A lithium hexafluorophosphate crystallization device without disassembling a refrigerant pipe

Abstract

The present application relates to lithium hexafluorophosphate production technical field, and disclose a kind of lithium hexafluorophosphate crystallization device without dismounting refrigerant pipeline, including first cylinder, second cylinder and rotating disc, one end face of the first cylinder is fixedly connected with second cylinder, the one end of the first cylinder away from second cylinder is rotatably connected with rotating disc by bearing, the one end of the rotating disc away from first cylinder is fixedly connected with air inlet assembly, the second cylinder outside is fixedly connected with air outlet assembly, the first cylinder outside is equipped with the through-hole being communicated with second cylinder interior;The air inlet assembly includes multiple U-shaped tubes, upper head and first connecting flange.The lithium hexafluorophosphate crystallization device without dismounting refrigerant pipeline, with when discharging crystallization device without dismounting refrigerant hose, ensure refrigerant pipeline continuous connection, reduce personnel operation, eliminate refrigerant quality reduction and personnel injury risk, improve lithium hexafluorophosphate production efficiency and the like advantages.

Description

Technical Field

[0001] This invention relates to the field of lithium hexafluorophosphate production technology, specifically to a lithium hexafluorophosphate crystallization device that does not require disassembly of refrigerant pipelines. Background Technology

[0002] With the global energy structure shifting towards clean energy and the in-depth implementation of my country's new energy strategy, the market demand for lithium-ion batteries, as the core carrier for new energy storage and application, is experiencing explosive growth. Lithium hexafluorophosphate (LiPF6), as the core solute in lithium-ion battery electrolytes, directly determines the voltage level, specific energy density, and cycle life of lithium-ion batteries, and is a key raw material to ensure the high performance of lithium-ion batteries.

[0003] Currently, the mainstream industrial production process for lithium hexafluorophosphate is the HF solvent method. The crystallization process is the core step in separating, purifying, and obtaining high-purity lithium hexafluorophosphate products. The performance of the crystallization device directly affects production efficiency and product quality. Existing lithium hexafluorophosphate crystallization processes mostly employ static crystallization technology. The corresponding crystallization device mainly consists of a cylinder, end caps, a rotating shaft, and external fixed refrigerant pipes. The workflow is as follows: During the crystallization stage, the refrigerant hose needs to be manually connected to the refrigerant interface of the cylinder, and cooling and crystallization are achieved through refrigerant circulation. After crystallization, the refrigerant hose must be disassembled before driving the crystallization device to rotate and discharge the material, to prevent the hose from being pulled and broken during the discharge process.

[0004] However, in actual operation, the refrigerant hoses need to be manually connected to the crystallization device, resulting in low production efficiency, increased workload for operators, and safety risks. Furthermore, frequent disassembly and installation of pipes leads to refrigerant material loss and introduces moisture and air into the refrigerant, leaving ice and other substances inside the pipes, affecting refrigerant quality and heat exchange efficiency. Moreover, when the refrigerant hoses are removed, the refrigerant inside exchanges heat with the air, causing a rapid temperature rise, which can easily lead to liquid phase expansion of the refrigerant and a risk of refrigerant splashing at the hose connections, resulting in economic losses and damage to personnel and the environment. Therefore, a lithium hexafluorophosphate crystallization device that does not require disassembly of refrigerant pipes is proposed to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a lithium hexafluorophosphate crystallization device that does not require disassembly of refrigerant pipes. It offers advantages such as maintaining continuous refrigerant pipe connection during discharge without disassembling the refrigerant hose, reducing manual operation, eliminating the risk of refrigerant quality degradation and personnel injury, and improving lithium hexafluorophosphate production efficiency. This invention solves the problems of low production efficiency, increased workload and safety risks associated with manually connecting refrigerant hoses to the crystallization device; frequent disassembly and installation of pipes leading to refrigerant material loss; and the introduction of moisture and air into the refrigerant, resulting in ice and other substances remaining in the pipes, affecting refrigerant quality and heat exchange efficiency. Furthermore, when the refrigerant hose is removed, the refrigerant inside the hose exchanges heat with the air, causing a rapid temperature rise that can lead to liquid phase expansion of the refrigerant and the risk of refrigerant splashing at the hose connection, resulting in economic losses and damage to personnel and the environment.

