A liquid level gauge casing, liquid level gauge assembly and filter concentrator

Abstract

The application discloses a liquid level meter sleeve, a liquid level meter assembly and a filter concentrator. The liquid level meter sleeve comprises a sleeve body for sleeving outside a liquid level meter probe rod and being spaced apart from the liquid level meter probe rod, and a strip-shaped hole extending in an axial direction is formed in a side wall of the sleeve body; and a liquid level meter radial positioning structure is installed in the sleeve body and is used for radially positioning the liquid level meter probe rod sleeved in the sleeve body, a part of the liquid level meter radial positioning structure used for contacting the liquid level meter probe rod is made of a material not affecting liquid level meter detection, and the liquid level meter radial positioning structure forms an axial flow guide channel in the sleeve body. The liquid level meter radial positioning structure prevents the liquid level meter probe rod from contacting or colliding with the liquid level meter sleeve body.

Description

Technical Field

[0001] Embodiments of this application relate to crystallization equipment, filtration concentrators, and suitable filter element mounting structures and level gauge assemblies and their sleeves. The crystallization equipment is suitable for crystallization reactions of secondary battery cathode material precursors, particularly for co-precipitation reactions of ternary precursors. The filtration concentrator is suitable for filtering the feed solution after the crystallization reaction of secondary battery cathode material precursors, such as the co-precipitation reaction of ternary precursors, thereby concentrating the crystalline particles. Background Technology

[0002] Currently, the preparation process of ternary precursors for lithium-ion secondary battery cathode materials involves preparing a mixed salt solution of nickel sulfate (or nickel chloride), cobalt sulfate (or cobalt chloride), and manganese sulfate (or manganese chloride) with a specific molar concentration, preparing an alkaline solution of sodium hydroxide with a specific molar concentration, and using ammonia water of a specific concentration as a complexing agent. The mixed salt solution, alkaline solution, and complexing agent are then added to a reaction vessel at a controlled flow rate. The stirring rate of the reaction vessel, the temperature and pH of the reaction slurry, and the reaction atmosphere (currently, the reaction process is generally required to be completed under nitrogen protection) are controlled to allow the salt and alkali to undergo a neutralization reaction, generating ternary precursor crystal nuclei that gradually grow. Once the particle size reaches a predetermined value, the reaction product is filtered, washed, and dried to obtain the ternary precursor. It is evident that many process parameters need to be controlled during the reaction, mainly including: the concentrations of salt and alkali, the concentration of ammonia water, the rate at which the salt and alkali solutions are added to the reaction vessel, the reaction temperature, the pH value of the reaction process, the stirring rate, the reaction time, the solid content of the reaction slurry, and the reaction atmosphere, etc. After the ternary precursor is prepared, it is mixed with the lithium source in a certain proportion and then calcined. The cooled material is then crushed, pulverized, graded and dried to obtain the positive electrode material for lithium-ion secondary batteries.

[0003] The aforementioned reactor actually includes a main reactor and a secondary reactor; a filtration and concentration machine is also deployed next to the secondary reactor for "external concentration". In the preparation of the ternary precursor for the positive electrode material of lithium-ion secondary batteries, raw materials such as a mixed salt solution of nickel sulfate (or nickel chloride), cobalt sulfate (or cobalt chloride), and manganese sulfate (or manganese chloride) with a certain molar concentration, and an alkaline solution of sodium hydroxide with a certain molar concentration, are all added to the main reactor. Once the liquid in the main reactor exceeds a set height, it overflows into the secondary reactor. As the raw materials for the crystallization reaction (salt solution, alkaline solution, ammonia) are continuously added to the main reactor, the liquid in the main reactor continuously overflows into the secondary reactor, and the liquid in the secondary reactor then enters the filtration and concentration machine.

[0004] The filter thickener contains a filter element and a stirring device. After filtering the feed liquid through the filter element, a clear liquid is output from the filter thickener. This clear liquid can be reused as mother liquor in the reaction, while the concentrated liquid in the filter thickener is returned to the main reactor or secondary reactor through a concentrated slurry reflux structure. The stirring device in the filter thickener generally includes a drive assembly, a shaft assembly, and a paddle assembly. The drive assembly is mounted on the upper end face of the filter thickener cylinder. The upper end of the shaft assembly is connected to the drive assembly, and the lower end extends into the cylinder. The paddle assembly is mounted on the shaft assembly. When the paddle assembly rotates, it can stir the slurry, preventing the sedimentation of crystalline particles in the feed liquid and prolonging the filter cake formation time on the filter element. However, the crystallization process that combines the main reactor, secondary reactor, and filter thickener not only involves a large number of devices, resulting in high procurement and operating costs, but also requires the feed liquid to remain and react separately outside the main reactor, secondary reactor, and filter thickener, affecting the consistency of the ternary precursor. Summary of the Invention

[0005] The embodiments of this application provide a crystallization apparatus that can solve the technical problems of current crystallization processes, such as the large number of devices and the impact of the reaction of the feed liquid in different devices on the consistency of crystallized particles. Furthermore, other embodiments of this application provide improved filter element mounting structures, level gauge sleeves, level gauge assemblies, and filtration concentrators, which can be used in the aforementioned crystallization apparatus or similar equipment (such as filtration concentrators).

[0006] A crystallization apparatus, in the first aspect, continuously receives raw materials for a crystallization reaction during operation, either intermittently or continuously. The liquid material in the crystallization apparatus, without being diverted to other crystallization containers, is continuously discharged from the crystallization apparatus after liquid-solid separation from the crystallized particles formed by the crystallization reaction through a built-in filter element. It includes a reaction vessel, a stirring device, and a filtering device. The reaction vessel comprises a reaction vessel body and a feeding assembly, a discharging assembly, a temperature control assembly, an air inlet assembly, and an exhaust assembly disposed on the reaction vessel body. The feeding assembly is used to add raw materials for the crystallization reaction into the reaction vessel body, and the discharging assembly is used to discharge the crystallized particles from the reaction vessel body. The temperature control assembly is used to control the temperature of the liquid inside the reactor body; the air inlet assembly is used to add inert gas into the reactor body; and the exhaust assembly is used to exhaust the gas inside the reactor body. The stirring device includes a drive assembly, a transmission assembly, and a liquid agitation assembly. The drive assembly provides initial power to the stirring device, and the transmission assembly transmits the initial power to the liquid agitation assembly. The liquid agitation assembly contacts the liquid inside the reactor body and agitates the liquid under the drive of the transmission assembly. The filtration device includes at least one set of filter elements installed inside the reactor body. The at least one set of filter elements is connected to a clear liquid output pipeline, which extends to the outside of the reactor.

[0007] A second aspect of a filter element mounting structure includes a filter element mounting tube that extends in a circumferentially curved manner. The filter element mounting tube is provided with a clear liquid output section and a plurality of filter element mounting portions spaced apart along the length of the filter element mounting tube. The plurality of filter element mounting portions are respectively used to mount filter elements and to guide the clear liquid output from the filter elements into the filter element mounting tube and then discharge it through the clear liquid output section. The filter element mounting tube includes a curved section and straight pipe sections located at both ends of the curved section. At least one of the plurality of filter element mounting portions and the clear liquid output section is located on the straight pipe section.

[0008] A third aspect of a filter element installation structure includes a filter element installation tube, which has a clear liquid output section and a plurality of filter element installation sections spaced apart along the length of the filter element installation tube. The plurality of filter element installation sections are used to install filter elements and to guide the clear liquid output by the filter elements into the filter element installation tube and discharge it through the clear liquid output section. The plurality of filter element installation sections each include a flange integral with the filter element installation tube and a filter element connector welded to the flange. The weld between the flange and the filter element connector is located on the mating end face between the flange and the filter element connector.

