Magnetic liquid seal

Abstract

The application discloses a magnetic liquid sealing device, which comprises a reaction kettle, a feeding pipe is connected to the reaction kettle, and a discharging disc is communicated with the feeding pipe and used for placing lithium fluoride powder and making the lithium fluoride powder enter the reaction kettle to react. A plurality of groups of discharging holes are equidistantly arranged in the bottom of the discharging disc. A discharging unit is adopted, so that when the lithium fluoride is discharged, the lithium fluoride can be first discharged through the bottom of a discharging ring, then the lithium fluoride can be secondly discharged into an annular cavity through a through hole and then thirdly discharged through a discharging groove by a guide plate, so that the lithium fluoride powder can uniformly react in the reaction kettle. Therefore, the problem that the existing lithium fluoride powder is not uniformly reacted due to concentrated discharging is effectively solved.

Description

Technical Field

[0001] This application relates to the field of magnetic liquid technology, and more particularly to a magnetic liquid sealing device. Background Technology

[0002] Liquid lithium hexafluorophosphate is an important electrolyte material widely used in lithium-ion batteries.

[0003] The organic solvent method involves dissolving the raw materials required for the preparation of lithium hexafluorophosphate in an organic solvent to prepare liquid lithium hexafluorophosphate. Such solvents generally require good solubility and dispersibility, such as anhydrous acetonitrile, carbonates, ethylene glycol dimethyl ether, anhydrous diethyl ether, pyridine, tetrahydrofuran, etc. Lithium hexafluorophosphate is prepared by reacting lithium fluoride with phosphorus pentafluoride in an organic inert solvent.

[0004] The production steps of liquid lithium hexafluorophosphate are as follows: First, prepare raw materials: prepare hexafluorophosphate according to the formula; Second, mix and react: react lithium fluoride with phosphorus pentafluoride to prepare lithium hexafluorophosphate. The reaction temperature and pressure should not be too high, and the temperature and stirring intensity should be controlled; Third, extraction process: after the reaction is completed, dissolve lithium hexafluorophosphate in an organic solvent, stir the solvent, and then pass it through a precision filter made of PTFE material; Fourth, purification treatment: remove impurities through multiple recrystallization, filtration, washing and other purification treatments to improve the purity and quality of the product and ensure that it meets the physicochemical properties.

[0005] The reaction of lithium fluoride and phosphorus pentafluoride to prepare lithium hexafluorophosphate is carried out in a closed device, usually a reaction vessel, and relatively pure lithium hexafluorophosphate can only be obtained by isolating it from the outside air.

[0006] However, during the implementation of the relevant technical solutions, at least the following technical problems were found: the lithium fluoride used in the reaction is in powder form with particles smaller than a mesh, and the phosphorus pentafluoride is added to the reaction solution by bubbling after being vaporized. The fact that the lithium fluoride is in powder form makes it difficult to evenly sprinkle it on the liquid surface during the feeding process, which can easily lead to uneven mixing during the reaction. Furthermore, the powder will adhere to the inner wall during the mixing process, affecting the reaction rate of both. Summary of the Invention

[0007] This application provides a magnetic liquid sealing device that solves the problem of uneven mixing between lithium fluoride and phosphorus pentafluoride in the prior art, achieving uniform mixing while scraping off residues on the inner wall of the reactor.

[0008] This application provides a magnetic liquid sealing device, including a reaction vessel with a feed pipe connected inside. It further includes: a feeding tray connected to the feed pipe for placing lithium fluoride powder and allowing it to enter the reaction vessel for reaction; multiple sets of feeding holes are equidistantly provided at the bottom of the feeding tray; a feeding unit located within the feeding tray for uniformly discharging lithium fluoride at equal intervals, with the upper liquid surface of the reaction vessel as the plane; the feeding unit includes: a feeding assembly connected to the feeding tray for discharging lithium fluoride powder into the reaction vessel at equal intervals; a cleaning assembly located within the feeding assembly for cleaning lithium fluoride powder adhering to the feeding assembly; and a stirring unit connected to the feeding assembly for thoroughly stirring the lithium fluoride powder and phosphorus pentafluoride in the reaction vessel while cleaning the inner wall of the reaction vessel.

