NMP (N-Methyl Pyrrolidone) purification device

Abstract

The utility model discloses an NMP (N-Methyl Pyrrolidone) purification device which comprises a base, an outer cylinder is arranged at the upper end of the base, a purification inner container is arranged in the outer cylinder, a heating cavity is arranged between the purification inner container and the outer cylinder, and a heater is arranged in the heating cavity; a water collecting cover is arranged above the purification inner container and is driven by a motor to rotate; a water collecting tank is arranged at the upper end of the outer barrel and is annular, an opening is formed in the upper end of the water collecting tank, and the lower hem of the water collecting cover is located in the water collecting tank and controlled to ascend and descend through a lifting mechanism. The water collecting cover is driven by the motor to rotate, water drops condensed on the concave surface of the water collecting cover are thrown into the water collecting tank through centrifugal force, the purification progress of an NMP solution can be observed at any time through the water collecting cover made of glass, the water collecting cover is exposed outside and can exchange heat with the outside, and the water drop collecting capacity is improved; the water collecting cover is driven by the electric telescopic rod to ascend, so that the water collecting cover and the purification liner can be conveniently cleaned.

Description

Technical Field

[0001] The utility model relates to the technical field of NMP purification, in particular to an NMP purification device. Background Art

[0002] In the process of manufacturing materials such as lithium batteries, a large amount of NMP waste liquid is generated. In order to save production costs and maintain the concept of recycling, the NMP solution generated by production needs to be purified.

[0003] In the Chinese new utility patent with announcement number CN 219579881 U, an NMP recovery and purification device is disclosed, which includes an outer box body and an inner box body arranged inside the outer box body, a scraping mechanism and a water collecting cover are provided at the top end of the inner part of the outer box body, and the scraping mechanism includes a first motor, a power output end of the first motor passes through the outer box body and is fixedly connected to a rotating rod, a cleaning plate is provided on the outside of the rotating rod, and a scraper is provided on the surface of one end of the cleaning plate; the utility model has a simple structure. When the purification is about to end, the first motor drives the cleaning plate to rotate through the rotating rod, which can drive the scraper to rotate along the inner wall of the water collecting cover, and the condensed water vapor can be scraped off, so that the water vapor that has not gathered into small droplets can be collected, and at the same time, the water vapor can be prevented from staying on the water collecting cover, so that the water collecting cover can be cleaned. Regarding the above-mentioned related technologies, the inventors believe that the following defects exist: the water collection hood will rapidly increase in temperature after continuously collecting water droplets. Since the water collection hood is arranged inside the outer box, the water collection hood cannot exchange heat with the outside world, which reduces the ability of the water collection hood to collect water droplets, and the purification progress cannot be observed during NMP purification. The water collection hood and the inner box are both enclosed inside the outer box, which is inconvenient to clean them thoroughly. Utility Model Content

[0004] The purpose of the present invention is to provide a NMP purification device to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: an NMP purification device, comprising a base, an outer cylinder provided at the upper end of the base, a purification liner provided inside the outer cylinder, a heating chamber provided between the purification liner and the outer cylinder, and a heater provided in the heating chamber;

[0006] The upper end of the purification liner is provided with an opening, and a water collecting cover is provided above the opening. The concave surface of the water collecting cover corresponds to the opening of the purification liner above and below and does not contact the purification liner. A rotating shaft is provided in the middle of the upper end of the water collecting cover, and the rotating shaft is driven to rotate by a motor;

[0007] A water collecting trough is provided at the upper end of the outer cylinder. The water collecting trough is annular in shape and has an opening at the upper end. The lower hem of the water collecting cover is located in the water collecting trough and is controlled to rise and fall by a lifting mechanism.

[0008] Preferably, the lifting mechanism includes a fixing frame arranged at the upper end of the base, an electric telescopic rod is fixedly mounted on the upper end of the fixing frame, the output direction of the electric telescopic rod is downward, and the output end is fixedly connected to a lifting plate, and the motor and the rotating shaft are mounted on the lifting plate;

[0009] A guide rail is provided on the front of the fixing frame, and the lifting plate is connected to the guide rail in an up-and-down sliding manner.

[0010] Preferably, the heater includes a heating spiral and a heating plate, and a plurality of heating plates are provided and are evenly embedded in the heating spiral.

[0011] Preferably, an outer edge is provided on the outer side of the upper end of the purification liner, an inner edge is provided on the inner side of the upper end of the outer cylinder, the outer edge is located above the inner edge, and a rubber ring is provided between the outer edge and the inner edge.

[0012] Preferably, a plurality of pull rings for taking out the purification liner are provided at the upper end of the outer edge.

[0013] Preferably, a plurality of foot pads for supporting the purification liner are provided at the upper end of the base, the foot pads are located inside the outer cylinder, and the upper ends of the foot pads abut against the bottom of the purification liner.

[0014] Preferably, a drain pipe is provided at the lower end of the water collecting tank.

