A crystallization apparatus that enables uninterrupted cooling

Abstract

The present application relates to chemical crystallization equipment technical field, provide a kind of crystallization equipment that can realize uninterrupted cooling, including crystallizer main cylinder, its inside is shaped with crystal analysis cavity, and the interlayer space is arranged between outer wall and inner wall;Cylinder two sides are fixed with first, second hollow main shaft, inner cavity is all communicated with interlayer space;Two hollow main shaft outer ends are respectively rotationally connected with first, second rotary joints.Cold liquid inlet and outlet are connected by rotary joint, hollow main shaft and interlayer space, and there is cooling circulation loop that is continuously conducted in the process of equipment rotation overturning.The present application fundamentally solves the pain point that cooling is interrupted due to cooling pipeline must be disassembled when crystallization kettle overturns and discharges, ensures the stability of process temperature, improves product quality and clears the obstacle for full-process automation.

Description

Technical Field

[0001] This invention relates to the field of chemical crystallization equipment technology, specifically to a crystallization device capable of uninterrupted cooling. Background Technology

[0002] In the production of fine chemicals and new energy materials, crystallization is a key process for obtaining high-purity products. Existing crystallization equipment typically includes a jacketed crystallization tank, which is cooled and crystallized by continuously circulating a cooling medium into the jacket. To achieve separation of crystals from the mother liquor and complete discharge, the crystallization tank is usually equipped with supporting shafts on both sides, so as to drive the entire equipment cylinder to flip or invert after crystallization.

[0003] However, existing rotary crystallizers present a significant structural conflict in actual operation: the coolant inlet and outlet pipes of the jacket are typically directly fixed to the outer wall or head of the cylinder. When the equipment needs to rotate the cylinder to discharge material, these external pipes that move with the cylinder will inevitably cause mechanical interference with the equipment foundation or frame.

[0004] To avoid pipe interference and breakage, operators must disconnect the cooling system and manually disassemble the coolant inlet and outlet pipes before rotating the equipment to discharge material, only to reconnect them after discharge is complete. This forced and frequent disassembly and reassembly has a series of direct adverse consequences. First, the cooling process is interrupted, and the equipment lacks cooling replenishment during discharge, which can easily affect the crystal quality of heat-sensitive materials or cause some crystals to re-dissolve. Second, manual disassembly and reassembly inevitably introduces external air and moisture into the cooling circuit, easily creating air resistance within the pipes, thus reducing the heat exchange efficiency of subsequent batches and even accelerating the corrosion of the internal cooling channels. Furthermore, long-term, frequent disassembly and reassembly can easily cause physical wear on pipe joints and sealing components, increasing the risk of coolant leakage. This highly manual, intermittent operation also hinders the process from achieving continuous automation.

[0005] In summary, the present invention provides a crystallization apparatus capable of uninterrupted cooling to solve the above-mentioned problems. Summary of the Invention

[0006] This invention provides a crystallization device that can achieve uninterrupted cooling by constructing an internal cooling fluid circuit coaxial with the device's rotation axis. This solves the technical problems in the prior art where external pipes must be removed when the device rotates to discharge material, resulting in cooling interruption, process loss of control, and inability to automate the process.

[0007] The specific technical solution of this invention is as follows:

[0008] A crystallization device capable of uninterrupted cooling includes a crystallizer main cylinder, wherein a crystallization cavity is formed inside the crystallizer main cylinder, and an interlayer space is provided between the outer wall and the inner wall of the crystallizer main cylinder.

[0009] A first hollow main shaft and a second hollow main shaft are fixedly connected to opposite sides of the main body of the crystallizer, and the inner cavities of the first hollow main shaft and the second hollow main shaft are respectively connected to the interlayer space.

[0010] A first rotary joint and a second rotary joint are rotatably connected to the outer end of the first hollow spindle, and the second rotary joint is rotatably connected to the outer end of the second hollow spindle.

[0011] The second rotary joint is connected to a coolant inlet, and the first rotary joint is connected to a coolant outlet. The coolant inlet and the coolant outlet are connected to form a cooling circulation loop that is continuously conducted during the rotation of the crystallizer main body through the second rotary joint, the inner cavity of the second hollow main shaft, the interlayer space, the inner cavity of the first hollow main shaft, and the first rotary joint.