[0009] Furthermore, the stirring unit includes: a stirring assembly disposed inside the reactor for stirring the contents of the reactor; and a moving assembly connected to the stirring assembly for stirring the contents of the reactor while simultaneously scraping off lithium fluoride and phosphorus pentafluoride from the inner wall of the reactor.

[0010] Further, the feeding assembly includes: a feeding ring, which is disposed within a feeding tray and forms an annular cavity with the feeding tray; a through hole is provided on the inner wall of the feeding ring, and a leakage hole is provided at the bottom of the feeding ring through the feeding tray; the through hole is used to allow lithium fluoride powder to enter the annular cavity by being swung; a separator, which is provided in multiple sets at equal intervals along the circumference of the feeding ring to separate the lithium fluoride powder passing through the through hole; a feeding trough, which is provided on the feeding tray near the feeding hole to allow the lithium fluoride powder to fall; and a guide plate, which is connected to the bottom of the feeding trough to receive the lithium fluoride powder falling through the feeding trough and guide it into the reactor.

[0011] Furthermore, the diameter of the guide plate increases sequentially along its height direction.

[0012] Furthermore, a cut surface is provided between the separator and the inner wall of the feeding tray, and the cut surface is used to scrape the inner wall of the feeding tray.

[0013] Furthermore, the cleaning assembly includes: a cleaning blade, which is disposed on a guide plate and tangent to the surface of the guide plate; an extension plate, which is provided at the bottom of the guide plate; a toothed groove, which is provided in multiple sets along the circumferential direction of the extension plate; and a moving gear, which meshes with the toothed groove and whose shaft is connected to the cleaning blade, and is driven by a first power device.

[0014] Furthermore, the stirring assembly includes: a stirring shaft, which is coaxially connected to the feeding ring and is hollow, and is driven by a second power device; a stirring rod, which is provided in multiple sets along the circumference of the stirring shaft; and stirring blades, which are connected to the stirring rods and are used to rotate together with the stirring shaft to stir lithium fluoride and phosphorus pentafluoride.

[0015] Furthermore, the moving component includes: a scraper connected to a stirring rod; a connecting block connecting two adjacent sets of stirring rods; a threaded rod disposed inside the stirring shaft, and the connecting block being threadedly connected to the threaded rod; and a moving groove provided on the stirring shaft to match the stirring rod.

[0016] Furthermore, the top of the threaded rod is provided with a dispersion block, and the top of the dispersion block is provided with a raised arc-shaped structure for dispersing lithium fluoride.

[0017] Furthermore, multiple sets of stirring blades are arranged along the length of the stirring rod.

[0018] The technical solution provided in this application has at least the following technical effects or advantages:

[0019] This application employs a feeding unit, which allows lithium fluoride to be fed in the following ways: firstly, it is fed through the bottom of the feeding ring; secondly, it is fed through the through hole into the annular cavity and then through the feeding hole in the feeding tray; and finally, it is fed through the feeding trough and guide plate. This ensures that the lithium fluoride powder reacts evenly in the reactor, thus effectively solving the problem of uneven reaction caused by concentrated feeding of lithium fluoride powder in existing reactors. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure in Embodiment 1 of this application;

[0021] Figure 2 This is a schematic diagram of the overall cross-section of Embodiment 1 of this application;

[0022] Figure 3 This is a structural schematic diagram of the overall section from another angle in Embodiment 1 of this application;

[0023] Figure 4 This is a structural schematic diagram of a cross-section of the feeding tray in Embodiment 1 of this application;

[0024] Figure 5 This is a top view of the cross-sectional structure of the feeding tray in Embodiment 1 of this application;

