Lithium hydroxide filtering device and lithium hydroxide filtering system

Abstract

The invention relates to the technical field of filtering and impurity removing equipment, in particular to a lithium hydroxide filtering device and a lithium hydroxide filtering system.The lithium hydroxide filtering device comprises a filtering unit, the filtering unit comprises a barrel and a filter element, the barrel and the filter element are detachably connected into the barrel and are coaxial, the filter element comprises filter paper and an inner pipe, and the filter paper is arranged on the periphery of the inner pipe; a liquid outlet hole is formed in the inner pipe; the barrel comprises a barrel body and a liquid inlet pipe and a liquid outlet pipe which are connected to the two axial ends of the barrel body, and the technical scheme has the beneficial effects that the filtering efficiency can be improved in two dimensions, on one hand, the filtering efficiency is improved by improving the convenience of waste removal, namely improving the maintenance efficiency of the device, and on the other hand, the filtering efficiency is improved; and secondly, the circulating efficiency of the medium liquid at the filter paper position is improved through centrifugal filtration, so that the filtering efficiency is improved, and the lithium hydroxide can be efficiently produced.

Description

Technical Field

[0001] The present invention relates to the technical field of filtering and impurity removal equipment, and particularly to a filtering device for lithium hydroxide and a filtering system for lithium hydroxide. Background Art

[0002] In the production process of lithium hydroxide, filtration is a crucial step aimed at removing impurities and insoluble particles in the solution to ensure the purity of the final product. However, traditional filtration methods often have problems such as low efficiency and complex maintenance, which not only limit the production speed but also may affect the product quality.

[0003] Traditional filtering devices adopt a static filtering structure, that is, when the medium liquid passes through the filter medium, filtration is achieved by relying on gravity or a slight pressure difference. This design usually results in a slow filtering speed and low filtering efficiency. The waste generated during the filtering process often adheres to the surface of the filter medium and fills the filtering chamber, resulting in not only the need to replace the filter medium during maintenance but also the need to clean the filtering chamber, reducing the work efficiency. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] In view of the above-mentioned disadvantages and deficiencies of the prior art, the present invention provides a filtering device for lithium hydroxide and a filtering system for lithium hydroxide, which solve the technical problems of inconvenient maintenance and low filtering efficiency of the lithium hydroxide filtering device in the prior art.

[0006] (II) Technical Solutions

[0007] To achieve the above object, the main technical solutions adopted by the present invention include:

[0008] In the first aspect, the present invention provides a filtering device for lithium hydroxide, including a filtering unit. The filtering unit includes a cylinder body and a filter element. The filter element is detachably connected to the inside of the cylinder body and the two are coaxial. The filter element includes filter paper and an inner tube. The filter paper is arranged on the outer periphery of the inner tube, and the inner tube is provided with liquid outlet holes. The cylinder body includes a cylinder body and a liquid inlet pipe and a liquid outlet pipe connected to both axial ends of the cylinder body. One end of the inner tube is a liquid inlet end, the liquid inlet end is communicated with the liquid inlet pipe, and the liquid outlet pipe is communicated with the space between the cylinder body and the filter paper, so that the inner cavity surrounded by the filter element forms a waste cavity; it also includes a housing and a rotation driving member. The rotation driving member is supported on the housing and the driving end of the rotation driving member is connected to the cylinder body. The cylinder body is axially rotatably supported on the housing, so that the cylinder body can rotate axially.

[0009] In a second aspect, the present invention provides a filtration system for lithium hydroxide, which includes the filtration device for lithium hydroxide in the above technical solution, and further includes a sedimentation device and a primary filtration device. The primary filtration device receives the filtrate from the sedimentation device, and the filtration device for lithium hydroxide receives the filtrate from the primary filtration device; the primary filtration device is set as a plate filter or a vacuum belt filter.

[0010] (III) Beneficial effects

[0011] The beneficial effects of the present invention are as follows: For the filtration device and filtration system for lithium hydroxide of the present invention, the lithium hydroxide adopts a cylindrical filtration structure, and the flow direction of the medium liquid is from the inside to the outside, that is, it flows from the inner cylinder through the filter paper and then enters the space between the filter paper and the cylinder body. Therefore, the filter residue will remain inside the filter paper, that is, in the waste cavity. When removing the waste, the filter paper often needs to be replaced. At this time, the filter paper can be replaced as a whole while cleaning out the waste at the same time, which improves the maintenance efficiency of the filtration device and further improves the filtration efficiency of the device.