[0009] A fourth aspect of a filter element mounting structure includes a filter element mounting tube, which has a clear liquid output section and a plurality of filter element mounting sections spaced apart along the length of the filter element mounting tube. The plurality of filter element mounting sections are used to install filter elements and to guide the clear liquid output by the filter elements into the filter element mounting tube and then discharge it through the clear liquid output section. When the filter element mounting structure is assembled in a filtration device, the clear liquid output section discharges the clear liquid from the filtration device through an independent clear liquid output tube that is connected to the clear liquid output section one by one.

[0010] A fifth aspect of a filter element installation structure includes a filter element installation tube, which has a clear liquid output section and a plurality of filter element installation parts spaced apart along the length of the filter element installation tube. The plurality of filter element installation parts are used to install filter elements and guide the clear liquid output from the filter elements into the filter element installation tube before discharging it through the clear liquid output section. Each of the plurality of filter element installation parts includes a filter element connector disposed on the filter element installation tube. The filter element connector is connected to the filter element installation connector via a connecting mechanism. Furthermore, the filter element connector has a first mating part and a second mating part on the filter element connector side; the connecting mechanism has a first mating part and a second mating part on the connecting mechanism side; and the installation connector has a first mating part and a second mating part on the installation connector side. After the filter element connector is connected to the filter element installation connector via the connecting mechanism, the first mating part on the filter element connector side mates with the first mating part on the installation connector side, and the second mating parts on the filter element connector side and the second mating parts on the installation connector side respectively mate with the first mating part on the connecting mechanism side and the second mating part on the connecting mechanism side.

[0011] A sixth aspect of a level gauge sleeve includes: a sleeve body for fitting around a level gauge probe at a certain distance from the probe, wherein an axially extending strip-shaped hole is provided on the side wall of the sleeve body; and a level gauge radial positioning structure installed in the sleeve body for radially positioning the level gauge probe fitted in the sleeve body, wherein the portion of the level gauge radial positioning structure that contacts the level gauge probe is made of a material that does not affect the level gauge detection, and the level gauge radial positioning structure forms an axial flow channel in the sleeve body.

[0012] A level gauge assembly according to a seventh aspect includes a level gauge and a level gauge sleeve according to the sixth aspect, wherein the level gauge and the level gauge sleeve are assembled together.

[0013] An eighth aspect of a filtration concentrator includes: a cylindrical body; a stirring device comprising a drive assembly, a rotating shaft assembly, and a paddle assembly, the drive assembly being mounted on the upper end face of the cylindrical body, the upper end of the rotating shaft assembly being connected to the drive assembly and the lower end extending into the cylindrical body, and the paddle assembly being mounted on the rotating shaft assembly; a filtration device comprising at least one set of filter elements, the at least one set of filter elements being mounted inside the cylindrical body and located beside the rotating shaft assembly and / or the paddle assembly, the at least one set of filter elements being connected to a clear liquid output pipeline, the clear liquid output pipeline extending to the outside of the cylindrical body; a manhole being provided on the upper end face of the cylindrical body, the drive assembly being mounted on the manhole via a flange connection structure, the manhole being openable when the flange connection structure is disassembled.

[0014] The present application will be further described below with reference to the accompanying drawings and specific embodiments. Additional aspects and advantages of the present application will be set forth in part in the description which follows, and in part will be obvious from the description or may be learned by practice. Attached Figure Description

[0015] The accompanying drawings, which form part of this specification, are used to aid in understanding this application. The content provided in the drawings and the related descriptions in this specification can be used to explain the embodiments of this application, but do not constitute an undue limitation on this application.

[0016] Figure 1 This is a schematic diagram of a crystallization apparatus according to an embodiment of this application.

[0017] Figure 2 This is a schematic diagram of a crystallization apparatus according to an embodiment of this application.

[0018] Figure 3 This is a schematic diagram of a second embodiment of a crystallization apparatus according to this application.

[0019] Figure 4 This is a schematic diagram of a crystallization apparatus according to an embodiment of this application, representing a third-mode structure.

[0020] Figure 5 This is a schematic diagram of a filter element installation structure according to an embodiment of this application.

[0021] Figure 6 for Figure 5 A partial schematic diagram of the filter element installation structure shown.

[0022] Figure 7 This is a schematic diagram of a manhole structure according to an embodiment of this application.

[0023] Figure 8 This is a schematic diagram of the structure of a level gauge sleeve according to an embodiment of this application.

[0024] Figure 9This is a schematic diagram of the radial positioning structure of a level gauge in a level gauge sleeve according to an embodiment of this application.

[0025] Figure 10 This is a schematic diagram illustrating the interaction between the radial positioning structure of the level gauge and the body of the level gauge sleeve in an embodiment of this application.

[0026] Figure 11 A photograph of the actual filter element connector welded onto the existing filter element installation tube.

[0027] Figure 12 This is a schematic diagram of a filter element mounting tube in a filter element mounting structure according to an embodiment of this application.

[0028] Figure 13 This is a schematic diagram of a filter element installation structure according to an embodiment of this application.

[0029] Figure 14 This is a photograph of an engineering drawing of the welding process between the perforation and the filter element joint in a filter element installation structure according to an embodiment of this application (the angle of the welding bevel is marked as 60°). Detailed Implementation

[0030] The present application will now be clearly and completely described in conjunction with the accompanying drawings. Those skilled in the art will be able to implement the present application based on these descriptions. Before describing the present application in conjunction with the accompanying drawings, it should be particularly noted that:

[0031] The technical solutions and features provided in the various sections, including the following description, can be combined with each other without conflict. Furthermore, where possible, these technical solutions, features, and related combinations can be given specific technical subject matter and protected by relevant patents.

[0032] The embodiments of this application described below are generally only some embodiments and not all embodiments. All other embodiments obtained by those skilled in the art based on these embodiments without creative effort should fall within the scope of patent protection.

[0033] Regarding the terminology and units in this specification: The terms "comprising," "including," "having," and any variations thereof in this specification, the corresponding claims, and related sections are intended to cover non-exclusive inclusion. Other related terms and units can be reasonably interpreted based on the relevant content of this specification.

[0034] Currently, the crystallization process of ternary precursors for lithium-ion secondary battery cathode materials mainly includes a main reactor and a secondary reactor. A filtration and concentration machine is also deployed next to the secondary reactor for "external concentration." During the crystallization process of the ternary precursors for lithium-ion secondary battery cathode materials, raw materials such as a mixed salt solution of nickel sulfate (or nickel chloride), cobalt sulfate (or cobalt chloride), and manganese sulfate (or manganese chloride) with a certain molar concentration, and an alkaline solution of sodium hydroxide with a certain molar concentration, are added to the main reactor. Once the liquid in the main reactor exceeds a set height, it overflows into the secondary reactor. As the raw materials for the crystallization reaction (salt solution, alkaline solution, ammonia) are continuously added to the main reactor, the liquid in the main reactor continuously overflows into the secondary reactor, and the liquid in the secondary reactor then enters the filtration and concentration machine.