[0025] Figure 6 For this application Figure 5Enlarged structural diagram at point A;

[0026] Figure 7 This is a schematic diagram of the guide plate structure in Embodiment 1 of this application;

[0027] Figure 8 This is a structural schematic diagram of the guide plate from another angle in Embodiment 1 of this application;

[0028] Figure 9 This is a schematic diagram of the bottom structure of the guide plate in Embodiment 1 of this application;

[0029] Figure 10 This is a schematic diagram of the stirring assembly in Embodiment 2 of this application;

[0030] Figure 11 This is a schematic diagram of the structure of the moving component in Embodiment 2 of this application.

[0031] In the diagram: 100, Reactor; 101, Feed pipe; 10, Feeding tray; 1, Feeding unit; 11, Feeding assembly; 111, Feeding ring; 112, Annular cavity; 113, Through hole; 114, Leakage hole; 115, Separator; 116, Feeding trough; 117, Guide plate; 118, Cut surface; 12, Cleaning assembly; 121, Cleaning knife; 122, Extension plate; 123, Gear groove; 124, Moving gear; 2, Stirring unit; 21, Stirring assembly; 211, Stirring shaft; 212, Stirring rod; 213, Stirring blade; 22, Moving assembly; 221, Scraper; 222, Connecting block; 223, Threaded rod; 224, Moving trough; 225, Dispersion block. Detailed Implementation

[0032] This application discloses a magnetic liquid sealing device. Lithium fluoride powder enters the feeding ring 111 from the feed pipe 101. The feeding ring 111 rotates, causing a portion of the lithium fluoride powder to pass through the through hole 113 into the annular cavity 112. A portion falls into the reaction vessel 100 through the feeding hole 10a on the feeding plate 10, and a portion falls onto the guide plate 117 through the feeding trough 116, where it is guided into the reaction vessel 100, ensuring the lithium fluoride powder falls evenly into the reaction vessel. Inside the reactor 100, the lithium fluoride powder falling into the reactor 100 reacts fully with phosphorus pentafluoride through the rotation of the stirring shaft 211. At the same time, the scraper 221 cleans the inner wall of the reactor 100 while the stirring shaft 211 rotates, thus solving the problems of uneven mixing of lithium fluoride powder in the reactor 100 and residual lithium fluoride powder on the inner wall of the reactor 100. This achieves uniform mixing of lithium fluoride powder while cleaning the lithium fluoride powder adhering to the inner wall of the reactor 100, which helps to increase the reaction rate.

[0033] To better understand the above technical solution, the following will provide a detailed explanation of the above technical solution in conjunction with the accompanying drawings and specific implementation methods.

[0034] Example 1

[0035] Reference Figure 1-3 A magnetic liquid sealing device includes a reaction vessel 100, a feed pipe 101 connected inside the reaction vessel 100, and a feeding tray 10 connected to the feed pipe 101. The feeding tray 10 is used to place lithium fluoride powder and allow it to enter the reaction vessel 100 for reaction. Multiple sets of feeding holes 10a are equally spaced at the bottom of the feeding tray 10. A feeding unit 1 is provided inside the feeding tray 10. The feeding unit 1 is used to uniformly feed lithium fluoride at equal intervals with the upper liquid surface of the reaction vessel 100 as the plane. The feeding unit 1 includes a feeding component 11 connected to the feeding tray 10. The feeding component 11 is used to feed lithium fluoride powder into the reaction vessel 100 at equal intervals. A cleaning component 12 is provided inside the feeding component 11. The cleaning component 12 is used to clean the lithium fluoride powder adhering to the feeding component 11.

[0036] Since the reactor 100 is a sealed space, lithium fluoride powder is fed into the reactor 100 through the feed pipe 101 during the reaction, thus ensuring that the reactor 100 is also in a sealed state during the reaction. The feed pipe 101 can uniformly transport lithium fluoride powder, so that the lithium fluoride powder will not accumulate in the feed tray 10 and cause blockage.