[0012] Moreover, the filtration unit rotates during filtration. Combining its flow direction of the medium liquid from the inside to the outside, the purpose of centrifugal filtration is achieved, which improves the flow efficiency of the medium liquid on the filter paper and further improves the filtration efficiency of the device.

[0013] Compared with the prior art, this technical solution can improve the filtration efficiency in two dimensions. One is to improve the filtration efficiency by improving the convenience of waste removal, that is, by improving the maintenance efficiency of the device. The other is to improve the filtration efficiency by centrifugal filtration to improve the flow efficiency of the medium liquid at the position of the filter paper, thereby enabling the efficient production of lithium hydroxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the filtration device for lithium hydroxide of the present invention;

[0015] Figure 2 for the present invention Figure 1 is a top view structural diagram after horizontally cutting the upper part of the outer shell in the present invention;

[0016] Figure 3 for the present invention Figure 2 is a sectional structural diagram of A-A in the present invention;

[0017] Figure 4 for the present invention Figure 3 is a partial enlarged structural diagram at X in the present invention.

[0018]

Description of the reference numerals

[0019] 1. Filtration unit;

[0020] 11: Cylinder body; 111. Barrel body; 112. Liquid inlet pipe; 113. Liquid outlet pipe;

[0021] 12: Filter element; 121, Filter paper; 122, Inner tube;

[0022] 13: Sealing cover;

[0023] 14: Second spring;

[0024] 15: Engagement sleeve; 151, First engagement ring; 152, Second engagement ring;

[0025] 2: Outer shell;

[0026] 3: Rotating drive member;

[0027] 4: Rotating connection assembly; 41, Bearing; 42, Bush; 43, End cover;

[0028] 5. Mechanical seal assembly; 51, Sliding ring; 52, First spring; 53, Sealing ring;

[0029] 6: Gear ring;

[0030] 7: Extension tube; Detailed implementation mode

[0031] For better explaining the present invention and facilitating understanding, the following combines the attached Figures 1 - 4 , and through specific implementation modes, the present invention is described in detail. Among them, the orientation nouns such as "upper" and "lower" mentioned in this article are based on Figure 1 the orientation for reference.

[0032] Embodiment 1:

[0033] Referring to Figures 1 - 4 , an embodiment of the present invention provides a filtering device for lithium hydroxide, including a filtering unit 1. The filtering unit 1 includes a cylinder body 11 and a filter element 12. The filter element 12 is detachably connected to the inside of the cylinder body 11 and the two are coaxial. The filter element 12 includes filter paper 121 and an inner tube 122. The filter paper 121 is arranged on the outer periphery of the inner tube 122, and the inner tube 122 is provided with liquid outlet holes; the cylinder body 11 is provided with a liquid inlet pipe 112 and a liquid outlet pipe 113. One end of the inner tube 122 is the liquid inlet end, and the liquid inlet end is communicated with the liquid inlet pipe 112. The liquid outlet pipe 113 is communicated with the space between the cylinder body 11 and the filter paper 121, so that the inner cavity surrounded by the filter element 12 forms a waste cavity; it also includes an outer shell 2 and a rotating drive member 3. The rotating drive member 3 is supported on the outer shell 2 and the drive end of the rotating drive member 3 is connected to the cylinder body 11. The cylinder body 11 is axially rotatably supported on the outer shell 2, so that the cylinder body 11 can rotate axially.

[0034] In this embodiment, lithium hydroxide adopts a cylindrical filtration structure, and the flow direction of the medium liquid is from the inside to the outside, that is, from the inner cylinder through the filter paper 121 and then into the space between the filter paper 121 and the cylinder body 11. Therefore, the filter residue will remain inside the filter paper 121, that is, in the waste cavity. When removing the waste, the filter paper 121 often needs to be replaced. At this time, the filter paper 121 can be replaced as a whole while cleaning out the waste at the same time, improving the maintenance efficiency of the filtration device and thus improving the filtration efficiency of the device.