[0015] Preferably, the water collecting cover is made of glass.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The utility model drives the water collecting cover to rotate by a motor, and the water droplets condensed on the concave surface of the water collecting cover are thrown into the water collecting tank by centrifugal force. The water in the water collecting tank can be discharged through the drain pipe. The purification progress of the NMP solution can be observed at any time through the glass water collecting cover, and the water collecting cover is exposed to the outside and can exchange heat with the outside, thereby increasing the ability to collect water droplets.

[0018] The water collecting hood is driven to rise by an electric telescopic rod, so that the water collecting hood and the purification tank can be easily cleaned. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a front cross-sectional view of the utility model;

[0021] Figure 3 This is a schematic diagram of the purification liner structure of the utility model;

[0022] Figure 4This is a schematic diagram of the heater structure of the present utility model.

[0023] In the figure: 1. Base; 2. Outer cylinder; 3. Purification liner; 4. Heating chamber; 5. Heater; 6. Water collecting cover; 7. Rotating shaft; 8. Motor; 9. Water collecting tank; 10. Fixed frame; 11. Electric telescopic rod; 12. Lifting plate; 13. Guide rail; 14. Outer edge; 15. Inner edge; 16. Rubber ring; 17. Pull ring; 18. Foot pad; 19. Drain pipe; 51. Heating spiral; 52. Heating plate. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] See also Figure 1-4 The utility model provides a technical solution: an NMP purification device, comprising a base 1, an outer cylinder 2 is provided at the upper end of the base 1, a purification liner 3 is provided inside the outer cylinder 2, a heating chamber 4 is provided between the purification liner 3 and the outer cylinder 2, and a heater 5 is provided in the heating chamber 4;

[0026] An opening is provided at the upper end of the purification liner 3, and a water collecting cover 6 is provided above the opening. The water collecting cover 6 is made of glass. A drain pipe 19 is provided at the lower end of the water collecting tank 9. The concave surface of the water collecting cover 6 corresponds to the opening of the purification liner 3 above and below, and does not contact the purification liner 3. A rotating shaft 7 is provided in the middle of the upper end of the water collecting cover 6, and the rotating shaft 7 is driven to rotate by a motor 8;

[0027] A water collecting tank 9 is provided at the upper end of the outer cylinder 2 . The water collecting tank 9 is annular in shape and has an opening at the upper end. The lower hem of the water collecting cover 6 is located in the water collecting tank 9 .

[0028] Among them, the heater 5 heats the NMP solution inside the purification liner 3, so that the temperature of the NMP solution increases and the water therein evaporates. The water evaporates into water vapor and rises to contact the water collecting cover 6 above the purification liner 3, so that the water vapor temperature decreases and attaches to the concave surface of the water collecting cover 6, and gradually forms small water droplets. The small water droplets flow from the concave surface of the water collecting cover 6 to the bottom of the water collecting cover 6 and drip into the water collecting tank 9 for collection. When the purification is carried out in the later stage, the water content in the NMP solution is less, so that the water vapor There is less gas, so the water droplets condense slowly and will hang on the concave surface of the water collecting cover 6 for a long time, affecting the collection of water vapor. At this time, the motor 8 drives the rotating shaft 7 to rotate, so that the water collecting cover 6 rotates, and the centrifugal force throws the water droplets condensed on the concave surface of the water collecting cover 6 into the water collecting tank 9. The water in the water collecting tank 9 can be discharged through the drain pipe 19. The purification progress of the NMP solution can be observed at any time through the glass water collecting cover 6, and the water collecting cover 6 is exposed to the outside and can exchange heat with the outside world, which increases the ability to collect water droplets.

[0029] The heater 5 includes a heating spiral 51 and heating plates 52 . There are a plurality of heating plates 52 , which are evenly embedded in the heating spiral 51 .

[0030] The heater 5 is fixed on the inner side of the outer tube 2. The heating plate 52 can support the heating spiral 51 on the one hand, and on the other hand, the heating spiral 51 and the heating plate 52 cooperate to heat so that the temperature in the heating chamber 4 is more uniform, thereby heating the NMP solution inside the purification liner 3 more evenly.

[0031] The water collecting cover 6 is raised and lowered by a lifting mechanism, which includes a fixing frame 10 provided at the upper end of the base 1. An electric telescopic rod 11 is fixedly mounted on the upper end of the fixing frame 10. The output direction of the electric telescopic rod 11 is downward, and the output end is fixedly connected to a lifting plate 12. The motor 8 and the rotating shaft 7 are mounted on the lifting plate 12.

[0032] A guide rail 13 is provided on the front of the fixing frame 10 , and the lifting plate 12 is connected to the guide rail 13 in an up-and-down sliding manner.

[0033] Among them, the water collecting cover 6 can be raised and lowered by the electric telescopic rod 11, and the purification liner 3 can be taken out, which is convenient for cleaning the purification liner 3 and the water collecting cover 6. By starting the electric telescopic rod 11, the lifting plate 12 fixed at the output end of the electric telescopic rod 11 slides upward on the fixed frame 10, so that the water collecting cover 6 installed under the lifting plate 12 moves upward, and NMP solution can be added to or taken out of the purification liner 3.