[0037] Reference Figure 4-8The feeding assembly 11 includes a feeding ring 111 fixedly connected within the feeding tray 10, forming an annular cavity 112 between the feeding tray 10 and the feeding ring 111. A through hole 113 is provided on the inner wall of the feeding ring 111, and a leakage hole 114 is provided at the bottom of the feeding ring 111, passing through the feeding tray 10. The through hole 113 is used to allow lithium fluoride powder to enter the annular cavity 112 by being swung. The bottom of the feeding ring 111 is arc-shaped, which allows the lithium fluoride powder entering from the feed pipe 101 to move along the arc shape, concentrating a portion of the lithium fluoride powder within the feeding ring 111. It also prevents the lithium fluoride powder from being completely thrown to the outside by centrifugal force during the rotation of the feeding ring 111. Multiple sets of separator plates 115 are fixedly connected at equal intervals along the circumference of the feeding ring 111. This invention provides six sets of separator plates. However, it is not limited to this. The separator 115 is used to separate the lithium fluoride powder that has passed through the through hole 113, so as to avoid the accumulation of too much or too little lithium fluoride powder in a certain place in the annular cavity 112, which would affect the problem of uneven feeding of lithium fluoride powder in the future. Furthermore, a cut surface 118 is provided between the separator 115 and the inner wall of the feeding tray 10. The cut surface 118 is used to scrape the inner wall of the feeding tray 10. A feeding groove 116 is provided on the feeding tray 10 near the feeding hole 10a. The feeding groove 116 is used to drop the lithium fluoride powder. A guide plate 117 is connected to the bottom of the feeding groove 116. The guide plate 117 is used to receive the lithium fluoride powder that drops through the feeding groove 116 and guide it into the reactor 100. The diameter of the guide plate 117 increases sequentially along its height direction.

[0038] During the feeding process, lithium fluoride powder enters the feeding ring 111 through the feed pipe 101. The feeding ring 111 rotates, causing a portion of the lithium fluoride powder to fall into the reactor 100 through the leakage hole 114 at the bottom of the feeding ring 111. Another portion, due to the centrifugal force of the rotation, passes through the through hole 113 and enters the annular cavity 112 between the rotating disk and the rotating ring. Within the annular cavity 112, a portion of the lithium fluoride powder falls into the reactor 100 through the feeding hole 10a at the bottom of the feeding disk 10, while another portion falls through the feeding trough 116. The bottom of the feeding trough 116 has a guide plate 117, which is funnel-shaped. This guide plate guides the lithium fluoride powder and keeps it at a certain distance from the feeding hole 10a, ensuring that it is evenly distributed within the reactor 100, thus achieving uniform feeding.

[0039] Reference Figure 7-9The cleaning assembly 12 includes a cleaning blade 121 slidably disposed on a guide plate 117 and tangent to the surface of the guide plate 117. An extension plate 122 is fixedly connected to the bottom of the guide plate 117. Multiple sets of toothed grooves 123 are fixedly connected to the circumference of the extension plate 122. A movable gear 124 is meshed on one side of the toothed groove 123, and the axis of the movable gear 124 is connected to the cleaning blade 121. The movable gear 124 is driven by a first power device, preferably a motor. The output end of the motor is fixedly connected to the axis of the movable gear 124, and the motor is equipped with a limit plate. A limit groove matching the limit plate is provided on the extension plate 122, so that the motor can move in a circle along the trajectory of the extension plate 122, thereby enabling the cleaning blade 121 to clean the surface of the guide plate 117.

[0040] Once the material is fed once, the motor can be driven, which drives the moving gear 124 to rotate. The moving gear 124 meshes with the tooth groove 123, causing it to run along the trajectory of the extension plate 122. This allows the cleaning blade 121 to move in a circular motion close to the outer wall of the guide plate 117, cleaning its surface and solving the problem of lithium fluoride powder adhering to the wall.