[0035] Moreover, the filtration unit 1 rotates during filtration. Combining its flow direction of the medium liquid from the inside to the outside, the purpose of centrifugal filtration is achieved, improving the flow efficiency of the medium liquid on the filter paper 121 and further improving the filtration efficiency of the device.

[0036] Compared with the prior art, this technical solution can improve the filtration efficiency in two dimensions. One is to improve the filtration efficiency by improving the convenience of waste removal, that is, by improving the maintenance efficiency of the device. The other is to improve the filtration efficiency by increasing the flow efficiency of the medium liquid at the position of the filter paper 121 through centrifugal filtration, thereby enabling the efficient production of lithium hydroxide.

[0037] Specifically, the filter paper 121 should have a certain rigidity so that it can bear the centrifugal force.

[0038] Embodiment 2:

[0039] Referring to Figures 1 - 4 , in addition to having all the technical solutions of the above embodiment, the embodiment of the present invention further has the following technical solutions:

[0040] The filtration units 1 are arranged to be axially rotatably connected to the housing 2 in multiple numbers; the filtration units 1 are arranged in sequence and connected in series with each other, and the liquid outlet pipe 113 of the previous filtration unit 1 is connected to the liquid inlet pipe 112 of the next filtration unit 1.

[0041] In this embodiment, on the basis of Embodiment 1, the structural layout and working mode of the filtration unit 1 are further optimized, and higher filtration accuracy and efficiency are achieved through a multi-stage series design.

[0042] Specifically, the pore diameters of the filter elements 12 of different filtration units 1 can be arranged in a manner of decreasing from large to small to achieve step-by-step filtration.

[0043] The liquid outlet pipe 113 of the previous filtration unit 1 is connected to the liquid inlet pipe 112 of the next filtration unit 1, thus forming a continuous fluid delivery path, enabling the medium liquid to flow step by step between multiple filtration units 1 and gradually completing a more refined filtration process. Since the medium liquid flows through multiple filtration units 1 in sequence, each stage of filtration unit 1 can handle impurities of different particle sizes or properties. The previous-stage filtration unit 1 is mainly used to remove larger particulate matters, while the subsequent-stage filtration unit 1 focuses on capturing finer impurities, thereby achieving layer-by-layer refined filtration.

[0044] Each filtration unit 1 has a rotating function. Combining with the flow direction of the medium liquid from the inside to the outside, an independent centrifugal filtration effect is formed. As the medium liquid passes through multiple filtration units 1 stage by stage, the centrifugal effect accumulates continuously, further improving the flow efficiency and filtration accuracy of the medium liquid on the filter paper 121.

[0045] An independent waste chamber is provided inside each filtration unit 1 to collect the filter residues generated during the filtration process. During maintenance, the filter elements 12 of multiple filtration units 1 can be replaced simultaneously and the waste can be cleaned, simplifying the operation process.

[0046] By combining hierarchical filtration and centrifugal effect, this device can significantly improve production efficiency and equipment reliability while ensuring high filtration quality.

[0047] Embodiment 3:

[0048] Referring to Figures 1 - 4 , in addition to having all the technical solutions of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0049] The filtration units 1 are circumferentially distributed inside the housing 2; further including a rotating connection assembly 4 and a mechanical seal assembly 5, the liquid inlet pipe 112 and the liquid outlet pipe 113 are both rotatably connected to the housing 2 through the rotating connection assembly 4; further including an extension pipe 7 fixedly connected to the housing 2, the extension pipe 7 is connected to the corresponding liquid inlet pipe 112 and liquid outlet pipe 113 through the corresponding mechanical seal assembly 5, and the extension pipe 7 connected to the liquid outlet pipe 113 of the previous filtration unit 1 is connected to the extension pipe 7 connected to the liquid inlet pipe 112 of the next filtration unit 1.

[0050] In this embodiment, the filtration units 1 are circumferentially distributed inside the housing 2. This layout can not only make full use of the space inside the housing 2, but also ensure the independent operation between each filtration unit 1, thereby improving the overall filtration efficiency.