[0035] The filter thickener contains a filter element and a stirring device. After filtering the feed liquid through the filter element, a clear liquid is output from the filter thickener. This clear liquid can be reused as mother liquor in the reaction, while the concentrated liquid in the filter thickener is returned to the main reactor or secondary reactor through a concentrated slurry reflux structure. The stirring device in the filter thickener generally includes a drive assembly, a shaft assembly, and a paddle assembly. The drive assembly is mounted on the upper end face of the filter thickener cylinder. The upper end of the shaft assembly is connected to the drive assembly, and the lower end extends into the cylinder. The paddle assembly is mounted on the shaft assembly. When the paddle assembly rotates, it can stir the slurry, preventing the sedimentation of crystalline particles in the feed liquid and prolonging the filter cake formation time on the filter element. However, the crystallization process that combines the main reactor, secondary reactor, and filter thickener not only involves a large number of devices, resulting in high procurement and operating costs, but also requires the feed liquid to remain and react separately outside the main reactor, secondary reactor, and filter thickener, affecting the consistency of the ternary precursor.

[0036] To address the aforementioned issues, the applicant has developed a new crystallization device that integrates the main reactor, secondary reactor, and filtration concentrator into a single unit. The advantages of this crystallization device are primarily: First, it reduces the number of devices, saving on investment and floor space. Second, it saves energy. Previously, when the main reactor, secondary reactor, and filtration concentrator were separate units, each required a stirring device, resulting in high power consumption; integrating these three units into a single crystallization device significantly reduces the energy consumption of the stirring devices. Third, it effectively reduces the volume of the feed liquid outside the reactor, making the crystallization reaction (co-precipitation reaction) more controllable. Fourth, the increased integration reduces the time and resources spent on maintenance, repair, and cleaning of each unit. Fifth, it reduces process control points and automatic interlocking relationships. In developing this crystallization device, the applicant designed several prototypes and addressed some technical issues existing in the current filtration concentrator during the design process. This specification will further describe the applicant's newly developed crystallization device and related technical details. It should be noted that the improvements made in the following sections to address some of the technical problems existing in existing filter concentrators are also applicable to other filter concentrators, such as those used when implementing "external concentration".

[0037] Figure 1 This is a schematic diagram of a crystallization apparatus according to an embodiment of this application. Figure 1As shown in the embodiment of this application, a crystallization device continuously receives raw materials for the crystallization reaction during operation, either intermittently or continuously. The liquid material in the crystallization device, without being diverted to other crystallization containers, continuously passes through a built-in filter element to separate the liquid from the crystallized particles formed by the crystallization reaction before being discharged from the crystallization device. It includes a reaction vessel 1, a stirring device 2, and a filtering device 3. The reaction vessel 1 includes a reaction vessel body 11 and a feeding assembly 12, a discharging assembly 13, a temperature control assembly 14, an air intake assembly 15, and an exhaust assembly 16 disposed on the reaction vessel body 11. The feeding assembly 12 is used to add raw materials for the crystallization reaction into the reaction vessel body 11, the discharging assembly 13 is used to discharge the crystallized particles from the reaction vessel body 11, and the temperature control assembly 14... The gas inlet assembly 15 is used to add inert gas into the reactor body 11, and the gas outlet assembly 16 is used to discharge the gas from the reactor body 11. The stirring device 2 includes a drive assembly 21, a transmission assembly 22, and a liquid agitation assembly 23. The drive assembly 21 provides initial power to the stirring device 2, and the transmission assembly 22 transmits the initial power to the liquid agitation assembly 23. The liquid agitation assembly 23 contacts the liquid in the reactor body 11 and agitates the liquid under the drive of the transmission assembly 22. The filtration device 3 includes at least one set of filter elements 31 installed inside the reactor body 11. The at least one set of filter elements 31 is connected to a clear liquid output pipe 32, which extends to the outside of the reactor body 1.

[0038] Specifically, the feed assembly 12 includes a first feed pipe 121 for conveying a mixed salt solution, wherein the mixed salt solution refers to a mixed salt solution of a certain molar concentration prepared from nickel sulfate (or nickel chloride), cobalt sulfate (or cobalt chloride), and manganese sulfate (or manganese chloride). The feed assembly 12 also includes a second feed pipe 122 for conveying an alkaline solution, wherein the alkaline solution refers to an alkaline solution of a certain molar concentration prepared from sodium hydroxide. The feed assembly 12 also includes a third feed pipe 123 for conveying ammonia water, which serves as a complexing agent in the co-precipitation reaction of the ternary precursor for lithium-ion secondary battery cathode materials. The first feed pipe 121, the second feed pipe 122, and the aforementioned feed pipes are independent pipes that extend into the reactor body 11. The outlet is preferably located in a position within the reactor body 11 where the stirring rate of the liquid is relatively high, thereby enabling faster mixing and reaction.

[0039] The unloading assembly 13 is typically a unloading channel (including an unloading port at the bottom of the reactor body 11 and an unloading valve on the unloading channel) located at the bottom of the reactor body 11. During the crystallization process of the ternary precursor for lithium-ion secondary battery cathode materials, nickel sulfate (or nickel chloride), cobalt sulfate (or cobalt chloride), and manganese sulfate (or manganese chloride) are prepared into a mixed salt solution of a certain molar concentration, sodium hydroxide is prepared into an alkaline solution of a certain molar concentration, and ammonia water of a certain concentration is used as a complexing agent. The mixed salt solution, alkaline solution, and complexing agent are then added to the reactor body 11 at a certain flow rate. The stirring rate of the stirring device 2, the temperature and pH of the reaction slurry, and the reaction atmosphere (currently, the reaction process is generally required to be completed under nitrogen protection) are controlled to allow the salt and alkali to undergo a neutralization reaction, generating ternary precursor crystal nuclei that gradually grow. When the particle size reaches a predetermined value, the addition of raw materials for the crystallization reaction to the reactor body 11 is stopped. Afterward, the crystalline particles in the reactor body 11 can be discharged through the unloading assembly 13.

[0040] The temperature control assembly 14 typically includes an insulation jacket 141 disposed outside the reactor body 11, a piping system for inputting and outputting a heating medium (usually hot water) into the insulation jacket 141, and valve groups, controllers, and temperature sensors for controlling parameters such as the flow rate of the piping system. Controlling the temperature in the reactor 1 via the temperature control assembly 14 is existing technology.

[0041] The air intake assembly 15 is preferably used to add inert gas to the liquid near the bottom of the reactor body 11. In this case, the air intake pipe 151 of the air intake assembly 15 should be inserted into the bottom of the reactor body 11.

[0042] Typically, the drive assembly 21 (including a drive motor and a transmission) is mounted on the upper surface of the reactor 1. The transmission assembly 22 is specifically a rotating shaft assembly, the upper end of which is connected to the drive assembly 21 and the lower end of which extends into the reactor 1. The liquid agitation assembly 23 is specifically a paddle assembly, which is mounted on the rotating shaft assembly. Furthermore, the filter device 3 is arranged beside the rotating shaft assembly and / or the paddle assembly.

[0043] The output end of the clear liquid output pipeline 32 is connected to the purging system 33. The purging system 33 includes a backflush device 331, which is used to push backflush liquid (usually the clear liquid filtered by the filter element 31) back into the filter element 31 from the clear liquid output pipeline 32 in reverse and quickly, thereby backwashing the filter element 31 with the backflush liquid to restore the filtration flux of the filter element 31.

[0044] During the operation of the aforementioned crystallization equipment, raw materials for the crystallization reaction can be received intermittently or continuously. Therefore, the filtration device 3 also needs to continuously filter the liquid in the reactor body 11, either intermittently or continuously. To better control the addition rate of the raw materials for the crystallization reaction and the filtration rate of the filtration device 3, the liquid level in the reactor body 11 can be detected. Therefore, the crystallization equipment should typically also be equipped with a level gauge 4. The level gauge 4 can be vertically inserted into the reactor body 11 from the top.