[0041] Example 2

[0042] Reference Figure 2-3 The feeding assembly 11 is connected to a stirring unit 2. The stirring unit 2 is used to fully stir the lithium fluoride powder and phosphorus pentafluoride in the reactor 100 while cleaning the inner wall of the reactor 100. The stirring unit 2 includes a stirring component 21 disposed in the reactor 100. The stirring component 21 is used to stir the contents of the reactor 100. The stirring component 21 is connected to a moving component 22. The moving component 22 is used to stir the contents of the reactor 100 while scraping off the lithium fluoride and phosphorus pentafluoride on the inner wall of the reactor 100.

[0043] Reference Figure 10-11 The stirring assembly 21 includes a stirring shaft 211 coaxially connected to the feeding ring 111, and the stirring shaft 211 is hollow. The stirring shaft 211 is driven by a second power device, preferably a motor. Multiple stirring rods 212 are provided along the circumference of the stirring shaft 211. The stirring rods 212 are connected to stirring blades 213. The stirring blades 213 are used to rotate together with the stirring shaft 211 to stir lithium fluoride and phosphorus pentafluoride.

[0044] When in use, the stirring shaft 211 is coaxially connected with the feeding ring 111. The stirring shaft 211 rotates at the same time as the feeding ring 111 rotates. During the rotation, a portion of the lithium fluoride powder inside the feeding ring 111 will pass through the hollow stirring shaft 211 and fall into the reactor 100. The stirring shaft 211 will drive the stirring rod 212 and the stirring blade to rotate together, thereby improving the stirring effect.

[0045] Reference Figure 10-11 The moving component 22 includes a scraper 221 connected to the stirring rod 212. Two adjacent sets of stirring rods 212 are connected by a connecting block 222. The stirring shaft 211 is provided with a threaded rod 223, and the connecting block 222 is threadedly connected to the threaded rod 223. The stirring shaft 211 is provided with a moving groove 224 that matches the stirring rod 212.

[0046] When the stirring shaft 211 rotates, the stirring rod 212 rotates together with the stirring shaft 211. The connecting block 222 moves upward along the height of the threaded rod 223 as the stirring rod 212 rotates forward. The groove opened on the stirring rod 212 can limit the scraper 221 and also allow the lithium fluoride powder to pass through the hollow stirring shaft 211 and be released outward from the position of the groove. The stirring shaft 211 can rotate in the opposite direction. When rotating in the opposite direction, the scraper 221 can move from top to bottom along the height direction of the threaded rod 223. In this way, the scraper 221 can clean up the lithium fluoride powder that falls on the inner wall of the reactor 100 during the stirring process and incorporate it into the reaction.

[0047] How this application works:

[0048] Lithium fluoride powder enters the feeding ring 111 through the feed pipe 101. The feeding ring 111 rotates, causing a portion of the lithium fluoride powder to pass through the through hole 113 and enter the annular cavity 112. A portion falls into the reactor 100 through the feeding hole 10a on the feeding plate 10, and a portion falls onto the guide plate 117 through the feeding trough 116. Guided by the guide plate 117, the lithium fluoride powder falls into the reactor 100 evenly. The lithium fluoride powder falling into the reactor 100 reacts fully with phosphorus pentafluoride as the stirring shaft 211 rotates. At the same time, the scraper 221 cleans the inner wall of the reactor 100 while the stirring shaft 211 rotates.

[0049] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0050] The above are merely preferred embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present application, based on the technical solution and concept of the present application, should be covered within the scope of protection of the present application.