[0051] The rotating connection assembly 4 allows the liquid inlet pipe 112 and the liquid outlet pipe 113 to rotate together with the cylinder body 11 while maintaining a stable connection with the housing 2. The mechanical seal assembly 5 ensures the dynamic seal between the extension pipe 7 and the liquid inlet pipe 112 and the liquid outlet pipe 113.

[0052] An extension pipe 7 is fixedly connected to the outer shell 2, and these extension pipes 7 are connected to the corresponding liquid inlet pipe 112 and liquid outlet pipe 113 through a mechanical seal assembly 5. Specifically, the extension pipe 7 connected to the liquid outlet pipe 113 of the previous filtration unit 1 is further connected to the extension pipe 7 connected to the liquid inlet pipe 112 of the next filtration unit 1. In this way, a continuous fluid path is formed, enabling the medium liquid to flow smoothly between multiple filtration units 1.

[0053] The use of the rotating connection assembly 4 and the mechanical seal assembly 5 effectively solves the connection problem and sealing problem between the rotating parts and the fixed parts, enhancing the stability and reliability of the equipment operation. The design of the extension pipe 7 ensures the smooth transmission of fluid between different filtration units 1, improving the overall filtration efficiency.

[0054] Embodiment 4:

[0055] Referring to Figures 1 - 4 , in addition to having all the technical solutions of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0056] The rotating connection assembly 4 includes a bearing 41, a bushing 42 and an end cover 43. The bushing 42 is sleeved on the corresponding liquid inlet pipe 112 or liquid outlet pipe 113, the end cover 43 is detachably connected to the outer shell 2, the outer ring of the bearing 41 abuts against the end of the end cover 43 close to the cylinder body 11, and the inner ring of the bearing 41 abuts against the end of the bushing 42 away from the cylinder body 11; the extension pipe 7 is detachably and fixedly connected to the end cover 43.

[0057] In this embodiment, the bearing 41 is used to support the rotational movement of the liquid inlet pipe 112 or the liquid outlet pipe 113 and ensure its smooth operation. The outer ring of the bearing 41 abuts against one end of the end cover 43 close to the cylinder body 11, while the inner ring abuts against one end of the bushing 42 away from the cylinder body 11. The bushing 42 not only provides a mounting surface for the inner ring of the bearing 41 but also plays a role in protecting the pipeline. The end cover 43 is a detachable component fixed to the outer shell 2, specifically in the form of a threaded connection. It not only provides a stable support point for the bearing 41 but also facilitates the disassembly and assembly operations during maintenance. One end of the end cover 43 close to the cylinder body 11 is designed with a groove or step structure for tightly fitting with the outer ring of the bearing 41, thereby achieving effective force transmission and support.

[0058] By abutting the inner and outer rings of the bearing 41 against the bushing 42 and the end cover 43 respectively, good support for the liquid inlet pipe 112 or the liquid outlet pipe 113 during rotation is achieved, improving the stability and reliability of the system.

[0059] Combined with the application of the mechanical seal assembly 5, it ensures that a high level of sealing effect can be maintained even under dynamic conditions, effectively preventing liquid leakage and ensuring the safe operation of the equipment.

[0060] The extension pipe 7 is fixedly connected to the housing 2 through a flange. A threaded hole is provided in the middle of the flange, and the extension pipe 7 is threadedly connected in the threaded hole to improve the structural compactness during the connection of the extension pipe 7.

[0061] Example 5:

[0062] Referring to Figures 1 - 4 , in addition to having all the technical solutions of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0063] The mechanical seal assembly 5 includes a sliding ring 51, a first spring 52, and a sealing ring 53. One end of the extension pipe 7 facing the cylinder body 11 is provided with an annular groove. The sliding ring 51 is axially slidably connected in the annular groove and is slidably sealed with the annular groove. The first spring 52 is distributed in the annular groove, and both ends respectively abut against the sliding ring 51 and the side wall of the annular groove to maintain the elastic force away from the sliding ring 51 provided to the sliding ring 51; the sealing ring 53 is fixedly connected to the end surface of the liquid inlet pipe 112 or the liquid outlet pipe 113 facing the corresponding extension pipe 7; the opposite annular surfaces of the sliding ring 51 and the sealing ring 53 are respectively a first sealing surface and a second sealing surface, and the first sealing surface and the second sealing surface are kept in contact.