[0006] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A lithium hexafluorophosphate crystallization device that does not require disassembly of refrigerant pipes includes a first cylinder, a second cylinder, and a rotating disk. One end face of the first cylinder is fixedly connected to the second cylinder. The end of the first cylinder away from the second cylinder is rotatably connected to the rotating disk via a bearing. An air inlet assembly is fixedly connected to the end of the rotating disk away from the first cylinder. An air outlet assembly is fixedly connected to the outside of the second cylinder. A through hole communicating with the inside of the second cylinder is opened on the outside of the first cylinder. The air inlet assembly includes multiple U-shaped tubes, an upper end cap, and a first connecting flange. One end of the U-shaped tube is connected to the rotating disk. The first end of the upper end is connected to the second cylinder, and the second end is connected to the inside of the lower end. The upper end is a cylindrical structure with one open end and one closed end. The outer side of the open end of the upper end is fixedly connected to the first connecting flange, which is used for a detachable and sealed connection with the refrigerant inlet pipe. The second end of the lower end is connected to the inside of the second cylinder, and the other end is connected to the inside of the lower end. The lower end is a cylindrical structure with one open end and one closed end. The outer side of the open end of the lower end is fixedly connected to the second connecting flange, which is used for a detachable and sealed connection with the refrigerant outlet pipe.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, a plurality of support legs are fixedly connected to the outer wall of the second cylinder, and the plurality of support legs are distributed in a rectangular array along the circumference of the second cylinder. A shock-absorbing fixing component is fixedly connected to the outer side of the support leg away from the second cylinder.

[0009] Furthermore, the shock absorption and fixing assembly includes a spring-damped shock absorber, a base plate, and a connecting ring. One end of the spring-damped shock absorber is fixedly connected to the outer side of the support leg, and the other end is fixedly connected to the outer side of the base plate. The connecting ring is fixedly connected to the outer side of the base plate and is used for detachable and fixed connection with the mounting foundation.

[0010] Furthermore, it also includes a pressure relief assembly, which includes a pressure relief pipe, a solenoid valve, and a pressure sensor. One end of the pressure relief pipe is connected to the inner side of the first cylinder. The solenoid valve is fixedly connected to the inner side of the pressure relief pipe. The pressure sensor is fixedly installed inside the pressure relief pipe and located on the side of the solenoid valve closer to the first cylinder. The pressure sensor is signal-connected to the solenoid valve and is used to monitor the pressure inside the first cylinder in real time and control the opening and closing of the solenoid valve to achieve pressure relief.

[0011] Furthermore, a support rod is fixedly connected to the outer side of the first cylinder, and a protective shell is fixedly connected to the other end of the support rod. The air inlet assembly and the air outlet assembly are both located inside the protective shell.

[0012] Furthermore, four first partition plates are fixedly connected to the inner side of the first cylinder. The four first partition plates extend along the axial direction of the first cylinder and are evenly distributed along the circumference. A first air guide hole is opened on the outer side of the first partition plate. The four first partition plates divide the inner side of the first cylinder into four independent connecting cavities, which are sequentially the first cavity, the second cavity, the third cavity and the fourth cavity along the circumference of the first cylinder. The U-shaped tube is connected to the first cavity, and the through hole is connected to the third cavity.

[0013] Furthermore, two second partition plates are fixedly connected to the inner side of the second cylinder. The two second partition plates extend along the axial direction of the second cylinder and are arranged opposite to each other. A second air guide hole is opened on the outer side of the second partition plate. The two second partition plates divide the inner side of the second cylinder into two independent connecting cavities, namely the fifth cavity and the sixth cavity. The fifth cavity is connected to the through hole, and the sixth cavity is connected to the connecting pipe.

[0014] Furthermore, the cross-sectional diameter of the second cylinder is smaller than that of the first cylinder, and a concentration sensor is fixedly connected to the inner side of both the upper and lower end caps. The concentration sensor is used to detect the concentration of lithium hexafluorophosphate in the refrigerant.

