NMP (N-Methyl Pyrrolidone) solution demagnetizing device

Abstract

The utility model relates to an NMP (N-Methyl Pyrrolidone) solution demagnetizing device and belongs to the technical field of NMP demagnetizing. The device comprises a plurality of demagnetizing units which are sequentially communicated in series through a connecting pipeline; the demagnetizing unit comprises a magnetic bar, a sleeve and a shell; the sleeve sleeves the periphery and the bottom of the magnetic bar; the outer shell is arranged on the periphery and the bottom of the sleeve in a sleeving mode. A protruding liquid inlet is formed in the bottom of the shell, and a protruding liquid outlet is formed in the position, close to the top, of the side face of the shell. A columnar pin is arranged on the side surface of the magnetic bar close to the top; and a transition annular groove matched with the columnar pin is formed in the corresponding position of the inner wall of the sleeve. According to the NMP solution demagnetizing device provided by the utility model, multi-stage demagnetizing is formed through the plurality of demagnetizing units, so that the demagnetizing effect of the flowing NMP solution is ensured; and the columnar pin and the transition annular groove form a clamping mechanism, so that the magnetic bar and the sleeve can be quickly connected and detached, the cleaning difficulty of magnetic substances adsorbed on the outer side of the sleeve is reduced, and the demagnetizing efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of NMP demagnetization technology and relates to an NMP solution demagnetization device. Background Technology

[0002] NMP (N-methylpyrrolidone) solution is an excellent high-grade solvent with high selectivity, strong stability, and good polarity, and is widely used in high-precision electronics, circuit boards, lithium batteries, and other fields. Especially in the lithium battery production process, NMP is often used as a cleaning solvent, and is particularly important in the manufacture of positive and negative electrode materials and separators for lithium batteries. NMP solutions must not contain metallic substances; therefore, demagnetization treatment is required during production. Traditional NMP demagnetization generally uses a pipeline-type permanent magnet separator, but its magnetic field strength is relatively weak, and its demagnetization capacity is limited. Furthermore, magnetic materials easily adhere to the magnetic rod, requiring regular manual disassembly and cleaning. Incomplete cleaning may result in magnetic material residue, affecting product quality. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an NMP solution demagnetizing device that can reduce the difficulty of cleaning magnetic materials adhering to magnetic rods and improve demagnetizing efficiency.

[0004] To achieve the above objectives, this utility model employs the following technical solution:

[0005] This invention provides an NMP solution demagnetizing device, which includes multiple demagnetizing units connected in series via connecting pipelines.

[0006] The demagnetizing unit includes a magnetic rod, a sleeve, and a housing;

[0007] The sleeve is fitted around the outer periphery and bottom of the magnetic rod;

[0008] The outer shell is fitted around the outer periphery and bottom of the sleeve;

[0009] The bottom of the outer casing has a raised liquid inlet, and the side near the top has a raised liquid outlet.

[0010] Furthermore, multiple demagnetizing units are connected in series via a drain port and a liquid inlet, with the drain port of the previous demagnetizing unit connected to the liquid inlet of the next demagnetizing unit.

[0011] Furthermore, the magnetic rod includes a main body and a sealing part;

[0012] The main body is a cylindrical structure with a height much greater than the diameter of the bottom surface;

[0013] The sealing part is a cylindrical structure with a height much smaller than the diameter of the bottom surface;

[0014] The lower end of the sealing part is fixedly connected to the upper end of the main body part;

[0015] A handle is provided at the upper end of the sealing part.

[0016] Furthermore, a columnar pin is provided on the side of the main body near the top, and a transition annular groove that mates with the columnar pin is provided on the inner wall of the sleeve, with the groove of the transition annular groove decreasing in depth.

[0017] Furthermore, the sleeve is provided with a first extension portion;

[0018] The first extension portion is a circular ring structure, which is fitted onto the top side of the sleeve;

[0019] The outer diameter of the first extension is larger than the diameter of the circular opening at the top of the outer shell, so as to support the sleeve and prevent its bottom from contacting the outer shell.

[0020] Furthermore, the outer shell is provided with a second extension portion;

[0021] The second extension is a ring-shaped structure that fits onto the top side of the outer shell.

[0022] Furthermore, the bottom diameter of the sealing portion, the outer circumferential diameter of the first extension portion, and the outer circumferential diameter of the second extension portion are equal;

[0023] The demagnetizing unit also includes an i-shaped sealing chuck for clamping the first extension portion, the second extension portion, and the sealing portion.

[0024] Furthermore, both the liquid inlet and the liquid outlet of the outer casing are equipped with valves.

[0025] Furthermore, the magnetic rod is made of permanent magnet material.

[0026] Furthermore, the sleeve is made of one of the following materials: 304 stainless steel, 316L stainless steel, PE, PP, or PTFE.