[0064] In this embodiment, the sliding ring 51 can axially slide in the annular groove while maintaining the sealing performance with the annular groove. The elastic force provided by the first spring 52 can automatically adjust the position of the sliding ring 51 to compensate for the incomplete fitting of the sealing surface caused by wear or other factors, ensuring that a good sealing effect is always maintained.

[0065] Through the close contact between the first sealing surface and the second sealing surface, efficient static and dynamic sealing is achieved, greatly improving the reliability and durability of the system.

[0066] Moreover, the extension pipe 7 extends towards the liquid inlet pipe 112 and the liquid outlet pipe 113 close to it to form an extension section. A narrow annular channel is formed between the extension section and the corresponding liquid inlet pipe 112 and liquid outlet pipe 113. The narrow annular channel can increase the difficulty of the medium liquid flowing towards the first sealing surface and the second sealing surface, thereby further reducing the probability of leakage.

[0067] Example 6:

[0068] Referring to Figures 1 - 4 , in addition to having all the technical solutions of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0069] The first sealing surface and the second sealing surface are mutually matching labyrinth surfaces to further improve the dynamic sealing effect.

[0070] Example 7:

[0071] Reference Figures 1 - 4 In addition to having all the technical solutions of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0072] The filtering units 1 are circumferentially distributed inside the housing 2; further included is a toothed ring 6 fixedly connected to the cylinder body 11 in one-to-one correspondence and coaxial with the cylinder body 11, and the driving end of the rotation driving member 3 is a gear, and the gear is in mesh with each toothed ring 6.

[0073] In this embodiment, the filtering units 1 are circumferentially distributed inside the housing 2. This layout not only makes full use of the space of the housing 2, but also ensures the independent operation between the respective filtering units 1, thereby improving the overall filtering efficiency. A toothed ring 6 is fixedly connected to each cylinder body 11 in one-to-one correspondence, and these toothed rings 6 are coaxially arranged with their respective cylinder bodies 11. Such a design can ensure that each filtering unit 1 receives the same rotational power input and realizes a balanced rotational movement.

[0074] The driving end of the rotation driving member 3 is designed in the form of a gear, and this gear is in mesh with each toothed ring 6. This design enables the rotation driving member 3 to simultaneously drive all the filtering units 1 to rotate synchronously, simplifies the complexity of the driving system, and at the same time improves the stability and reliability of the system.

[0075] Since each filtering unit 1 is equipped with an independent toothed ring 6, and these toothed rings 6 are all in mesh with the driving gear, it can be ensured that each filtering unit 1 obtains a consistent power input, realizes a uniform rotational distribution, and is beneficial to improving the filtering effect.

[0076] Using a single driving source can drive multiple filtering units 1 to rotate, reduces the number of driving components, lowers the equipment cost and maintenance difficulty, and at the same time improves the integration degree of the system.

[0077] The synchronously rotating filtering units 1 enhance the centrifugal filtering effect, contribute to accelerating the flow rate of the medium liquid on the filter paper 121, improve the filtering efficiency and reduce the impurity residue.

[0078] Embodiment 8:

[0079] Reference Figures 1 - 4 In addition to having all the technical solutions of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0080] The filtering unit 1 further includes a cover 13, a second spring 14, and a joint sleeve 15; the cover 13 is connected to one end of the inner tube 122 facing the liquid outlet pipe 113 to seal the end of the inner tube 122; both ends of the second spring 14 abut against the cover 13 and the cylinder 11 to apply an elastic force to the inner tube 122 away from the liquid outlet pipe 113; first and second joint rings 151 and 152 are formed at both axial ends of the joint sleeve 15, the first joint ring 151 is docked with the other end of the inner tube 122 and kept sealed, and the second joint ring 152 is docked with the outlet end of the liquid inlet pipe 112 and kept sealed.