[0045] When developing the crystallization equipment, the applicant designed prototypes in various ways to address the specific technical details of the crystallization equipment (such as the specific structure of the filtration device). These different approaches will be described below.

[0046] It should be noted that, where possible, these methods and their improvements can also be applied to filtration concentrators. A filtration concentrator typically includes a cylinder, a stirring device, and a filtration device; the stirring device comprises a drive assembly, a shaft assembly, and a paddle assembly. The drive assembly is mounted on the upper end face of the cylinder. The upper end of the shaft assembly is connected to the drive assembly, and its lower end extends into the cylinder. The paddle assembly is mounted on the shaft assembly. The filtration device includes at least one set of filter elements, which are installed inside the cylinder and located beside the shaft assembly and / or the paddle assembly. The at least one set of filter elements is connected to a clarified liquid output line, which extends to the outside of the cylinder.

[0047] Method 1

[0048] Figure 2 This is a schematic diagram of a crystallization apparatus according to an embodiment of this application. Figure 2As shown, in the crystallization equipment of Method 1, a filter device mounting port 111 is provided on the top of the shell of the reactor body 11. The filter element assembly 34 is installed on the filter device mounting port 111 and suspended in the inner cavity of the reactor body 11 via a flange connection structure. The filter element assembly 34 includes an upper flange 341, an anti-vibration tie rod assembly 342, a filter element mounting base 343, a clear liquid output pipe 344, and a set of filter elements 31. The upper flange 341 is used to connect with the flange on the filter device mounting port to form the flange connection structure. The filter element mounting base 343 is connected to the filter element mounting port. The anti-vibration tie rod assembly 342 is suspended and fixed below the upper flange 341. The mounting joints at the upper ends of each filter element 31 in the group of filter elements 31 are respectively installed on the filter element mounting base 343 and communicate with the inner cavity of the filter element mounting base 343. The lower ends of each filter element 31 in the group of filter elements 31 are connected by a limiting structure. The clear liquid output pipe 344 is used for the clear liquid output pipeline 32 and is connected between the filter element mounting base 343 and the upper flange 341. The upper flange 341 is provided with a clear liquid output interface that communicates with the clear liquid output pipe 344.

[0049] Specifically, the vibration damping tie rod assembly 342 includes at least two solid tie rods, the two ends of which are fixedly connected to the upper flange 341 and the filter element mounting base 343, respectively.

[0050] In developing the crystallization equipment of Method 1, the inventors discovered that: because the drive assembly 21 (including a drive motor and a transmission) is mounted on the upper surface of the reactor 1, the upper end of the rotating shaft assembly is connected to the drive assembly 21 and the lower end extends into the reactor 1, and the paddle assembly is mounted on the rotating shaft assembly, during the operation of the crystallization equipment, the paddle assembly continuously rotates, causing the liquid in the reactor body 11 to be in a state of agitation. Since the filter element assembly 34 is suspended in the inner cavity of the reactor body 11, the movement of the liquid easily causes the filter element assembly 34 to vibrate, thus affecting the service life of the filter element 31, especially easily causing the filter element 31 to break and the fragments to contaminate the liquid. Currently, the market price of ternary cathode materials for lithium-ion secondary batteries is high, and if the filter element 31 breaks and the fragments contaminate the liquid, it will lead to significant economic losses. Therefore, an anti-vibration tie rod assembly 342 was adopted. The anti-vibration tie rod assembly 342 can effectively prevent the vibration of the filter element assembly 34 and improve the service life of the filter element 31.

[0051] In addition, the number of filter device mounting ports 111 is 2-6 and they are arranged at intervals along the circumference of the reactor body 11, and each filter device mounting port 111 is equipped with a filter element assembly 34.

[0052] In the crystallization equipment of Method 1, the first feed pipe 121, the second feed pipe 122, and the third feed pipe 123 are all inserted into the reactor body 11 at an angle from top to bottom, and their output ends directly convey the raw material to the axial side region of the blades in the blade assembly near the bottom of the reactor body 11 (see...). Figure 2 (As shown). Flow field simulation in the reactor body 11 revealed that the flow rate of the liquid material is highest in the axial side region of the blades near the bottom of the reactor body 11 in the blade assembly. The first feed pipe 121, the second feed pipe 122, and the third feed pipe 12 directly transport the raw materials to the axial side region of the blades near the bottom of the reactor body 11 in the blade assembly, which can quickly and evenly mix the raw materials and start the reaction.

[0053] pass Figure 2 It can be seen that the crystallization equipment of Method 1 requires the reactor body 11 to have a larger diameter to accommodate the filter element assembly 34. Therefore, the larger diameter of the reactor body 11 in Method 1 allows for a larger capacity. Thus, the reactor body 11 of Method 1 is suitable as a large-capacity crystallization device, for example, with a volume of 8m³. 3 -15m 3 Crystallization equipment.

[0054] Method 2

[0055] Figure 3 This is a schematic diagram of a second embodiment of a crystallization apparatus according to this application. Figure 3 As shown, in the crystallization equipment of Method 2, the filtration device 3 includes a filter element mounting tube 35, which is installed in the reactor body 11 and close to the bottom of the reactor body 11. The filter element mounting tube 35 extends circumferentially along the reactor body 11. The filter element mounting tube 35 is provided with a clear liquid output section and a plurality of filter element mounting sections spaced apart along the length direction of the filter element mounting tube 35. The plurality of filter element mounting sections are used to install filter elements 31 and guide the clear liquid output by the filter elements 31 into the filter element mounting tube 35 and then discharge it through the clear liquid output section. The clear liquid output section is connected to the clear liquid output pipeline 32. The filter elements 31 on the filter element mounting tube 35 are all arranged vertically above the filter element mounting tube 35.

[0056] The filter element arrangement used in the crystallization equipment of Method Two is actually the same as that used in existing filtration concentrators. Typically, the filter element mounting tube 35 is a complete or incomplete annular tube. Each of the multiple filter element mounting sections includes a filter element connector 351 welded to the filter element mounting tube 35. The weld between the filter element mounting tube 35 and the filter element connector 351 is located on the tube wall of the filter element mounting tube 35. The top of the filter element connector 35 has an internal thread, which is adapted to match the external thread of the mounting connector on the filter element 31. During filter element installation, the filter element connector 351 is connected to the mounting connector by rotating the filter element 31 as a whole.

[0057] Figure 11 A photograph of the actual filter element connector welded onto the existing filter element mounting tube. Based on... Figure 11 As can be seen, since the filter element mounting tube 35 is an annular tube, to weld the filter element connector 351 onto the filter element mounting tube 35, it is first necessary to machine holes with edges that match the intersection line on the intersecting surface of the filter element mounting tube 35 and the filter element connector 351, and then weld the filter element mounting tube 35 and the filter element connector 351 along the intersection line. This processing method is relatively complicated, resulting in high processing costs; positioning and welding the filter element connector 351 on the annular tube is difficult, resulting in low overall processing quality. In addition, since the filter element connector 351 and the mounting joint are connected by threads, the filter element 31 needs to be rotated as a whole to achieve the connection between the filter element connector 351 and the mounting joint when installing the filter element, making the installation of the filter element 31 time-consuming and labor-intensive.

[0058] Therefore, in developing the crystallization equipment of method two, the following improvements were made specifically to the filter element mounting tube 35. These improvements can be implemented individually or in combination.