[0012] As an improvement of the present invention, a feed extension tube is coaxially inserted inside the first hollow spindle, the outer end of the feed extension tube is connected to a feed port, and the inner end of the feed extension tube passes through the first hollow spindle and extends to the geometric center of the crystallization cavity.

[0013] As an improvement of the present invention, an annular flow channel is formed between the outer wall of the feed extension tube and the inner wall of the first hollow main shaft, and a fluid channel connecting the coolant outlet and the annular flow channel is provided inside the first rotary joint.

[0014] As an improvement of the present invention, a nitrogen port is also provided on the first rotary joint, and a gas phase channel connecting the nitrogen port and the crystallization chamber is opened inside the first rotary joint and the first hollow main shaft.

[0015] As an improvement of the present invention, a dynamic and static sealing assembly is provided between the first hollow spindle and the feed extension tube, the dynamic and static sealing assembly being configured to isolate the material flow channel in the feed extension tube from the coolant flow channel in the annular gap flow channel.

[0016] As an improvement of the present invention, a first bearing seat and a second bearing seat are respectively rotatably sleeved on the outer sides of the first hollow spindle and the second hollow spindle, and the first bearing seat and the second bearing seat are respectively fixedly installed on the support frame.

[0017] As an improvement of the present invention, a transmission wheel is fixedly sleeved on the second hollow main shaft, and a drive motor and a reducer are fixedly installed on the support frame. The output end of the drive motor is connected to the transmission wheel through the reducer, and is configured to provide rotational power to the crystallizer main cylinder.

[0018] As an improvement of the present invention, a crystallizer discharge valve is connected to the conical bottom end of the crystallizer main cylinder, a discharge hose is connected to the outlet end of the crystallizer discharge valve, and an inspection port is connected to the top end of the crystallizer main cylinder corresponding to the position of the crystallizer discharge valve.

[0019] In this invention, the first and second hollow main shafts not only serve as structural components supporting the rotation of the crystallizer's main cylinder, but their internal flow channels are also connected to the interlayer space via radial connecting holes and annular distribution cavities. Specifically, the end of the hollow main shaft is connected to the cylinder head flange. After entering the hollow main shaft, the cooling medium is guided to the inlet of the cylinder interlayer through radial diversion holes provided on the inner wall of the main shaft. This ensures that during the 360-degree rotation of the cylinder, the coolant, under the combined effect of gravity and pumping pressure, can be evenly spread within the interlayer space, avoiding the formation of localized heat exchange dead zones.

[0020] In this invention, the first hollow spindle employs a fluid isolation structure with a coaxial sleeve and independent shaft wall gas channels, which is the core for achieving uninterrupted cooling. Its center is a stationary feed extension pipe, surrounded by an annular coolant flow channel formed by the inner wall of the spindle and the outer wall of the feed extension pipe. Simultaneously, a gas phase channel is independently opened inside the solid side wall of the first hollow spindle. By setting stepped sealing steps inside the multi-channel rotary joint, combined with multiple sets of parallel mechanical seal dynamic and static rings, it is ensured that materials, nitrogen, and coolant do not cross-contaminate under different pressure gradients. In particular, the dynamic and static sealing components use cryogenic and corrosion-resistant flexible graphite or polytetrafluoroethylene composite materials to compensate for the slight axial movement generated during spindle rotation.

[0021] In this invention, the nitrogen inlet is formed by an annular groove on the stator of the first rotary joint corresponding to an oblique through hole on the rotor, thus creating a gas phase conversion logic. After passing through the first hollow main shaft, the gas phase channel's outlet is located near the maintenance port of the crystallization chamber and is equipped with a one-way valve structure to prevent backflow. This design ensures that during the tilting discharge stage, nitrogen can always act on the top of the liquid surface to form back pressure, preventing the mother liquor from flowing back into the gas phase pipeline due to the cylinder tilting, thereby ensuring the continuity and safety of the pressurized discharge process.

