Fixed disc type crystallizer

Abstract

The utility model relates to the technical field of crystallizers, and particularly discloses a fixed disc type crystallizer, which comprises a tank body, a discharge port arranged on the bottom surface of the tank body, a feed port arranged on the top surface of the tank body, a plurality of cooling discs axially arranged in the tank body, a rotating shaft rotatably arranged in the middle of the plurality of cooling discs, and a plurality of scrapers radially arranged on the rotating shaft. The whole scraper is arranged in a concave shape, the outer side face of the scraper makes contact with the outer surface of the adjacent cooling disc, the rotating shaft and the scrapers are hollow, the upper end of the rotating shaft penetrates through the tank body and then is connected with a rotating connector, the outer wall of the upper end of the rotating shaft is connected with a rotating driving mechanism, and the rotating driving mechanism is arranged on the top face of the tank body. A water inlet pipe and a water outlet pipe of the cooling disc penetrate through the side wall of the tank body and extend. The rotating shaft and the scrapers are hollow and are matched with the rotating joint, so that a cooling medium can circulate in the rotating joint, and the cooling effect on the edges of the cooling discs and between the two adjacent cooling discs is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of crystallizer technology, and specifically discloses a fixed disc crystallizer. Background Technology

[0002] Fixed-disc crystallizers typically consist of one or more discs inside a tank, through which a cooling or heating medium is circulated. The feed liquid enters through the inlet of the fixed-disc crystallizer, distributes itself on the discs, and the cooling or heating medium circulates within the discs, causing the feed liquid to reach a supersaturated state within the crystallizer, thus crystallizing and precipitating crystals. The crystals gradually grow and accumulate, finally discharging from the outlet of the fixed-disc crystallizer. Fixed-disc crystallizers are widely used in the chemical, pharmaceutical, and food industries to produce various crystalline products.

[0003] The existing fixed-disc crystallizer has the following problems:

[0004] 1. The cooling effect is poor in the space between two adjacent cooling plates, and the scraper only serves to remove the crystals on the cooling plates;

[0005] 2. Crystals tend to adhere to the edges of the cooling tray, causing material to accumulate or form uneven layers, which affects the consistency and uniformity of crystal growth and is difficult to remove. Utility Model Content

[0006] In view of the shortcomings of the prior art, the present invention provides a fixed disc crystallizer to solve the problems of poor cooling effect in the space between two adjacent cooling discs in the prior art, the scraper only plays the role of scraping off the crystals on the cooling discs, the easy formation of wall-mounted crystals at the edge of the cooling discs, the accumulation of material at the edge or the formation of an uneven material layer, which affects the consistency and uniformity of crystal growth and is difficult to remove.

[0007] The technical solution adopted by this utility model to solve its technical problem is:

[0008] The fixed-disc crystallizer includes a tank body with a discharge port on the bottom and a feed port on the top. Several cooling discs are axially arranged inside the tank body, and a rotating shaft is rotatably mounted on the center of each cooling disc. Several scrapers are radially arranged on the rotating shaft, with the scrapers and cooling discs staggered. Each scraper is U-shaped, with its outer surface contacting the outer surface of an adjacent cooling disc. The rotating shaft and scrapers are hollow. The upper end of the rotating shaft passes through the tank body and is connected to a rotary joint. A rotary drive mechanism is connected to the outer wall of the upper end of the rotating shaft and is located on the top surface of the tank body. The water inlet and outlet pipes of the cooling discs extend through the side walls of the tank body. The U-shaped scrapers, with their outer surfaces in contact with the outer surfaces of adjacent cooling discs, provide better scraping effect. The hollow design of the rotating shaft and scrapers, combined with the rotary joint, allows the cooling medium to circulate within them, enhancing the cooling effect along the edges of the cooling discs and between adjacent cooling discs.