[0015] The beneficial effects of this invention are: This lithium hexafluorophosphate crystallization device, which does not require disassembly of refrigerant pipes, has the advantages of ensuring continuous connection of refrigerant pipes during material discharge, reducing personnel operation, eliminating the risk of refrigerant quality degradation and personnel injury, and improving lithium hexafluorophosphate production efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3 This is a diagram showing the connection between the first and second cylinders of the present invention; Figure 4 This is a schematic diagram of the internal structure of the first cylindrical body of the present invention; Figure 5 This is a schematic diagram of the internal structure of the second cylinder of the present invention; Figure 6 This is a connection diagram of the pressure relief pipe and solenoid valve of the present invention; Figure 7 This is a connection diagram of the upper end cap and concentration sensor of the present invention.

[0017] In the diagram: 1. First cylinder; 2. Second cylinder; 3. Rotating disk; 4. Inlet assembly; 41. U-shaped pipe; 42. Upper end cap; 43. First connecting flange; 5. Outlet assembly; 51. Connecting pipe; 52. Lower end cap; 53. Second connecting flange; 6. Through hole; 7. Support leg; 8. Vibration damping fixing assembly; 81. Spring damping shock absorber; 82. Base plate; 83. Connecting ring; 9. Pressure relief assembly; 91. Pressure relief pipe; 92. Solenoid valve; 93. Pressure sensor; 10. Support rod; 11. Protective shell; 12. First partition; 13. First air guide hole; 14. Second partition; 15. Second air guide hole; 16. Concentration sensor. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1, by Figure 1-3 A lithium hexafluorophosphate crystallization device without disassembling refrigerant pipes is provided. The invention includes a first cylinder 1, a second cylinder 2, and a rotating disk 3. One end face of the first cylinder 1 is fixedly connected to the second cylinder 2. The end of the first cylinder 1 away from the second cylinder 2 is rotatably connected to the rotating disk 3 through a bearing. An air inlet assembly 4 is fixedly connected to the end of the rotating disk 3 away from the first cylinder 1. An air outlet assembly 5 is fixedly connected to the outside of the second cylinder 2. A through hole 6 communicating with the inside of the second cylinder 2 is opened on the outside of the first cylinder 1. The intake assembly 4 includes multiple U-shaped pipes 41, an upper end cap 42, and a first connecting flange 43. One end of the U-shaped pipe 41 is connected to the interior of the rotating disk 3, and the other end is connected to the interior of the upper end cap 42. The upper end cap 42 is a cylindrical structure with one end open and the other end closed. The outer side of the open end of the upper end cap 42 is fixedly connected to the first connecting flange 43. The first connecting flange 43 is used for a detachable and sealed connection with the refrigerant input pipe. The air outlet assembly 5 includes multiple connecting pipes 51, a lower end cap 52, and a second connecting flange 53. One end of the connecting pipe 51 is connected to the inside of the second cylinder 2, and the other end is connected to the inside of the lower end cap 52. The lower end cap 52 is a cylindrical structure with one end open and the other end closed. The outer side of the open end of the lower end cap 52 is fixedly connected to the second connecting flange 53. The second connecting flange 53 is used for a detachable and sealed connection with the refrigerant output pipeline.

[0020] The first connecting flange 43 and the second connecting flange 53 are respectively connected to the refrigerant input pipe and the refrigerant output pipe in a detachable and sealed manner. Combined with the connection structure between the U-shaped pipe 41 in the air intake assembly 4 and the rotating disk 3 and the upper end cap 42, and the connection structure between the connecting pipe 51 in the air outlet assembly 5 and the second cylinder 2 and the lower end cap 52, the stable input and output of refrigerant is achieved. At the same time, the device can be separated from the refrigerant pipeline without disassembling the refrigerant pipeline, which greatly simplifies the maintenance and repair process and reduces maintenance costs. Furthermore, the rotating connection design between the first cylinder 1 and the rotating disk 3, and the diversion and convergence design of multiple U-shaped pipes 41 and connecting pipes 51 ensure the smooth flow of refrigerant and improve the stability and efficiency of the lithium hexafluorophosphate crystallization process.