[0059] Improvement 1

[0060] Figure 5 This is a schematic diagram of a filter element installation structure according to an embodiment of this application. Figure 6 for Figure 5 A partial schematic diagram of the filter element installation structure shown. Figure 12 This is a schematic diagram of a filter element mounting tube in a filter element mounting structure according to an embodiment of this application. Figure 5-Figure 5 as well as Figure 12As shown, in this filter element mounting structure, the filter element mounting tube 35 extends in a circumferentially curved manner, and the filter element mounting tube 35 is provided with a clear liquid output section and a plurality of filter element mounting sections spaced apart along the length direction of the filter element mounting tube. The plurality of filter element mounting sections are used to install filter elements 31 and to guide the clear liquid output from the filter elements 31 into the filter element mounting tube 35 and then discharge it through the clear liquid output section. The filter element mounting tube 35 includes a curved section and straight pipe sections 353 located at both ends of the curved section 352. At least the plurality of filter element mounting sections and the clear liquid output section are located on the straight pipe sections 353.

[0061] Previously, the filter element mounting tube 35 was a complete or incomplete annular tube with multiple filter element mounting parts spaced apart along its length. However, manufacturing multiple filter element mounting parts on an annular tube was difficult. The improved filter element mounting tube 35 includes a curved section 352 and straight sections 353 located at both ends of the curved section 352. At least one of the multiple filter element mounting parts and the clear liquid output section is located on the straight sections 353, thus allowing multiple filter element mounting parts to be manufactured on the straight sections 353. The curved section 352 creates an angle between adjacent straight sections 353 on the filter element mounting tube 35, allowing the filter element mounting tube 35 to still "extend in a circumferential curved manner."

[0062] The included angle between adjacent straight pipe sections 353 on the filter element mounting pipe 35 is usually 100°-170°, such as any one of 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 140°, 145°, 150°, 155°, 160°, and 165°.

[0063] In one optional embodiment, the bent section 352 is formed by bending the multiple filter element mounting portions on the straight pipe blank where the straight pipe section 353 is located. The unbent portion of the straight pipe blank forms the straight pipe section 353. In this way, all the filter element mounting portions on the entire filter element mounting pipe 35 can be machined on the straight pipe blank, and the bent portion does not form the straight pipe section 353 when the straight pipe blank is bent. Therefore, the filter element mounting portions on the straight pipe section 353 are not affected by bending.

[0064] In one optional embodiment, at least one of the plurality of filter element mounting portions and the clear liquid output portion includes a flanged hole 354 integrally formed with the filter element mounting tube. The flanged hole 354 is manufactured using a hole-drawing process. Since at least one of the plurality of filter element mounting portions and the clear liquid output portion includes a flanged hole 354 integrally formed with the filter element mounting tube, the filter element connector 351 can be fixed to the flanged hole 354 instead of being directly fixed to the wall of the straight pipe section 353. This avoids the intersection line problem caused by the direct intersection of the filter element connector 351 and the wall of the straight pipe section 353. Currently, when manufacturing the flanged hole 354 using the hole-drawing process, the hole-drawing machine and its mold can individually draw holes on the straight pipe to manufacture all the flanged holes 354, resulting in high processing efficiency.

[0065] In one optional embodiment, the bent section 352 is formed by processing the multiple filter element mounting parts corresponding to the flip holes 354 on the straight pipe blank where the straight pipe section 353 is located using a hole-pulling device, and then bending it.

[0066] In one optional embodiment, the plurality of filter element mounting parts each include a filter element connector 351 welded to the corresponding flip hole 354, and the weld between the flip hole 354 and the filter element connector 351 is located on the mating end face between the flip hole 354 and the filter element connector 351.

[0067] In one optional embodiment, the bent section 352 is formed by processing the multiple filter element mounting parts corresponding to the multiple flip holes 354 on the straight pipe blank where the straight pipe section 353 is located using a hole-pulling device, and then welding the filter element joints 351 on the corresponding flip holes 354 and bending them.

[0068] In one optional embodiment, the filter element mounting tube 35 consists of a curved section 352 and two straight pipe sections 353 located at both ends of the curved section 352. The filter element mounting parts on the two straight pipe sections 353 are spaced at the same interval, but the lengths of the two straight pipe sections 353 are different and the number of filter element mounting parts provided is also different.

[0069] Based on the above improvement one, such as Figures 5-6As shown, the filtration device 3 may include independent filter element mounting tubes 35 arranged circumferentially and radially along the reactor body 11. The clear liquid output section of these independent filter element mounting tubes 35 discharges clear liquid from the reactor 1 through an independent clear liquid output tube 321 connected to the clear liquid output section. Furthermore, the line connecting the center of any filter element 31 on one of any two adjacent filter element mounting tubes 35 arranged radially along the reactor body 11 to the center of the nearest filter element 31 on the other filter element mounting tube 35 is deviated from the diameter direction of the reactor body 11.

[0070] Since the clear liquid output section of each filter element mounting pipe 35 discharges the clear liquid from the reactor 1 through an independent clear liquid output pipe 321 that is connected one-to-one with the clear liquid output section, instead of connecting the clear liquid output sections of each filter element mounting pipe 35 together in the reactor body 11 and then passing them out of the reactor 1, it is convenient to assemble the clear liquid output pipe 32 in the reactor 1.

[0071] Furthermore, a backwash control valve can be installed on the outside of each clear liquid output pipe 321 located on the reactor 1. The backwash control valve is used to connect to the filter cartridge backwashing system (mainly including the backwasher 331 in the clearing system 33 and related pipes and valve components). Thus, the filter cartridge 31 on each filter cartridge mounting pipe 35 can be backwashed independently.

[0072] from Figure 5As can be seen, the filtration device 3 includes four sets of filter element mounting tubes 35. Each set of filter element mounting tubes 35 has three filter element mounting tubes 35 arranged radially at intervals along the reactor body 11. These four sets of filter element mounting tubes 35 are arranged circumferentially at intervals along the reactor body 11, so the total number of filter element mounting tubes 35 is 12. The length of the three filter element mounting tubes 35 arranged radially at intervals along the reactor body 11 in each set gradually increases from the inside to the outside in the radial direction. Each of these three filter element mounting tubes 35 arranged radially at intervals along the reactor body 11 consists of a curved section 352 and two straight tube sections 353 located at both ends of the curved section 352. The filter element mounting parts on these two straight tube sections 353 are spaced at the same interval, but the lengths of the two straight tube sections 353 are different and the number of filter element mounting parts is also different. In this way, in each set of filter element mounting tubes 35, the filter elements 31 on two adjacent filter element mounting tubes 35 are staggered, so that the line connecting the center of any filter element 31 on one filter element mounting tube 35 and the center of the nearest filter element 31 on the other filter element mounting tube 35 in any two adjacent filter element mounting tubes 35 arranged radially at intervals along the reactor body 11 is deviated from the diameter direction of the reactor body 11, thereby avoiding some filter elements 31 being blocked by the surrounding filter elements 31 and reducing the filtration throughput.

[0073] Improvement 2

[0074] Figure 12 This is a schematic diagram of a filter element mounting tube in a filter element mounting structure according to an embodiment of this application. Figure 12 As shown, in this filter element installation structure, the filter element installation tube 35 is provided with a clear liquid output section and a plurality of filter element installation sections spaced apart along the length direction of the filter element installation tube. The plurality of filter element installation sections are used to install filter elements and guide the clear liquid output by the filter elements into the filter element installation tube and discharge it through the clear liquid output section. The plurality of filter element installation sections each include a flip hole 354 integral with the filter element installation tube 35 and a filter element connector 351 welded to the flip hole. The weld between the flip hole 354 and the filter element connector 351 is located on the mating end face between the flip hole 354 and the filter element connector 351.