[0027] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0028] The NMP solution demagnetizing device provided by this utility model forms a multi-stage demagnetizing mechanism through multiple demagnetizing units connected in series, ensuring the demagnetizing effect on the flowing NMP solution; the columnar pin on the magnetic rod and the corresponding transition annular groove on the inner wall of the sleeve form a snap-fit ​​mechanism, realizing the quick connection and disassembly of the magnetic rod and the sleeve, reducing the difficulty of cleaning the magnetic material adsorbed on the outer wall of the sleeve, and improving the demagnetizing efficiency. Attached Figure Description

[0029] Figure 1This is a schematic diagram of the structure of an NMP solution demagnetizing device provided in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the demagnetizing unit in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the transition annular groove and columnar pin in the embodiment of this utility model, as well as a schematic diagram of the snap-fit ​​between the magnetic rod and the outer shell.

[0032] In the diagram, 1: magnetic rod; 2: outer shell; 3: sleeve; 4: handle; 5: sealing chuck; 6: drain port; 7: inlet port; 8: transition annular groove; 9: columnar pin. Detailed Implementation

[0033] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. The same reference numerals in the drawings indicate the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. The embodiments and specific features within the embodiments of this application are detailed descriptions of the technical solution of this application, and not limitations thereof. Where there is no conflict, the embodiments and technical features within the embodiments of this application can be combined with each other.

[0034] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are 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. Furthermore, the term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] like Figure 1 As shown, this utility model embodiment provides an NMP solution demagnetizing device, which includes multiple demagnetizing units connected in series via connecting pipelines;

[0037] The demagnetizing unit includes a magnetic rod 1, a sleeve 3, and a housing 2;

[0038] The sleeve 3 is fitted around the outer periphery and bottom of the magnetic rod 1;

[0039] The outer shell 2 is fitted around the outer periphery and bottom of the sleeve 3;

[0040] The bottom of the outer casing 2 is provided with a protruding liquid inlet 7, and the side near the top is provided with a protruding liquid outlet 6.

[0041] Multiple demagnetizing units are connected in series via drain ports 6 and inlets 7 on the outer casing 2 to form a multi-stage demagnetizing structure, ensuring that magnetic substances in the NMP solution are completely adsorbed by the magnetic rods 1. Specifically, the drain port 6 of the previous stage demagnetizing unit is connected to the inlet 7 of the next stage demagnetizing unit. The NMP solution is pumped from the finished product tank into the inlet 7 of the first stage demagnetizing unit through a shielded pump or other equipment. After being filtered through multiple stages of demagnetizing units, it flows out from the drain port 6 of the last stage demagnetizing unit. The drain port 6 of the last stage demagnetizing unit is connected to a precision filter, and the NMP solution is further filtered to remove particulate matter before entering the tank truck or packaging drum.

[0042] In this embodiment of the invention, four demagnetizing units are provided to perform four-stage demagnetization.

[0043] like Figure 2 As shown, the magnetic rod 1 includes a main body and a sealing part; the main body is a cylindrical structure with a height much greater than the diameter of the bottom surface; the sealing part is a cylindrical structure with a height much smaller than the diameter of the bottom surface; the lower end of the sealing part is fixedly connected to the upper end of the main body, and a handle 4 is provided at the upper end of the sealing part.

[0044] The main body of the magnetic rod 1 of this invention is made of permanent magnet material. When the NMP solution flows through the outer wall of the sleeve 3, the magnetic rod 1 inside the sleeve 3 generates a strong magnetic field, and the magnetic material is adsorbed onto the outer wall of the sleeve 3.

[0045] like Figure 3 As shown, a columnar pin 9 is provided on the side of the main body of the magnetic rod 1 near the top, and a transition annular groove 8 that can cooperate with the columnar pin 9 is provided on the inner wall of the sleeve 3 at the corresponding position. The transition annular groove 8 occupies one-quarter of the circumference of the sleeve 3, and its groove is from deep to shallow.

[0046] When connecting the magnetic rod 1 and the sleeve 3, the magnetic rod 1 is placed into the sleeve 3 using the handle 4 until the columnar pin 9 is at the same height as the transition annular groove 8. The magnetic rod 1 is rotated by the handle 4, so that the columnar pin 9 enters the groove from the deepest part of the groove in the transition annular groove 8. The increasingly shallow groove will lock the columnar pin 9, thus fixing the magnetic rod 1 and the sleeve 3.

[0047] When disassembling the magnetic rod 1 and the sleeve 3, rotate the magnetic rod 1 in the opposite direction so that the columnar pin 9 leaves the transition annular groove 8.

[0048] In this embodiment of the invention, two columnar pins 9 are provided in opposite positions.

[0049] The sleeve 3 is provided with a first extension portion, which is a circular ring structure and is fixedly sleeved on the top of the outer side of the sleeve 3.

[0050] The outer diameter of the first extension is larger than the diameter of the circular opening at the top of the outer shell 2, so as to support the sleeve 3 and prevent its bottom from contacting the outer shell 2.

[0051] A space needs to be left between the sleeve 3 and the outer shell 2 to allow the NMP solution to flow.