[0081] In this embodiment, the cover 13 is connected to one end of the inner tube 122 facing the liquid outlet pipe 113 for sealing the end of the inner tube 122. This can prevent the medium liquid from directly entering the space between the cylinder 11 and the filter paper 121 without passing through the filter paper 121, ensuring that all medium liquid passes through the filter paper 121 for effective filtration. The second spring 14 is located between the cover 13 and the cylinder 11, and both ends thereof abut against the cover 13 and the cylinder 11 respectively to ensure that the other end of the inner tube 122 can be stably and reliably communicated with the liquid inlet pipe 112 by the joint sleeve 15. The two joint rings ensure that the medium liquid input by the liquid inlet pipe 112 can smoothly flow into the inner tube 122 without leakage.

[0082] The designs of the cover 13 and the joint sleeve 15 ensure good sealing between the inner tube 122 and other components, preventing the medium liquid from directly flowing out without passing through the filter paper 121 and improving the filtering effect. The elastic force provided by the second spring 14 helps to maintain the stable position of the inner tube 122, especially the position offset that may be caused by rotation or other mechanical actions during the operation of the equipment, thereby enhancing the dynamic stability of the system.

[0083] The detachable designs of the cover 13 and the joint sleeve 15 facilitate quick disassembly and assembly, making it convenient for daily inspections, cleaning, and operations such as replacing the filter element 12, reducing the downtime and improving the work efficiency.

[0084] Embodiment 9:

[0085] Figures 1 - 4 , an embodiment of the present invention provides a lithium hydroxide filtering system, including the lithium hydroxide filtering device in any of the above embodiments, further including a sedimentation device and a primary filtering device. The primary filtering device receives the filtrate from the sedimentation device, and the lithium hydroxide filtering device receives the filtrate from the primary filtering device; the primary filtering device is set as a plate filter or a vacuum belt filter.

[0086] In this embodiment, the sedimentation device is mainly used to preliminarily remove larger particle impurities and precipitates in the lithium hydroxide solution. Through the action of gravity, the heavier impurities naturally settle to the bottom of the container, thereby achieving preliminary purification.

[0087] The primary filtration device receives the filtrate from the sedimentation device and conducts the first fine filtration on it. According to specific requirements, the primary filtration device can be set as a plate filter or a vacuum belt filter. The filtration device in any of the above embodiments receives the filtrate from the primary filtration device and conducts the final efficient filtration. Therefore, this filtration system includes all the beneficial effects in any of the above embodiments. To avoid repetition, no detailed description will be given here.

[0088] It can be understood that in the above Embodiments 1-9, except for the conflicting parts, they can be freely combined to form other embodiments of the present invention.

[0089] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0090] In the present invention, unless otherwise clearly specified and defined, the terms such as "installed", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0091] In the present invention, unless otherwise clearly specified and defined, when the first feature is "on" or "under" the second feature, it can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, when the first feature is "above", "over" and "on" the second feature, it can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal height than the second feature. When the first feature is "under", "below" and "beneath" the second feature, it can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal height than the second feature.

[0092] The term "comprises" or any other similar term is intended to cover non-exclusive inclusion, so that a process, article or device / equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes the elements inherent in these processes, articles or devices / equipment.

[0093] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A filtering device for lithium hydroxide, characterized in that: It comprises a filter unit (1), a housing (2) and a rotating drive member (3); The filter unit (1) comprises a barrel (11) and a filter element (12); the barrel (11) and the filter element (12) are detachably connected to the barrel (11) and are coaxial; the filter element (12) comprises filter paper (121) and an inner tube (122); the filter paper (121) is arranged on the outer periphery of the inner tube (122); and a liquid outlet hole is provided on the inner tube (122); The barrel (11) comprises a barrel body (111) and a liquid inlet pipe (112) and a liquid outlet pipe (113) connected to two axial ends of the barrel body (111); one end of the inner tube (122) is a liquid inlet end and the liquid inlet end is connected to the liquid inlet pipe (112); the liquid outlet pipe (113) is connected to the space between the barrel body (11) and the filter paper (121), so that the inner cavity surrounded by the filter element (12) forms a waste cavity; The rotary drive member (3) is supported on the outer shell (2) and its drive end is connected to the cylinder (11). The cylinder (11) is axially rotatably supported on the outer shell (2) so that the cylinder (11) can rotate axially.

2. The filter device for lithium hydroxide according to claim 1, wherein: The filter units (1) are arranged to be axially rotatably connected to the housing (2) in plurality; The filter units (1) are arranged in sequence and connected in series with each other, and the liquid outlet pipe (113) of the previous filter unit (1) is connected to the liquid inlet pipe (112) of the next filter unit (1).