[0075] Since the multiple filter element mounting sections each include a flanged hole 354 integrated with the filter element mounting tube, the filter element connector 351 is fixed to the flanged hole 354 instead of being directly fixed to the pipe wall of the straight pipe section 353. This avoids the intersection line problem caused by the direct intersection of the filter element connector 351 and the pipe wall of the filter element mounting tube 35. The weld between the flanged hole 354 and the filter element connector 351 is located on the mating end face between the flanged hole 354 and the filter element connector 351. A welding bevel can also be provided on the mating end face (see...). Figure 14 It is easy to weld and the welding quality is easy to guarantee.

[0076] In one optional embodiment, the perforation 354 is formed by a hole-drawing process. Optionally, the perforations 354 corresponding to the plurality of filter element mounting portions are formed on a straight tube blank by a hole-drawing device, and the straight tube blank is assembled to form the filter element mounting tube 35.

[0077] In one optional embodiment, the filter element mounting tube 35 includes an elbow joint and two straight tube blanks respectively assembled at both ends of the elbow joint, the elbow joint and the two straight tube blanks respectively assembled at both ends of the elbow joint forming a tubular structure that extends in a circumferential bend.

[0078] In one specific embodiment, the elbow is connected to the straight tube blank via a threaded connection structure or a welded structure. Optionally, the filter element mounting tube consists of an elbow and two straight tube blanks respectively assembled at both ends of the elbow. The filter element mounting portions on the two straight tube blanks are spaced at the same interval, but the lengths of the two straight tube blanks are different and the number of filter element mounting portions provided is also different.

[0079] In one optional embodiment, the included angle between adjacent straight tube blanks on the filter element mounting tube is 100°-170°, for example, any one of 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 140°, 145°, 150°, 155°, 160°, and 165°.

[0080] Based on the above improvement two, it is also possible to... Figures 5-6 As shown, the filtration device 3 may include independent filter element mounting tubes 35 arranged circumferentially and radially along the reactor body 11. The clear liquid output section of these independent filter element mounting tubes 35 discharges clear liquid from the reactor 1 through an independent clear liquid output tube 321 connected to the clear liquid output section. Furthermore, the line connecting the center of any filter element 31 on one of any two adjacent filter element mounting tubes 35 arranged radially along the reactor body 11 to the center of the nearest filter element 31 on the other filter element mounting tube 35 is deviated from the diameter direction of the reactor body 11.

[0081] Improvement 3

[0082] Figure 13 This is a schematic diagram of a filter element installation structure according to an embodiment of this application. Figure 13As shown, the filter element mounting structure includes a filter element mounting tube 35, which has a clear liquid output section and a plurality of filter element mounting sections spaced apart along the length of the filter element mounting tube 35. The plurality of filter element mounting sections are used to mount filter elements 31 and guide the clear liquid output from the filter elements 31 into the filter element mounting tube 35 before discharging it through the clear liquid output section. Each of the plurality of filter element mounting sections includes a filter element connector 351 disposed on the filter element mounting tube 35. The filter element connector 351 is connected to the mounting connector 311 of the filter element 31 via a connecting mechanism 36. Furthermore, a filter element is mounted on the filter element connector 351. The connecting mechanism 36 has a first mating part on the connector side and a second mating part on the filter element connector side. The mounting connector 311 has a first mating part on the mounting connector side and a second mating part on the mounting connector side. After the filter element connector 351 is connected to the mounting connector 311 of the filter element through the connecting mechanism 36, the first mating part on the filter element connector side mates with the first mating part on the mounting connector side. The second mating part on the filter element connector side and the second mating part on the mounting connector side respectively mate with the first mating part on the connecting mechanism side and the second mating part on the connecting mechanism side.

[0083] In one optional embodiment, the filter element connector 351 has a filter element connector side flange 3511, the outer end face of the filter element connector side flange 3511 forms a first mating portion on the filter element connector side, and the inner end face of the filter element connector side flange forms a second mating portion on the filter element connector side; the mounting connector 311 has a mounting connector side flange 3111, the outer end face of the mounting connector side flange 3111 forms a first mating portion on the mounting connector side, and the inner end face of the mounting connector side flange 3111 forms a second mating portion on the mounting connector side; the connecting mechanism 36 has a snap-fit ​​member 36. 1. One side wall of the slot of the snap-fit ​​member 361 forms a first mating part on the side of the connecting mechanism, and the other side wall of the slot of the snap-fit ​​member 361 forms a second mating part on the side of the connecting mechanism; after the filter element connector 351 is connected to the mounting connector 311 of the filter element 31 through the connecting mechanism 36, the outer end face of the flange 3511 on the side of the filter element connector and the outer end face of the flange 3111 on the side of the mounting connector are in contact with each other, and the flange 3511 on the side of the filter element connector and the flange 3111 on the side of the mounting connector are simultaneously snapped into the slot of the snap-fit ​​member 361 and clamped by the two side walls of the slot.

[0084] Typically, a sealing ring is installed between the outer end face of the filter element connector side flange 3511 and the outer end face of the mounting connector side flange 3111.

[0085] Furthermore, the snap-fit ​​member 361 may also include a snap ring formed by a first semi-annular portion and a second semi-annular portion that are detachably connected, wherein an annular snap groove is provided on the inner annular surface of the snap ring. The first semi-annular portion and the second semi-annular portion are detachably connected by a threaded connector 362.

[0086] Previously, because the filter element connector 351 and the mounting connector were connected by threads, the filter element 31 needed to be rotated as a whole to connect the filter element connector 351 and the mounting connector during filter element installation, which was time-consuming and laborious. In the filter element installation structure of the above-mentioned Improvement 3, the filter element connector 351 and the mounting connector 311 are quickly snapped together by the connecting mechanism 36, which can greatly improve the working efficiency of installing the filter element 31 on the filter element installation tube 35.

[0087] The diameter of the reactor body 11 in the crystallization equipment of method two can be significantly reduced compared to the diameter of the reactor body 11 in the crystallization equipment of method one. Therefore, the reactor body 11 of the crystallization equipment of method two is suitable as a small to medium capacity crystallization equipment, for example, with a volume of 1m³. 3 -6m 3 Crystallization equipment, especially those with a volume of 1.5m³. 3 -3m 3 Crystallization equipment.

[0088] Method 3

[0089] Figure 4 This is a schematic diagram of a crystallization apparatus according to an embodiment of this application, representing a third configuration. Figure 4 As shown, in the crystallization equipment of Method 3, the filtration device 3 includes a filter element mounting tube 35, which is installed in the reactor body 11 and close to the top of the reactor body 11. The filter element mounting tube 35 extends circumferentially along the reactor body 11. The filter element mounting tube 35 is provided with a clear liquid output section and a plurality of filter element mounting sections spaced apart along the length direction of the filter element mounting tube 35. The plurality of filter element mounting sections are used to install filter elements 31 and guide the clear liquid output by the filter elements 31 into the filter element mounting tube 35 and then discharge it through the clear liquid output section. The clear liquid output section is connected to the clear liquid output pipeline 32. The filter elements 31 on the filter element mounting tube 35 are all arranged vertically below the filter element mounting tube 35.