[0022] In this invention, the structural strength configuration of the support frame and bearing housing is matched with the rigidity of the hollow main shaft. Since the main shaft has a hollow flow channel and multiple functional pipes, its effective load-bearing cross-sectional area is relatively small. Therefore, the first and second hollow main shafts are integrally forged from high-strength alloy stainless steel. The first and second bearing housings use self-aligning roller bearings to absorb the alternating load caused by the shift in the material's center of gravity and the axial stress caused by thermal expansion and contraction during the full-load tumbling of the crystallizer, preventing seal failure at the rotary joint due to axial misalignment.

[0023] In this invention, the cantilevered mounting structure of the feed extension tube is rigidly fixed by the stator end of the first rotary joint, maintaining a constant radial clearance between it and the rotating first hollow main shaft. To prevent vibration of the feed extension tube in a long cantilevered state, a wear-resistant support ring is provided near the cylinder end of the inner cavity of the first hollow main shaft, and this support ring has sufficient liquid passage holes. This provides both centering support for the feed tube and does not hinder the circulation and return of coolant in the annular gap channel, thereby ensuring the stability of the internal structure during dynamic crystallization.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. This invention cleverly integrates the inlet and outlet circuits of the cooling medium onto the rotation centerline of the equipment, ensuring that the external static piping and the internally dynamically rotating crystallizing cylinder do not interfere with each other. This fundamentally eliminates the drawback of cooling interruptions due to material discharge, effectively maintaining the stability of the crystallization process temperature and greatly improving the quality and yield of crystal products from sensitive chemicals.

[0026] 2. This invention utilizes a tube-in-tube design with a coaxial feed extension tube within the first hollow main shaft, coupled with dynamic and static sealing components, to achieve independent operation of the feed channel, cooling annular gap channel, and gas phase pressurization channel within a very small space. This eliminates the need for disassembling and reconnecting all external pipes, achieving a fully sealed system and providing core equipment support for fully automated production from crystallization to discharge. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0028] Figure 2 This is a schematic diagram of the crystallizer feed valve of the present invention.

[0029] Figure 3 This is a schematic diagram of the first rotary joint of the present invention.

[0030] Figure 4 This is a schematic diagram of the second rotary joint of the present invention.

[0031] The attached diagram is labeled as follows: 1. Feed inlet; 2. Nitrogen inlet; 3. Coolant outlet; 4. Junction box; 5. Crystallizer discharge valve; 6. Discharge hose; 7. Coolant inlet; 8. Crystallizer main body; 9. Reducer; 10. Drive motor; 11. Support frame; 12. Inspection port; 13. First hollow main shaft; 14. First bearing seat; 15. Feed extension pipe; 16. First rotary joint; 17. Second rotary joint; 18. Transmission wheel; 19. Second hollow main shaft; 20. Second bearing seat; 21. Crystallization chamber; 22. Interlayer space. Detailed Implementation

[0032] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0033] like Figures 1-4 As shown, the present invention provides a crystallization device that can achieve uninterrupted cooling, including a crystallizer main cylinder 8, a crystallization chamber 21 formed inside the crystallizer main cylinder 8, and an interlayer space 22 provided between the outer wall and the inner wall of the crystallizer main cylinder 8.

[0034] The first hollow main shaft 13 and the second hollow main shaft 19 are fixedly connected to opposite sides of the main cylinder 8 of the crystallizer, and the inner cavity of the first hollow main shaft 13 and the inner cavity of the second hollow main shaft 19 are respectively connected to the interlayer space 22.

[0035] The first rotary joint 16 and the second rotary joint 17 are rotatably connected to the outer end of the first hollow main shaft 13 and the second rotary joint 17 is rotatably connected to the outer end of the second hollow main shaft 19.

[0036] The second rotary joint 17 is connected to a coolant inlet 7, and the first rotary joint 16 is connected to a coolant outlet 3. The coolant inlet 7 and the coolant outlet 3 are connected to each other through the second rotary joint 17, the inner cavity of the second hollow main shaft 19, the interlayer space 22, the inner cavity of the first hollow main shaft 13, and the first rotary joint 16 to form a cooling circulation loop that is continuously connected during the rotation of the crystallizer main cylinder 8.