[0021] In this embodiment, multiple support legs 7 are fixedly connected to the outer wall of the second cylinder 2. The multiple support legs 7 are distributed in a rectangular array along the circumference of the second cylinder 2 to ensure that each support leg 7 is subjected to uniform force. Then, a shock-absorbing fixing component 8 is fixedly connected to the outer side of the end of each support leg 7 away from the second cylinder 2. The support legs 7 support the entire device, allowing the device to be separated from the mounting surface by a certain distance. At the same time, the shock-absorbing fixing component 8 is used to cooperate with the mounting foundation for fixation, so as to achieve stable installation of the device. The shock absorption and fixing assembly 8 is configured to include a spring-damped shock absorber 81, a base plate 82, and a connecting ring 83. One end of the spring-damped shock absorber 81 is fixedly connected to the outside of the support leg 7, and the other end is fixedly connected to the outside of the base plate 82, so that the spring-damped shock absorber 81 can play a buffering role between the support leg 7 and the base plate 82. The connecting ring 83 is then fixedly connected to the outside of the base plate 82. During installation, the connecting ring 83 is detachably fixed to the installation foundation, so that the base plate 82 is stably fixed on the installation foundation, thereby achieving stable fixing of the support leg 7 and the entire device.

[0022] By setting multiple support legs 7 arranged in a rectangular array along the circumferential direction on the outer wall of the second cylinder 2, the overall weight of the device is effectively distributed, improving the stability of the device after installation and preventing the device from tipping over due to the shift of the center of gravity. Furthermore, the support legs 7 are connected to the base plate 82 by spring damping shock absorbers 81. Utilizing the damping characteristics of the spring damping shock absorbers 81, the vibration energy generated during the operation of the device can be effectively absorbed, reducing vibration transmission and preventing vibration from causing loosening of device components or leakage at the refrigerant pipe connections. At the same time, the connecting ring 83 on the outer side of the base plate 82 enables a detachable and fixed connection with the installation foundation, which not only ensures the firmness of the device installation but also facilitates the disassembly and relocation of the device, further improving the practicality and ease of maintenance of the device.

[0023] Working principle: The entire device is axially installed on the support points at both ends of the crystallization device and fixed in a ring shape. At the same time, the first connecting flange 43 is connected to the outlet end of the refrigerant input pipe, and the second connecting flange 53 is connected to the inlet end of the refrigerant input pipe. Meanwhile, the entire device is fixed to the surface of the bearing seat of the crystallization device by the base plate 82 in the shock-absorbing and fixing assembly 8, thus completing the installation operation of the entire device. Cooling and crystallization stage: The cooling medium flows from the outlet end of the refrigerant inlet pipe, through the air inlet assembly 4, into the hollow rotating shaft, and then into the first cylinder 1. After completing the heat exchange, the medium flows out from the second cylinder 2, through the air outlet assembly 5, back to the inlet end of the refrigerant inlet pipe, and enters the external circulation system. At this time, the crystallization device is in a static state.

[0024] Discharge stage: The drive bearing drives the crystallization device to rotate, which in turn drives the air intake component 4 to rotate. At the same time, the rotating disk 3 will rotate. Other components will not rotate. The rotation of the equipment has no effect on the refrigerant pipeline. The temperature rise and fall program of the crystallization device can be run during the discharge stage.

[0025] This invention fundamentally eliminates the risks to operator safety, product quality, and environmental pollution caused by the need for manual disassembly of refrigerant hoses during the material discharge stage. It also reduces refrigerant loss and cooling capacity loss, effectively improving the efficiency of lithium hexafluorophosphate production processes and providing a pathway to achieve full automation of lithium hexafluorophosphate production.