[0090] Compared to the crystallization equipment of Method 2, the main difference in Method 3 is that the filter element mounting tube 35 is moved upwards to near the top of the reactor body 11, and then the filter element 31 on the filter element mounting tube 35 is arranged below the filter element mounting tube 35. This structure is an innovative design that can be used in the crystallization equipment of this application as well as in conventional filtration concentrators. The advantages of the crystallization equipment of Method 3 are mainly: First, since the filter element 31 is suspended in the reactor body 11, it can effectively prevent the crystallized particles in the feed liquid from accumulating at the bottom of the filter element 31, especially around the filter element mounting tube 35, thus preventing them from flowing sufficiently, improving the consistency of the crystallized particles, and facilitating cleaning of the reactor body 11. Second, refer to Figures 1-2 It is known that the flow rate of the liquid is highest in the axial side region of the blades near the bottom of the reactor body 11 in the blade assembly. Therefore, the first feed pipe 121, the second feed pipe 122, and the third feed pipe 12 preferably directly transport the raw material to the axial side region of the blades near the bottom of the reactor body 11 in the blade assembly, which can make the raw material mix evenly and start the reaction as soon as possible. At this time, if the crystallization equipment of method three is used, the filter element 31 is far away from the outlet of the first feed pipe 121, the second feed pipe 122, and the third feed pipe 12, which not only helps the liquid to react, but also effectively prevents the liquid from being filtered out through the filter element 31 before it has fully reacted. Thirdly, the diameter of the reactor body 11 of the crystallization equipment of method three can be greatly reduced compared with the diameter of the reactor body 11 of the crystallization equipment of method one. Therefore, the reactor body 11 of the crystallization equipment of method one is also suitable as a small and medium capacity crystallization equipment, for example, a volume of 1m³. 3 -6m 3 Crystallization equipment, especially those with a volume of 1.5m³. 3 -3m 3 Crystallization equipment.

[0091] In one optional embodiment, the plurality of filter element mounting portions each include a filter element connector 351 disposed on the filter element mounting tube 35. The filter element connector 351 has a vertical pipe section 3512 with a length greater than twice the diameter of the filter element mounting tube, and the vertical pipe section 3512 is located between the head of the filter element connector 351 and the side wall of the filter element mounting tube 35. This allows the filter element to be positioned slightly above and to the side of the impeller assembly without increasing the filter element length, which is a preferred position for filter element placement.

[0092] In one optional embodiment, the vertical pipe section 3512 is welded to the flange on the filter element mounting pipe 35. The manufacturing process of the flange can be found in the foregoing section of this specification.

[0093] In addition to the methods mentioned above, manholes are usually required on the reactor body 11 of the crystallization equipment to allow operators to enter the reactor body 11 for related operations, such as loading and unloading filter elements. It is very common to install manholes on the shells of reactors and filtration concentrators, but existing manholes are independently located on the shell and require specialized design (mainly positioning) and manufacturing.

[0094] Considering that the stirring device includes a drive assembly, a shaft assembly, and a blade assembly, the drive assembly is mounted on the upper surface of the reactor body 11, the upper end of the shaft assembly is connected to the drive assembly and the lower end extends into the reactor body 11, and the blade assembly is mounted on the shaft assembly, it is necessary to open a hole on the upper surface of the reactor body 11 in order to connect the upper end of the shaft assembly to the drive assembly and extend the lower end into the reactor body 11. Therefore, this opening can be cleverly used as a manhole, thus forming such a structure (see reference). Figure 7 As shown): A manhole 112 is provided on the upper surface of the reactor body 11. The drive assembly 21 is installed on the manhole 112 through a flange connection structure 113. The manhole 112 can be opened when the flange connection structure 113 is disassembled. This greatly simplifies the design and manufacturing process.

[0095] Specifically, the flange connection structure 113 includes a lower flange ring disposed around the edge of the manhole and an upper flange end cap located above the lower flange ring; the drive assembly 21 is fixed to the upper flange end cap.

[0096] It should be noted that the aforementioned manhole design can be applied not only to the crystallization equipment of this application but also to a filtration and concentrator. The filtration and concentrator typically includes a cylinder, a stirring device, and a filtration device. The stirring device comprises a drive assembly, a shaft assembly, and a paddle assembly. The drive assembly is mounted on the upper end face of the cylinder. The upper end of the shaft assembly is connected to the drive assembly, and the lower end extends into the cylinder. The paddle assembly is mounted on the shaft assembly. The filtration device includes at least one set of filter elements, which are installed inside the cylinder and located beside the shaft assembly and / or the paddle assembly. The at least one set of filter elements is connected to a clear liquid output pipeline, which extends to the outside of the cylinder.

[0097] In addition to the methods mentioned above, a level gauge 4 is typically installed in the crystallization equipment. The level gauge 4 is used to detect the liquid level in the reactor body 11, so as to control the addition of raw materials for the crystallization reaction and the operation of the filtration device 3. In one control mode, when the level gauge detects that the liquid level in the reactor body 11 has risen to a set first threshold, the filtration device 3 is activated; when the level gauge detects that the liquid level in the reactor body 11 has fallen to a set second threshold, the addition of raw materials for the crystallization reaction is initiated.

[0098] Previously, the level gauge probe of level gauge 4 was directly inserted into the container. However, because the liquid in the reactor body 11 is constantly agitated, this easily causes level gauge 4 to shake, leading to a decrease in its detection accuracy. Therefore, it was considered to add a level gauge sleeve to the outside of the level gauge probe. The inside of the level gauge sleeve is connected to the reactor body 11, so that the liquid level in the reactor body 11 is consistent with the liquid level inside the level gauge sleeve, and the liquid in the level gauge sleeve is relatively stable, thereby improving detection accuracy. However, in actual implementation, it was found that the level gauge probe is prone to contact or impact with the level gauge sleeve, affecting detection accuracy.

[0099] Figure 8 This is a schematic diagram of the structure of a level gauge sleeve according to an embodiment of this application. Figure 9 This is a schematic diagram of the radial positioning structure of a level gauge in a level gauge sleeve according to an embodiment of this application. Figure 10 This is a schematic diagram illustrating the fit between the radial positioning structure of the level gauge and the body of the level gauge sleeve in an embodiment of this application. Figures 8-10As shown, an improved level gauge sleeve includes a sleeve body 41 for fitting around the level gauge probe at a certain distance from it. The sleeve body 41 has an axially extending strip-shaped hole 411 on its side wall. A level gauge radial positioning structure 42 is installed within the sleeve body 41 and used to radially position the level gauge probe fitted within it. The portion of the radial positioning structure 42 that contacts the level gauge probe is made of a material that does not affect level gauge detection. The radial positioning structure 42 also forms an axial flow channel within the sleeve body 41. The interior of the level gauge sleeve body 41 is connected to the reactor body 11, ensuring that the liquid level in the reactor body 11 is consistent with the liquid level in the level gauge sleeve body 41. This also results in a relatively stable liquid state within the level gauge sleeve body 41, thereby improving detection accuracy. Furthermore, since the level gauge radial positioning structure 42 in the level gauge sleeve body 41 is used to radially position the level gauge probe rod fitted in the sleeve body 41, the part of the level gauge radial positioning structure 42 that contacts the level gauge probe rod is made of a material that does not affect the level gauge detection (for example, the entire level gauge sleeve body 41 can be made of nylon material). In addition, the level gauge radial positioning structure 42 forms an axial flow channel in the sleeve body 41, thus further preventing the level gauge probe rod from contacting or colliding with the level gauge sleeve body 41, while not affecting the detection.

[0100] Specifically, the radial positioning structure 42 of the level gauge may include a retaining ring 421, which is used to be fitted onto the level gauge probe. The outer side wall of the retaining ring 421 is adapted to the inner side wall of the sleeve body 41. The retaining ring 421 has circumferentially spaced axial through holes 4211 to form the axial flow channel.