[0037] The first hollow main shaft 13 is coaxially provided with a feed extension tube 15. The outer end of the feed extension tube 15 is connected to a feed port 1. The inner end of the feed extension tube 15 passes through the first hollow main shaft 13 and extends to the geometric center of the crystallization chamber 21.

[0038] An annular flow channel is formed between the outer wall of the feed extension tube 15 and the inner wall of the first hollow main shaft 13, and a fluid channel connecting the coolant outlet 3 and the annular flow channel is opened inside the first rotary joint 16.

[0039] The first rotary joint 16 is also connected to a nitrogen port 2, and the interior of the first rotary joint 16 and the first hollow main shaft 13 is provided with a gas phase channel connecting the nitrogen port 2 and the crystallization chamber 21.

[0040] A dynamic and static sealing assembly is provided between the first hollow spindle 13 and the feed extension tube 15. The dynamic and static sealing assembly is configured to isolate the material flow channel in the feed extension tube 15 from the coolant flow channel in the annular gap flow channel.

[0041] The outer sides of the first hollow spindle 13 and the second hollow spindle 19 are respectively rotatably fitted with a first bearing seat 14 and a second bearing seat 20, and the first bearing seat 14 and the second bearing seat 20 are respectively fixedly installed on the support frame 11.

[0042] A transmission wheel 18 is fixedly sleeved on the second hollow main shaft 19, and a drive motor 10 and a reducer 9 are fixedly installed on the support frame 11. The output end of the drive motor 10 is connected to the transmission wheel 18 through the reducer 9, and is configured to provide rotational power to the crystallizer main cylinder 8.

[0043] A crystallizer discharge valve 5 is connected to the cone bottom end of the crystallizer main cylinder 8. A discharge hose 6 is connected to the outlet end of the crystallizer discharge valve 5. An inspection port 12 is connected to the top of the crystallizer main cylinder 8 corresponding to the position of the crystallizer discharge valve 5.

[0044] The working principle of this invention is as follows: In the initial state, the equipment maintains a vertical and stationary state with the crystallizer discharge valve 5 facing downwards, and the crystallizer discharge valve 5 is in a closed and locked state. External liquid material is pumped in through the feed port 1 at the outer end of the first rotary joint 16, and is directly transported to the geometric center region of the crystallization chamber 21 along the stationary feed extension pipe 15. This design effectively avoids material flowing along the wall or splashing. At the same time as or before feeding, the cooling system is turned on: external coolant is introduced from the coolant inlet 7, passes through the stationary second rotary joint 17 shell and the rotating second hollow main shaft 19 inner cavity in sequence, and is injected into the interlayer space 22 for large-area heat exchange; the coolant after absorbing heat gathers in the annular flow channel formed by the inner wall of the first hollow main shaft 13 and the outer wall of the feed extension pipe 15, and is finally discharged from the coolant outlet 3 through the fluid channel of the first rotary joint 16, thereby forming a stable and closed initial cooling cycle loop.

[0045] After feeding stops at inlet 1, the control system starts the drive motor 10. The power is amplified by the reducer 9 and transmitted to the transmission wheel 18, driving the crystallizer main cylinder 8, along with the first hollow main shaft 13 and the second hollow main shaft 19, to slowly tumble 360 ​​degrees at a set speed. As the cylinder tumbles, creating a complex three-dimensional vortex of material mixing, all externally connected rigid pipes remain stationary thanks to the dynamic-static isolation provided by the first rotary joint 16 and the second rotary joint 17. During this dynamic process, the coolant continuously undergoes forced convection circulation within the interlayer space 22 through the coaxial conductive structure between the main shaft cavity and the rotary joint, achieving continuous cooling without blind spots while the material is uniformly mixed, ensuring the uniformity and stability of the internal crystallization temperature field.

[0046] After reaching the crystallization endpoint specified in the process, the drive motor 10 brakes, precisely stopping the main cylinder 8 of the crystallizer and repositioning it to a vertically downward discharge position with the crystallizer discharge valve 5. The operator or robotic arm connects and locks the discharge hose 6 to the crystallizer discharge valve 5, then opens the valve. At this time, external high-pressure nitrogen enters from the stationary nitrogen port 2, passes through the gas phase channel inside the first rotary joint 16 and the first hollow main shaft 13, and enters the top of the liquid surface in the crystallization chamber 21. Under continuous and stable gas phase back pressure, the solid-liquid mixed crystallization slurry is quickly and thoroughly forced out from the bottom to the downstream collection equipment. Throughout this entire pressurized discharge cycle, the aforementioned cooling circulation loop remains unobstructed and operates independently, completely eliminating the risk of crystal re-dissolution due to interruption of cooling during discharge, achieving true full-cycle uninterrupted cooling and closed-loop discharge.