[0026] Example 2, by Figure 4-5It is provided that four first partition plates 12 are fixedly connected to the inner side of the first cylinder 1, so that the four first partition plates 12 extend along the axial direction of the first cylinder 1 and are evenly distributed along the circumference of the first cylinder 1. A first air guide hole 13 is opened on the outer side of each first partition plate 12. The four first partition plates 12 divide the interior of the first cylinder 1 into four independent connecting cavities, which are defined sequentially as the first cavity, the second cavity, the third cavity and the fourth cavity along the circumference of the first cylinder 1. The U-shaped pipe 41 of the air intake assembly 4 is connected to the first cavity, so that the refrigerant flows out from the U-shaped pipe 41 and directly enters the first cavity. The through hole 6 on the outer side of the first cylinder 1 is connected to the third cavity. During operation, after the refrigerant enters the first cavity, it flows through the first air guide hole 13 on the first partition plate 12, sequentially through the second cavity and the fourth cavity, and finally gathers in the third cavity, and then flows into the interior of the second cylinder 2 through the through hole 6. Two second partition plates 14 are fixedly connected to the inner side of the second cylinder 2, so that the two second partition plates 14 extend along the axial direction of the second cylinder 2 and are arranged opposite each other. A second air guide hole 15 is opened on the outer side of each second partition plate 14. The two second partition plates 14 divide the interior of the second cylinder 2 into two independent connecting cavities, which are defined as the fifth cavity and the sixth cavity respectively. The fifth cavity is connected to the through hole 6 of the first cylinder 1, so that the refrigerant flowing out of the through hole 6 directly enters the fifth cavity. The sixth cavity is connected to the connecting pipe 51 of the air outlet assembly 5. When working, the refrigerant flows into the fifth cavity and then slowly flows into the sixth cavity through the second air guide hole 15 on the second partition plate 14. Heat exchange is completed during the flow process, and then it flows out of the second cylinder 2 through the connecting pipe 51.

[0027] In this embodiment, by setting targeted baffles and cavity structures in the first cylinder 1 and the second cylinder 2 respectively, the orderly optimization and coordinated matching of the refrigerant flow path inside the device are achieved. The first cylinder 1 is divided into four independent connecting cavities by four axially extending and circumferentially evenly distributed first partitions 12. These cavities are, in order, the first, second, third, and fourth cavities. The first air guide holes 13 on the first partitions 12 help the refrigerant form an orderly flow path. The second cylinder 2 is divided into two independent connecting cavities by two axially extending and oppositely arranged second partitions 14. These cavities are, in turn, the fifth and sixth cavities. The second air guide holes 15 on the second partitions 14 further regulate the refrigerant flow. The combined effect of these two systems not only extends the residence time of the refrigerant within the entire device but also makes the refrigerant distribution and flow velocity more stable, effectively avoiding insufficient local heat exchange. This significantly improves the heat exchange efficiency and uniformity between the refrigerant and the lithium hexafluorophosphate crystallization system. Furthermore, the staged cavity design facilitates the orderly flow, transition, and collection of the refrigerant, ensuring the stability of the refrigerant flow between the first cylinder 1 and the second cylinder 2. Together, these components provide a reliable guarantee for the stability of the lithium hexafluorophosphate crystallization quality and further optimize the crystallization effect of the entire device.

[0028] Example 3, by Figure 6 As shown, this embodiment adds a pressure relief component 9 based on embodiment one. The pressure relief component 9 includes a pressure relief pipe 91, a solenoid valve 92, and a pressure sensor 93.

[0029] One end of the pressure relief pipe 91 is connected to the inside of the first cylinder 1, allowing gas in the first cylinder 1 to flow into the pressure relief pipe 91. A solenoid valve 92 is fixedly connected inside the pressure relief pipe 91 to control the opening and closing of the pressure relief pipe 91. A pressure sensor 93 is fixedly installed inside the pressure relief pipe 91 and located on the side of the solenoid valve 92 close to the first cylinder 1, so that the pressure sensor 93 can directly monitor the pressure inside the first cylinder 1. The pressure sensor 93 is connected to the solenoid valve 92 for signal transmission. During operation, the pressure sensor 93 collects the pressure data inside the first cylinder 1 in real time. When the pressure data exceeds a preset threshold, the pressure sensor 93 sends a signal to control the solenoid valve 92 to open, and the high-pressure gas in the first cylinder 1 is discharged through the pressure relief pipe 91. When the pressure data drops to a preset safety threshold, the pressure sensor 93 sends a signal to control the solenoid valve 92 to close, stopping the pressure relief.

