both ends of the fixing frame 9 and the sides of the baffle 11 are inserted into the grooves 12. The grooves 12 provide insertion guides for the fixing frame and the baffle 11, facilitating the assembly and disassembly of the filter components. It should be noted that the filter box 1, filter chamber 5, and fixing frame 9 are all rectangular structures. The inner wall of the filter chamber 5 facing the cleaning port 8 has slots (not shown in the figure) communicating with the grooves 12, so that the fixing frame 9 and the baffle 11 can be inserted into the slots, avoiding gaps between the fixing frame 9 and the baffle 11 and the inner wall of the filter chamber 5, which would affect the filtration effect.

[0028] In one specific embodiment of this utility model, such as Figure 2 , Figure 3 and Figure 4 As shown, the outer wall of the filter box 1 has an installation groove 13 surrounding the cleaning port 8, and a first sealing strip 14 is fixedly connected inside the installation groove 13. A sealing plate 15 adapted to the installation groove 13 is fixedly connected to the outer wall of one end of the baffle 11, and a second sealing strip 16 that cooperates with the first sealing strip 14 is fixedly connected to the inner wall of the sealing plate 15. When the filter assembly is inserted into place, the sealing plate 15 is embedded in the installation groove 13, and the first sealing strip 14 and the second sealing strip 16 fit tightly together to form a double seal, preventing waste liquid from leaking from the cleaning port 8 and ensuring the airtightness of the filter chamber 5.

[0029] Specifically, a pressure rod 17 is rotatably connected to the side wall of the filter box 1 above both ends of each cleaning port 8, and a limiting component is provided on the side wall of the filter box 1 below both ends of the cleaning port 8 corresponding to the pressure rod 17. The limiting component is used to fix the pressure rod 17.

[0030] By rotating the pressure rods 17 at both ends of the cleaning port 8 so that they are vertically downward and connected to the outer wall of the sealing plate 15, the sealing plate 15 is pressed and fixed. Then, the pressure rods 17 are fixed by the limiting parts to prevent the sealing plate 15 from being dislodged from the mounting groove 13 due to the impact of waste liquid on the filter assembly, thereby losing its sealing function on the cleaning port 8.

[0031] Specifically, the limiting component includes two clamping plates 18, one of which has a first limiting hole 19 through it, and one end of the pressure rod 17 has a second limiting hole 20 that is adapted to the first limiting hole 19 through it. The pressure rod 17 is fixed to the clamping plate 18 by passing through the first limiting hole 19 and the second limiting hole 20 in sequence via the limiting rod 21.

[0032] Specifically, a first magnet 22 is fixedly connected to the inner wall of the other clamping plate 18 opposite to the first limiting hole 19, and a second magnet 23 with opposite magnetism to the first magnet 22 is fixedly connected to the top of the limiting rod 21. When the limiting rod 21 is inserted into the limiting hole, the first magnet 22 and the second magnet 23 attract each other, preventing the limiting rod 21 from falling out of the first limiting hole 19 and the second limiting hole 20, thereby ensuring the fixation of the pressure rod 17.

[0033] Working principle of this utility model: When using the NMP waste liquid recovery device of this utility model, firstly, connect the two inlets 6 to the NMP waste liquid outflow equipment through pipes and tee fittings. Then, open the valves 24 of the inlet 6 and outlet 7 of one filter chamber 5, while keeping the valves 24 of the inlet 6 and outlet 7 of the other filter chamber 5 closed. After the NMP waste liquid is filtered by the filter screen 10 of the filter assembly, it is transported from the outlet 7 to the purification tower 2 by the transfer pump 3 for purification of the NMP waste liquid. When the filter assembly of the filter chamber 5 needs cleaning, close the valves 24 of its inlet 6 and outlet 7, and simultaneously open the valves 24 of the inlet and outlet 7 of the other filter chamber 5, switching the waste liquid to the other filter chamber 5 for filtration.

[0034] Then pull out the limiting rod 21, rotate the pressure rod 17 to the sealing plate 15, and pull the filter assembly out from the cleaning port 8 through the baffle 11 to clean or replace the filter assembly. After cleaning, reinsert the filter assembly from the cleaning port 8 so that the sealing plate 15 is embedded in the mounting groove 13. Rotate the pressure rod 17 and insert the limiting rod 21 to fix it, thus completing the replacement of the filter assembly. It can then be used when switching the filter chamber 5 next time.

[0035] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0036] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. An NMP waste liquid recovery device, characterized in that: The system includes a filter box (1), a purification tower (2), and a transfer pump (3); a partition (4) is fixedly connected inside the filter box (1), which divides the filter box (1) into two filter chambers (5); each filter chamber (5) has an inlet (6) and an outlet (7) fixed and connected to its top and bottom, respectively, and valves (24) are provided on the inlet (6) and outlet (7). The bottom ends of the two outlets (7) are connected to the liquid inlet of the transfer pump (3), and the liquid outlet of the transfer pump (3) is connected to the purification tower (2); a filter assembly is inserted into the inner wall of each filter chamber (5), and a cleaning port (8) is opened on the side wall of the filter chamber (5) opposite to one end of the filter assembly.

2. The NMP waste liquid recovery device according to claim 1, characterized in that: The filter assembly includes a fixed frame (9), and a filter screen (10) is fixedly connected to the middle position of the fixed frame (9).

3. The NMP waste liquid recovery device according to claim 2, characterized in that: A baffle (11) is fixedly connected to the top surface of the fixed frame (9), and the side wall of the baffle (11) is flush with the side wall of the fixed frame (9).

4. The NMP waste liquid recovery device according to claim 3, characterized in that: Each of the filter chambers (5) has a groove (12) symmetrically opened on the inner wall at both ends, which communicates with the cleaning port (8). The side walls at both ends of the fixed frame (9) and the two sides of the baffle (11) are inserted into the groove (12).

5. The NMP waste liquid recovery device according to claim 4, characterized in that: The filter box (1) has an installation groove (13) around the cleaning port (8) on its outer wall. A first sealing strip (14) is fixedly connected in the installation groove (13). A sealing plate (15) that matches the installation groove (13) is fixedly connected to the outer wall of one end of the baffle (11). A second sealing strip (16) that cooperates with the first sealing strip (14) is fixedly connected to the inner wall of the sealing plate (15).

6. The NMP waste liquid recovery device according to claim 5, characterized in that: A pressure rod (17) is rotatably connected to the side wall of the filter box (1) above both ends of each cleaning port (8). A limiting member is provided on the side wall of the filter box (1) below both ends of the cleaning port (8) corresponding to the pressure rod (17). The limiting member is used to fix the pressure rod (17).

7. The NMP waste liquid recovery device according to claim 6, characterized in that: The limiting component includes two clamping plates (18), one of which has a first limiting hole (19) through it, and one end of the pressure rod (17) has a second limiting hole (20) that is adapted to the first limiting hole (19). The pressure rod (17) is fixed to the clamping plate (18) by passing through the first limiting hole (19) and the second limiting hole (20) in sequence through the limiting rod (21).

8. The NMP waste liquid recovery device according to claim 7, characterized in that: Another clamp (18) is fixedly connected to the inner wall of the first limiting hole (19) with a first magnet (22), and the top of the limiting rod (21) is fixedly connected to a second magnet (23) with the opposite magnetism to the first magnet (22).

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