[0047] The embodiments of the present invention are given for the purposes of illustration and description. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A crystallization device capable of uninterrupted cooling, characterized in that, The crystallizer includes a main cylinder (8), the crystallizer main cylinder (8) has a crystallization chamber (21) formed inside, and a sandwich space (22) is provided between the outer wall and the inner wall of the crystallizer main cylinder (8). The first hollow main shaft (13) and the second hollow main shaft (19) are fixedly connected to opposite sides of the main cylinder (8) of the crystallizer, and the inner cavity of the first hollow main shaft (13) and the inner cavity of the second hollow main shaft (19) are respectively connected to the interlayer space (22). The first rotary joint (16) and the second rotary joint (17) are rotatably connected to the outer end of the first hollow spindle (13) and the second rotary joint (17) is rotatably connected to the outer end of the second hollow spindle (19). The second rotary joint (17) is connected to a coolant inlet (7), and the first rotary joint (16) is connected to a coolant outlet (3). The coolant inlet (7) and the coolant outlet (3) are connected to each other through the second rotary joint (17), the inner cavity of the second hollow main shaft (19), the interlayer space (22), the inner cavity of the first hollow main shaft (13), and the first rotary joint (16) to form a cooling circulation loop that is continuously connected during the rotation of the crystallizer main cylinder (8).

2. The crystallization equipment capable of uninterrupted cooling according to claim 1, characterized in that, The first hollow spindle (13) is coaxially provided with a feed extension tube (15), the outer end of which is connected to a feed port (1), and the inner end of which passes through the first hollow spindle (13) and extends to the geometric center of the crystallization chamber (21).

3. The crystallization equipment capable of uninterrupted cooling according to claim 2, characterized in that, The outer wall of the feed extension pipe (15) and the inner wall of the first hollow main shaft (13) form an annular flow channel, and the interior of the first rotary joint (16) is provided with a fluid channel connecting the coolant outlet (3) and the annular flow channel.

4. The crystallization equipment capable of uninterrupted cooling according to claim 3, characterized in that, The first rotary joint (16) is also connected to a nitrogen port (2), and the first rotary joint (16) and the first hollow main shaft (13) have a gas phase channel connecting the nitrogen port (2) and the crystallization chamber (21).

5. The crystallization equipment capable of uninterrupted cooling according to claim 4, characterized in that, A dynamic and static sealing assembly is provided between the first hollow spindle (13) and the feed extension tube (15). The dynamic and static sealing assembly is configured to isolate the material flow channel in the feed extension tube (15) from the coolant flow channel in the annular gap flow channel.

6. The crystallization equipment capable of uninterrupted cooling according to claim 1, characterized in that, The first hollow spindle (13) and the second hollow spindle (19) are respectively rotatably fitted with a first bearing seat (14) and a second bearing seat (20), and the first bearing seat (14) and the second bearing seat (20) are respectively fixedly installed on the support frame (11).

7. The crystallization apparatus capable of uninterrupted cooling according to claim 6, characterized in that, A transmission wheel (18) is fixedly sleeved on the second hollow main shaft (19), and a drive motor (10) and a reducer (9) are fixedly installed on the support frame (11). The output end of the drive motor (10) is connected to the transmission wheel (18) through the reducer (9) and configured to provide rotational power to the crystallizer main cylinder (8).

8. The crystallization apparatus capable of uninterrupted cooling according to claim 1, characterized in that, The crystallizer main cylinder (8) is connected to a crystallizer discharge valve (5) at the conical bottom end. The outlet end of the crystallizer discharge valve (5) is connected to a discharge hose (6). The top end of the crystallizer main cylinder (8) is connected to an inspection port (12) corresponding to the position of the crystallizer discharge valve (5).

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