[0030] By setting up the pressure relief component 9, real-time monitoring and automatic pressure relief of the pressure inside the first cylinder 1 are realized. When the pressure inside the first cylinder 1 is too high, high-pressure gas can be discharged in time to avoid damage to components such as the first cylinder 1, rotating disk 3 or refrigerant pipeline due to excessive pressure, thus ensuring the safety and stability of the device operation. At the same time, the signal connection design between the pressure sensor 93 and the solenoid valve 92 realizes the automated control of the pressure relief process without manual intervention, thereby improving the overall usability of the device.

[0031] Example 4, by Figure 7 In this embodiment, the cross-sectional diameter of the second cylinder 2 is set to be smaller than that of the first cylinder 1. This causes a change in the flow space when the refrigerant flows from the first cylinder 1 into the second cylinder 2 through the through hole 6, promoting thorough mixing of the refrigerant. A concentration sensor 16 is fixedly connected to the inside of the upper end cap 42 and also to the inside of the lower end cap 52. During operation, the concentration sensor 16 in the upper end cap 42 detects the initial concentration of lithium hexafluorophosphate in the refrigerant entering the device in real time, and the concentration sensor 16 in the lower end cap 52 detects the final concentration of lithium hexafluorophosphate in the refrigerant flowing out of the device in real time. By comparing the concentration data of the two, the crystallization status of lithium hexafluorophosphate can be intuitively understood.

[0032] In embodiment five, a support rod 10 is fixedly connected to the outside of the first cylinder 1 to ensure a firm connection. The other end of the support rod 10 is fixedly connected to the protective shell 11. The support rod 10 supports and fixes the protective shell 11, so that the protective shell 11 covers the outside of the air intake assembly 4 and the air outlet assembly 5, and both the air intake assembly 4 and the air outlet assembly 5 are completely located inside the protective shell 11. At the same time, the diameter of the support rod 10 is smaller than the gap between the first connecting flange 43 and the second connecting flange 53, so that the air intake assembly 4 will not interfere with the support rod 10 during rotation, thus avoiding affecting the normal operation of the components.

[0033] The protective shell 11 is fixed by the support rod 10 on the outside of the first cylinder 1, and the air inlet assembly 4 and the air outlet assembly 5 are covered inside the protective shell 11. This can effectively prevent external dust and debris from corroding and damaging the U-shaped pipe 41, the first connecting flange 43 of the air inlet assembly 4, and the connecting pipe 51 and the second connecting flange 53 of the air outlet assembly 5. At the same time, it prevents personnel from accidentally touching the high-pressure refrigerant pipeline connection parts, reduces safety hazards, and ensures the service life of the air inlet assembly 4 and the air outlet assembly 5 and the safety of the device operation.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lithium hexafluorophosphate crystallization device that does not require disassembly of refrigerant pipes, characterized in that: The device includes a first cylinder (1), a second cylinder (2), and a rotating disk (3). One end face of the first cylinder (1) is fixedly connected to the second cylinder (2). The end of the first cylinder (1) away from the second cylinder (2) is rotatably connected to the rotating disk (3) through a bearing. An air inlet assembly (4) is fixedly connected to the end of the rotating disk (3) away from the first cylinder (1). An air outlet assembly (5) is fixedly connected to the outside of the second cylinder (2). A through hole (6) communicating with the inside of the second cylinder (2) is opened on the outside of the first cylinder (1). The air intake assembly (4) includes multiple U-shaped tubes (41), an upper end cap (42), and a first connecting flange (43). One end of the U-shaped tube (41) is connected to the interior of the rotating disk (3), and the other end is connected to the interior of the upper end cap (42). The upper end cap (42) is a cylindrical structure with one end open and the other end closed. The outer side of the open end of the upper end cap (42) is fixedly connected to the first connecting flange (43). The first connecting flange (43) is used for a detachable and sealed connection with the refrigerant input pipe. The air outlet assembly (5) includes multiple connecting pipes (51), a lower end cap (52), and a second connecting flange (53). One end of the connecting pipe (51) is connected to the interior of the second cylinder (2), and the other end is connected to the interior of the lower end cap (52). The lower end cap (52) is a cylindrical structure with one end open and the other end closed. The outer side of the open end of the lower end cap (52) is fixedly connected to the second connecting flange (53). The second connecting flange (53) is used for a detachable and sealed connection with the refrigerant output pipe.