Claims

1. A magnetic liquid sealing device, comprising a reaction vessel (100), wherein a feed pipe (101) is connected inside the reaction vessel (100), characterized in that, Also includes: The feeding tray (10) is connected to the feed pipe (101) and is used to place lithium fluoride powder and allow it to enter the reaction vessel (100) for reaction. Multiple sets of feeding holes (10a) are equidistantly opened at the bottom of the feeding tray (10). The feeding unit (1) is located in the feeding tray (10) and is used to uniformly feed lithium fluoride at equal intervals with the upper liquid surface of the reactor (100) as the plane. The feeding unit (1) includes: Feeding assembly (11), which is connected to feeding tray (10) and is used to feed lithium fluoride powder into the reactor (100) at equal intervals; Cleaning component (12), which is located inside the feeding component (11), is used to clean the lithium fluoride powder adhering to the feeding component (11); The stirring unit (2) is connected to the feeding assembly (11) and is used to fully stir the lithium fluoride powder and phosphorus pentafluoride in the reactor (100) while cleaning the inner wall of the reactor (100); The stirring unit (2) includes: A stirring assembly (21) is provided inside the reactor (100) for stirring the contents of the reactor (100); The moving component (22) is connected to the stirring component (21) and is used to stir the reactor (100) while scraping off lithium fluoride and phosphorus pentafluoride from the inner wall of the reactor (100); The feeding assembly (11) includes: A feeding ring (111) is disposed inside the feeding tray (10) and forms an annular cavity (112) with the feeding tray (10). A through hole (113) is provided on the inner wall of the feeding ring (111), and a leakage hole (114) is provided at the bottom of the feeding ring (111) through the feeding tray (10). The through hole (113) is used to allow lithium fluoride powder to enter the annular cavity (112) by being swung. Separator (115), wherein multiple sets of separator (115) are provided at equal intervals along the circumferential direction of the feeding ring (111) for separating lithium fluoride powder passing through the through hole (113); The feeding trough (116) is located on the feeding tray (10) near the feeding hole (10a) and is used to drop lithium fluoride powder. A guide plate (117) is connected to the bottom of the feeding trough (116) to receive lithium fluoride powder falling from the feeding trough (116) and guide it into the reactor (100); the diameter of the guide plate (117) increases sequentially along its height. The cleaning component (12) includes: A cleaning blade (121) is disposed on a guide plate (117) and is tangent to the surface of the guide plate (117); Extension plate (122), the bottom of the guide plate (117) is provided with extension plate (122); The toothed groove (123) is provided in multiple sets along the circumferential direction of the extension plate (122); The movable gear (124) meshes with the tooth groove (123), and the axis of the movable gear (124) is connected to the cleaning blade (121). The movable gear (124) is driven by the first power device. The moving component (22) includes: A scraper (221) is connected to a stirring rod (212); Connecting block (222), adjacent sets of stirring rods (212) are connected by connecting block (222); A threaded rod (223) is disposed inside the stirring shaft (211), and the connecting block (222) is threadedly connected to the threaded rod (223); The moving groove (224) is provided on the stirring shaft (211) to match the stirring rod (212).

2. The magnetic liquid sealing device as described in claim 1, characterized in that, A cut surface (118) is provided between the separator (115) and the inner wall of the feeding tray (10), and the cut surface (118) is used to scrape the inner wall of the feeding tray (10).

3. The magnetic liquid sealing device as described in claim 1, characterized in that, The stirring assembly (21) includes: A stirring shaft (211) is coaxially connected to a feeding ring (111), and the stirring shaft (211) is hollow. The stirring shaft (211) is driven by a second power device. A stirring rod (212) is provided in multiple sets along the circumferential direction of the stirring shaft (211); A stirring plate (213) is connected to a stirring rod (212) and is used to rotate together with a stirring shaft (211) to stir lithium fluoride and phosphorus pentafluoride.

4. A magnetic liquid sealing device as described in claim 1, characterized in that, The top of the threaded rod (223) is provided with a dispersion block (225), and the top of the dispersion block (225) is provided with a raised arc-shaped structure for dispersing lithium fluoride.

5. A magnetic liquid sealing device as described in claim 3, characterized in that, The stirring blades (213) are arranged in multiple sets along the length of the stirring rod (212).

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