3. The filter device for lithium hydroxide as claimed in claim 2, characterized in that: The filter unit (1) is circumferentially distributed inside the housing (2); It also includes a rotating connection assembly (4) and a mechanical sealing assembly (5), wherein the liquid inlet pipe (112) and the liquid outlet pipe (113) are both rotatably connected to the housing (2) via the rotating connection assembly (4); It also comprises an extension tube (7) fixedly connected to the housing (2), the extension tube (7) being connected to the corresponding liquid inlet tube (112) and the liquid outlet tube (113) via the corresponding mechanical seal assembly (5), the extension tube (7) being connected to the liquid outlet tube (113) of the preceding filter unit (1) being connected to the extension tube (7) being connected to the liquid inlet tube (112) of the succeeding filter unit (1).

4. The filtering device for lithium hydroxide as claimed in claim 3, characterized in that: The rotating connection assembly (4) comprises a bearing (41), a shaft sleeve (42) and an end cover (43); the shaft sleeve (42) is sleeved on the corresponding liquid inlet pipe (112) or the liquid outlet pipe (113); the end cover (43) is detachably connected to the housing (2); the outer ring of the bearing (41) abuts against the end of the end cover (43) close to the cylinder (11); and the inner ring of the bearing (41) abuts against the end of the shaft sleeve (42) away from the cylinder (11); The extension tube (7) is detachably fixedly connected to the end cover (43).

5. The filtering device for lithium hydroxide as claimed in claim 3, characterized in that: The mechanical seal assembly (5) comprises a sliding ring (51), a first spring (52) and a sealing ring (53); an annular groove is provided at one end of the extension tube (7) facing the cylinder (11); the sliding ring (51) is axially slidably connected in the annular groove and is slidably sealed with the annular groove; the first spring (52) is distributed in the annular groove, and the two ends of the first spring (52) respectively abut against the sliding ring (51) and the side wall of the annular groove to keep providing elastic force to the sliding ring (51) away from the sliding ring (51); The sealing ring (53) is fixedly connected to the end surface of the liquid inlet pipe (112) or the liquid outlet pipe (113) facing the corresponding extension pipe (7); The opposing annular surfaces of the sliding ring (51) and the sealing ring (53) are respectively a first sealing surface and a second sealing surface, and the first sealing surface and the second sealing surface are kept in abutment with each other.

6. The filtering device for lithium hydroxide according to claim 5, characterized in that: The first sealing surface and the second sealing surface are labyrinth surfaces that match each other.

7. The filtering device for lithium hydroxide according to claim 2, characterized in that: The filter unit (1) is circumferentially distributed inside the housing (2); It also includes gear rings (6) which are fixedly connected to the cylinder (11) in a one-to-one correspondence and are coaxial with the cylinder (11). The driving end of the rotating driving member (3) is a gear, and the gear is meshed with each of the gear rings (6).

8. The filtering device for lithium hydroxide according to claim 1, characterized in that: The filter unit (1) further comprises a sealing cover (13), a second spring (14) and a coupling sleeve (15); The sealing cover (13) is connected to one end of the inner tube (122) facing the liquid outlet tube (113) to close the end of the inner tube (122); Two ends of the second spring (14) abut against the sealing cover (13) and the cylinder (11) to apply an elastic force to the inner tube (122) away from the liquid outlet tube (113); A first engaging ring (151) and a second engaging ring (152) are formed at two axial ends of the engaging sleeve (15); the first engaging ring (151) is butted against the other end of the inner tube (122) and remains sealed, and the second engaging ring (152) is butted against the outlet end of the liquid inlet tube (112) and remains sealed.

9. A lithium hydroxide filtration system, characterized in that: A lithium hydroxide filtering device comprising the lithium hydroxide filtering device according to any one of claims 1 to 8, further comprising a sedimentation device and a primary filtering device, wherein the primary filtering device receives the filtrate from the sedimentation device, and the lithium hydroxide filtering device receives the filtrate from the primary filtering device; The primary filtration device is configured as a pressure plate filter or a vacuum belt filter.

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