2. The lithium hexafluorophosphate crystallization device according to claim 1, which does not require disassembly of refrigerant pipes, is characterized in that: The outer wall of the second cylinder (2) is fixedly connected with a plurality of support legs (7), which are arranged in a rectangular array along the circumference of the second cylinder (2). A shock-absorbing fixing component (8) is fixedly connected to the outer side of the support leg (7) away from the second cylinder (2).

3. A lithium hexafluorophosphate crystallization device without disassembling refrigerant pipes according to claim 2, characterized in that: The shock absorption and fixing assembly (8) includes a spring damping shock absorber (81), a base plate (82) and a connecting ring (83). One end of the spring damping shock absorber (81) is fixedly connected to the outside of the support leg (7), and the other end is fixedly connected to the outside of the base plate (82). The connecting ring (83) is fixedly connected to the outside of the base plate (82).

4. A lithium hexafluorophosphate crystallization device without disassembling refrigerant pipes according to claim 1, characterized in that: It also includes a pressure relief assembly (9), which includes a pressure relief pipe (91), a solenoid valve (92) and a pressure sensor (93). One end of the pressure relief pipe (91) is connected to the inside of the first cylinder (1). The solenoid valve (92) is fixedly connected to the inside of the pressure relief pipe (91). The pressure sensor (93) is fixedly installed inside the pressure relief pipe (91) and located on the side of the solenoid valve (92) close to the first cylinder (1). The pressure sensor (93) is signal connected to the solenoid valve (92).

5. A lithium hexafluorophosphate crystallization device without disassembling refrigerant pipes according to claim 2 or 4, characterized in that: A support rod (10) is fixedly connected to the outside of the first cylinder (1), and a protective shell (11) is fixedly connected to the other end of the support rod (10). The air inlet assembly (4) and the air outlet assembly (5) are both located inside the protective shell (11).

6. A lithium hexafluorophosphate crystallization device without disassembling refrigerant pipes according to claim 1, characterized in that: Four first partition plates (12) are fixedly connected to the inner side of the first cylinder (1). The four first partition plates (12) extend along the axial direction of the first cylinder (1) and are evenly distributed along the circumference. A first air guide hole (13) is opened on the outer side of the first partition plate (12). The four first partition plates (12) divide the inner side of the first cylinder (1) into four independent connecting cavities. Along the circumference of the first cylinder (1), they are the first cavity, the second cavity, the third cavity and the fourth cavity. The U-shaped tube (41) is connected to the first cavity, and the through hole (6) is connected to the third cavity.

7. A lithium hexafluorophosphate crystallization device without disassembling refrigerant pipes according to claim 1, characterized in that: Two second partition plates (14) are fixedly connected to the inner side of the second cylinder (2). The two second partition plates (14) extend along the axial direction of the second cylinder (2) and are arranged opposite to each other. A second air guide hole (15) is opened on the outer side of the second partition plate (14). The two second partition plates (14) divide the inner side of the second cylinder (2) into two independent connecting cavities, namely the fifth cavity and the sixth cavity. The fifth cavity is connected to the through hole (6), and the sixth cavity is connected to the connecting pipe (51).

8. A lithium hexafluorophosphate crystallization device without disassembling refrigerant pipes according to claim 1, characterized in that: The cross-sectional diameter of the second cylinder (2) is smaller than that of the first cylinder (1), and a concentration sensor (16) is fixedly connected to the inner side of both the upper end cap (42) and the lower end cap (52).

Images