[0052] The outer shell 2 is provided with a second extension portion, which is a circular ring structure and is fitted onto the top side of the outer shell 2.

[0053] Furthermore, the bottom diameter of the sealing part, the outer circumferential diameter of the first extension part, and the outer circumferential diameter of the second extension part are equal, and the first extension part, the second extension part, and the sealing part are clamped by the C-shaped sealing chuck 5 to ensure the internal sealing of the NMP solution demagnetizing device of this utility model.

[0054] To ensure the airtightness of the demagnetizing device, the opening length of the C-shaped sealing chuck 5 should be as consistent as possible with the total thickness of the first extension, the second extension and the sealing part, and each demagnetizing unit should be equipped with at least two sealing chucks 5.

[0055] The sleeve 3 is used to protect the main body of the magnetic rod 1 from chemical corrosion and to prevent magnetic materials from adhering directly to the magnetic rod 1. Therefore, the sleeve 3 is made of corrosion-resistant and pressure-resistant metal or non-metal materials, including 304 stainless steel, 316L stainless steel, PE, PP or PTFE, etc.

[0056] The outer shell 2 is shaped like a test tube, with a hollow cylindrical body. It has a circular opening at the top, a second extension at the opening, and a circular depression at the bottom.

[0057] Both the liquid inlet 7 and the liquid outlet 6 of the outer casing 2 are equipped with valves.

[0058] During operation, the NMP solution flows through the sleeve 3, generating a strong magnetic field in the main body of the magnetic rod 1 inside the sleeve 3. Magnetic material is then attracted to the outer wall of the sleeve 3. When a certain amount of magnetic material accumulates on the outer wall of the sleeve 3, the valves at the inlet 7 and outlet 6 on the outer casing 2 are closed. The sealing chuck 5 is removed, and the sleeve 3 and magnetic rod 1 are taken out from the outer casing 2. The magnetic rod 1 is rotated to detach the sleeve 3 from it, and the non-magnetic sleeve 3 is cleaned. After cleaning, the magnetic rod 1 is reinstalled into the sleeve 3, and then both are placed back into the outer casing 2. The sealing chuck 5 is then installed, and the valves at the inlet 7 and outlet 6 on the outer casing 2 are opened to continue the demagnetization operation.

[0059] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the scope of protection of this disclosure / application.

Claims

1. An NMP solution demagnetizing device, characterized in that, include: Multiple demagnetizing units are connected in series via connecting pipes; The demagnetizing unit includes a magnetic rod, a sleeve, and a housing; The sleeve is fitted around the outer periphery and bottom of the magnetic rod; The outer shell is fitted around the outer periphery and bottom of the sleeve; The bottom of the outer casing has a raised liquid inlet, and the side near the top has a raised liquid outlet.

2. The NMP solution demagnetizing device according to claim 1, characterized in that, Multiple demagnetizing units are connected in series via a drain port and a liquid inlet, with the drain port of the previous demagnetizing unit connected to the liquid inlet of the next demagnetizing unit.

3. The NMP solution demagnetizing device according to claim 1, characterized in that, The magnetic rod includes a main body and a sealing part; The main body is a cylindrical structure with a height much greater than the diameter of the bottom surface; The sealing part is a cylindrical structure with a height much smaller than the diameter of the bottom surface; The lower end of the sealing part is fixedly connected to the upper end of the main body part; A handle is provided at the upper end of the sealing part.

4. The NMP solution demagnetizing device according to claim 3, characterized in that, A columnar pin is provided on the side of the main body near the top, and a transition annular groove that mates with the columnar pin is provided on the inner wall of the sleeve. The groove of the transition annular groove is from deep to shallow.

5. The NMP solution demagnetizing device according to claim 3, characterized in that, The sleeve is provided with a first extension portion; The first extension portion is a circular ring structure, which is fitted onto the top side of the sleeve; The outer diameter of the first extension is larger than the diameter of the circular opening at the top of the outer shell, so as to support the sleeve and prevent its bottom from contacting the outer shell.

6. The NMP solution demagnetizing device according to claim 5, characterized in that, The outer shell is provided with a second extension portion; The second extension is a ring-shaped structure that fits onto the top side of the outer shell.

7. The NMP solution demagnetizing device according to claim 6, characterized in that, The bottom diameter of the sealing part, the outer peripheral diameter of the first extension part, and the outer peripheral diameter of the second extension part are equal; The demagnetizing unit also includes an i-shaped sealing chuck for clamping the first extension portion, the second extension portion, and the sealing portion.

8. The NMP solution demagnetizing device according to claim 1, characterized in that, Both the liquid inlet and the liquid outlet of the outer casing are equipped with valves.

9. The NMP solution demagnetizing device according to claim 1, characterized in that, The magnetic rod is made of permanent magnet material.

10. The NMP solution demagnetizing device according to claim 1, characterized in that, The sleeve is made of one of the following materials: 304 stainless steel, 316L stainless steel, PE, PP or PTFE.

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