[0034] An outer edge 14 is provided on the outer side of the upper end of the purification liner 3, and an inner edge 15 is provided on the inner side of the upper end of the outer tube 2. The outer edge 14 is located above the inner edge 15, and a rubber ring 16 is provided between the outer edge 14 and the inner edge 15;

[0035] The upper end of the outer edge 14 is provided with a plurality of pull rings 17 for taking out the purification liner 3;

[0036] A plurality of foot pads 18 for supporting the purification liner 3 are provided at the upper end of the base 1 . The foot pads 18 are located inside the outer tube 2 , and the upper ends of the foot pads 18 abut against the bottom of the purification liner 3 .

[0037] Among them, multiple pull rings 17 at the upper end of the outer edge 14 can facilitate the removal and placement of the purification liner 3. When the purification liner 3 is placed in the outer tube 2, the rubber ring 16 can seal the outer edge 14 and the inner edge 15 to prevent heat loss inside the heating chamber 4. At the same time, multiple foot pads 18 can support the bottom of the purification liner 3.

[0038] The working principle and use process of this utility model:

[0039] The water collecting cover 6 is lifted by the lifting mechanism, and the NMP solution is added to the purification liner 3. Then, the water collecting cover 6 is lowered so that the bottom of the water collecting cover 6 is located in the water collecting tank 9. The NMP solution inside the purification liner 3 is heated by the heater 5, so that the temperature of the NMP solution is increased and the water therein is evaporated. The water evaporates into water vapor and rises to contact the water collecting cover 6 above the purification liner 3, so that the water vapor temperature is reduced and attached to the concave surface of the water collecting cover 6, and gradually forms small water droplets. The small water droplets flow from the concave surface of the water collecting cover 6 to the bottom of the water collecting cover 6. And it drips into the water collecting tank 9 for collection. When it reaches the later stage of purification, there is less water in the NMP solution, which leads to less water vapor. Therefore, the water droplets condense slowly and will hang on the concave surface of the water collecting cover 6 for a long time, affecting the collection of water vapor. At this time, the motor 8 drives the rotating shaft 7 to rotate, so that the water collecting cover 6 rotates, and the water droplets condensed on the concave surface of the water collecting cover 6 are thrown into the water collecting tank 9 by centrifugal force. The water in the water collecting tank 9 can be discharged through the drain pipe 19. The electric telescopic rod 11 drives the water collecting cover 6 to rise, which can facilitate the cleaning of the water collecting cover 6 and the purification liner 3.

[0040] Although the 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 variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An NMP purification device, comprising a base (1), characterized in that: An outer cylinder (2) is provided at the upper end of the base (1), a purification liner (3) is provided inside the outer cylinder (2), a heating chamber (4) is provided between the purification liner (3) and the outer cylinder (2), and a heater (5) is provided in the heating chamber (4); The upper end of the purification liner (3) is provided with an opening, and a water collecting cover (6) is provided above the opening. The concave surface of the water collecting cover (6) corresponds to the upper and lower opening of the purification liner (3) and does not contact the purification liner (3). A rotating shaft (7) is provided in the middle of the upper end of the water collecting cover (6), and the rotating shaft (7) is driven to rotate by a motor (8); The upper end of the outer cylinder (2) is provided with a water collecting trough (9), the water collecting trough (9) is annular in shape and has an opening at the upper end. The lower part of the water collecting cover (6) is located in the water collecting trough (9) and is controlled to rise and fall by a lifting mechanism.

2. a kind of NMP purification device according to claim 1, is characterized in that: The lifting mechanism comprises a fixing frame (10) arranged at the upper end of the base (1); an electric telescopic rod (11) is fixedly mounted on the upper end of the fixing frame (10); the output direction of the electric telescopic rod (11) is downward, and the output end is fixedly connected to a lifting plate (12); the motor (8) and the rotating shaft (7) are mounted on the lifting plate (12); A guide rail (13) is provided on the front of the fixing frame (10), and the lifting plate (12) is connected to the guide rail (13) in an up-and-down sliding manner.

3. a kind of NMP purification device according to claim 1, is characterized in that: The heater (5) comprises a heating spiral (51) and a heating plate (52). A plurality of heating plates (52) are provided and are evenly embedded in the heating spiral (51).

4. a kind of NMP purification device according to claim 1, is characterized in that: An outer edge (14) is provided on the outer side of the upper end of the purification liner (3), and an inner edge (15) is provided on the inner side of the upper end of the outer cylinder (2). The outer edge (14) is located above the inner edge (15), and a rubber ring (16) is provided between the outer edge (14) and the inner edge (15).

5. a kind of NMP purification device according to claim 4, is characterized in that: The upper end of the outer edge (14) is provided with a plurality of pull rings (17) for taking out the purification liner (3).

6. a kind of NMP purification device according to claim 1, is characterized in that: The upper end of the base (1) is provided with a plurality of foot pads (18) for supporting the purification liner (3); the foot pads (18) are located inside the outer cylinder (2); and the upper ends of the foot pads (18) abut against the bottom of the purification liner (3).

7. A NMP purification device according to claim 1, characterized in that: A drainage pipe (19) is provided at the lower end of the water collecting tank (9).

8. a kind of NMP purification device according to claim 1, is characterized in that: The water collecting cover (6) is made of glass.

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