[0101] Furthermore, the through hole in the retaining ring 421 for cooperating with the level gauge probe includes a level gauge probe mounting hole 4212 located at the upper part of the retaining ring 421 and a tapered diffusion hole 4213 located at the lower part of the retaining ring. The upper constricted end of the tapered diffusion hole 4213 is connected to the lower port of the level gauge probe mounting hole 4212, and the lower enlarged end of the tapered diffusion hole 4213 is located on the lower end face of the retaining ring 421. The included angle between the two side walls of the tapered diffusion hole 4213 is generally 30°-70°, for example, any one of 35°, 40°, 45°, or 50°.

[0102] By designing the through hole in the retaining ring 421 for mating with the level gauge probe to include a level gauge probe mounting hole 4212 located at the upper part of the retaining ring 421 and a tapered diffuser hole 4213 located at the lower part of the retaining ring, the contact area between the retaining ring 421 and the level gauge probe is minimized, ensuring the detection accuracy of the level gauge 4. Furthermore, the tapered diffuser hole 4213 allows the force exerted on the retaining ring 421 when the liquid passes through it to be decomposed into a radial force, reducing the axial force on the retaining ring 421 and preventing axial movement of the retaining ring 421.

[0103] Furthermore, a flange 4214 may be provided on the outer peripheral wall of the retaining ring 421, and a retaining ring positioning member is provided on the side wall of the sleeve body 41. The retaining ring positioning member engages with the outer surface or lower end face of the flange 4214, thereby positioning the retaining ring in the axial direction and radial direction of the sleeve body, at least in the axial direction. Specifically, a plurality of locking bolts 412 are provided at intervals along the circumference of the sleeve body on the side wall of the sleeve body, and the plurality of locking bolts 412 serve as retaining ring positioning members.

[0104] Furthermore, the upper end face and outer side face of the retaining ring 421 form a tapered chamfer 4215. The included angle between the tapered chamfers 4215 on both sides of the retaining ring 421 is 50°-80°, for example, any one of 55°, 60°, 65°, and 70°. The projected length of the tapered chamfers 4215 on the upper end face of the retaining ring is more than 1 / 4 of the outer diameter of the retaining ring. In this way, the tapered chamfer 4215 allows the force applied to the retaining ring 421 when the liquid passes through it to be decomposed into a portion of the radial force, reducing the axial force on the retaining ring 421 and preventing axial movement of the retaining ring 421.

[0105] In addition, the level gauge sleeve may also include a level gauge axial positioning structure 43, which is disposed at the level gauge insertion end of the sleeve body 41 for axial engagement with the level gauge. The axial positioning structure 43 may be a flange for connection with the flange on the level gauge probe, thereby achieving axial positioning.

[0106] It should be noted that the above-mentioned design of the liquid level gauge sleeve can be applied not only to the crystallization equipment of this application, but also to the filtration and concentrator. The filtration and concentrator typically includes a cylinder, a stirring device, and a filtration device; the stirring device includes a drive assembly, a shaft assembly, and a blade assembly. The drive assembly is mounted on the upper end face of the cylinder, the upper end of the shaft assembly is connected to the drive assembly, and the lower end extends into the cylinder. The blade assembly is mounted on the shaft assembly. The filtration device includes at least one set of filter elements, which are installed inside the cylinder and located beside the shaft assembly and / or the blade assembly. The at least one set of filter elements is connected to a clear liquid output pipeline, which extends to the outside of the cylinder.

[0107] The foregoing has described the relevant content of this application. Those skilled in the art will be able to implement this application based on these descriptions. All other embodiments obtained by those skilled in the art based on the foregoing content of this specification without inventive effort should fall within the scope of patent protection.

Claims

1. A liquid level gauge sleeve, characterized in that, include: A sleeve body is used to fit over the outside of the level gauge probe and is spaced a certain distance from the level gauge probe; and an axially extending strip-shaped hole is formed on the side wall of the sleeve body; and A level gauge radial positioning structure is installed in the sleeve body and used to radially position the level gauge probe rod fitted in the sleeve body. The part of the level gauge radial positioning structure that contacts the level gauge probe rod is made of a material that does not affect the level gauge detection. Furthermore, the level gauge radial positioning structure forms an axial flow channel in the sleeve body. The radial positioning structure of the liquid level gauge includes a retaining ring, which is used to fit onto the liquid level gauge probe. The outer side wall of the retaining ring is adapted to the inner side wall of the sleeve body. The retaining ring has circumferentially spaced axial through holes to form the axial flow channel. The through hole in the retaining ring for cooperating with the level gauge probe includes a level gauge probe mounting and mating hole located at the upper part of the retaining ring and a tapered diffusion hole located at the lower part of the retaining ring. The upper constricted end of the tapered diffusion hole is connected to the lower port of the level gauge probe mounting and mating hole, and the lower enlarged end of the tapered diffusion hole is located on the lower end face of the retaining ring.

2. The level gauge sleeve as described in claim 1, characterized in that: The included angle between the two sides of the tapered diffuser hole is 30°-70°.

3. The level gauge sleeve as described in claim 2, characterized in that: The included angle between the two sides of the tapered diffuser hole is any one of 35°, 40°, 45°, and 50°.

4. The liquid level gauge sleeve as described in claim 1, characterized in that: The outer peripheral wall of the retaining ring is provided with a flange, and the side wall of the sleeve body is provided with a retaining ring positioning member. The retaining ring positioning member is engaged with the outer side or lower end face of the flange, thereby positioning the retaining ring in the axial direction and radial direction of the sleeve body, at least in the axial direction of the sleeve body.

5. A level gauge sleeve as described in claim 4, characterized in that: Multiple locking bolts are provided at intervals around the circumference of the sleeve body on the side wall of the sleeve body, and the multiple locking bolts serve as the retaining ring positioning components.

6. A level gauge sleeve as described in claim 1, characterized in that: The upper end face and the outer side face of the retaining ring are tapered chamfered, and the included angle between the tapered chamfers on both sides of the retaining ring is 50°-80°. Furthermore, the projected length of the tapered chamfers on both sides of the retaining ring on the upper end face of the retaining ring is more than 1 / 4 of the outer diameter of the retaining ring.

7. A level gauge sleeve as described in claim 6, characterized in that: The included angle between the tapered chamfers on both sides of the retaining ring is any one of 55°, 60°, 65°, and 70°.

8. A level gauge sleeve as described in claim 1, characterized in that: It includes an axial positioning structure for the level gauge, which is disposed at the level gauge insertion end of the sleeve body and is used to axially engage with the level gauge.

9. A level gauge assembly, comprising a level gauge, characterized in that: It also includes a level gauge sleeve as described in any one of claims 1-8, wherein the level gauge and the level gauge sleeve are assembled together.

10. A filtration and concentrating machine, comprising: cylindrical body; A stirring device includes a drive assembly, a transmission assembly, and a liquid agitation assembly. The drive assembly provides initial power to the stirring device, and the transmission assembly transmits the initial power to the liquid agitation assembly. The liquid agitation assembly contacts the liquid inside the cylinder and agitates the liquid under the drive of the transmission assembly. A filtration device includes at least one set of filter elements, the at least one set of filter elements being installed inside the cylinder, the at least one set of filter elements being connected to a clear liquid output pipeline, the clear liquid output pipeline extending to the outside of the cylinder; Its features are: A level gauge assembly is installed on the cylinder and inserted into the cylinder from top to bottom. The level gauge assembly is a level gauge assembly as described in claim 9.

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