[0009] Preferably, the rotary drive mechanism includes a driven pulley fixedly mounted on the rotating shaft, positioned between the rotary joint and the top surface of the tank. The driven pulley is connected to a driving pulley via a synchronous belt. A motor is fixedly mounted on the top surface of the tank, and the driving pulley is mounted on the motor's output shaft. This combination of driven pulley, synchronous belt, and driving pulley allows the motor to drive the driving pulley, which in turn drives the driven pulley, thus rotating the shaft. The power transmission is stable and reliable, ensuring stable and continuous scraping of crystals from the cooling plate by the scraper. Positioning the driven pulley between the rotary joint and the top surface of the tank is a rational layout, making full use of space and not affecting the normal operation of the rotary joint or the flow of the cooling medium. Simultaneously, the motor's installation on the top surface of the tank results in a compact structure, facilitating installation and maintenance, ensuring efficient operation of the entire crystallizer, improving crystallization efficiency and crystal quality, and reducing the probability of equipment failure.

[0010] Preferably, the lower part of the tank is provided with a conical bottom, and the discharge port is located at the bottom of the conical bottom. A cross-shaped mounting rod is fixedly installed inside the tank, and the lower end of the rotating shaft is rotatably mounted on the cross-shaped mounting rod. A bottom scraper is installed at the lower part of the rotating shaft in conjunction with the conical bottom. The conical bottom of the tank allows the crystallized material to naturally converge to the bottom under the action of gravity, facilitating centralized discharge and effectively avoiding material residue. The discharge port is located at the bottom of the conical bottom, further ensuring smooth discharge. The cross-shaped mounting rod provides stable support for the lower part of the rotating shaft, ensuring smooth rotation of the shaft, which in turn ensures stable operation of components such as the scraper. The bottom scraper, in conjunction with the conical bottom, can promptly scrape off the crystals accumulated at the bottom of the conical bottom, preventing material from clumping at the bottom and blocking the discharge port, greatly improving discharge efficiency, maintaining continuous and stable operation of the crystallizer, and contributing to improving overall production efficiency and product quality.

[0011] Preferably, the cooling plate includes a hollow annular plate with a fan-shaped notch. Inlet and outlet pipes are respectively installed on the side walls of the fan-shaped notch, and several baffles are installed inside the annular plate. The fan-shaped notch facilitates the layout of the inlet and outlet pipes, ensuring stable flow of the cooling medium and precise temperature control. The placement of the inlet and outlet pipes on opposite sides of the fan-shaped notch creates a reasonable flow path for the cooling medium within the annular plate, further enhancing the cooling effect. The baffles inside the annular plate can change the flow direction of the cooling medium, ensuring sufficient flow and avoiding cooling dead zones. This ensures uniform cooling across the cooling plate, improving the consistency and uniformity of crystal growth, enhancing crystal product quality, and meeting the production needs of various industries such as chemical, pharmaceutical, and food processing.

[0012] Preferably, the baffles include several outer baffles and several inner baffles evenly arranged along the circumference. The outer baffles extend inward from the outer circumferential wall of the annular disk, and the inner baffles extend outward from the inner circumferential wall of the annular disk. This staggered distribution of the outer and inner baffles along the circumference significantly alters the flow path of the cooling medium within the annular disk's cavity. Guided by the inner and outer baffles, the cooling medium flows in a complex, meandering pattern, fully filling the entire cavity space and avoiding cooling dead zones. This ensures that all parts of the cooling disk receive sufficient and uniform cooling, improving cooling efficiency and making the liquid material more evenly heated during crystallization. This contributes to producing crystal products with higher crystallinity and more stable quality, further enhancing the practicality of fixed-disc crystallizers in various industries.

[0013] Preferably, the baffles further include several partitions, which are disposed between adjacent inner and outer baffles, and several connecting pipes connect the two side walls of the fan-shaped notch. The partitions within the cooling pan, positioned between adjacent inner and outer baffles, further refine the flow path of the cooling medium, promoting more thorough contact with the inner wall of the annular pan, enhancing heat exchange efficiency, and resulting in more uniform and efficient cooling. The connecting pipes connecting the two side walls of the fan-shaped notch optimize the flow of the cooling medium at the notch, ensuring uniform distribution of the cooling medium during entry and exit, avoiding localized temperature differences, and guaranteeing overall temperature consistency of the cooling pan.

[0014] Preferably, the outer edges of both the top and bottom surfaces of the annular disk are chamfered, and side scrapers are installed on the top and bottom surfaces of the scraper near the edges to complement the chamfered edges. The chamfered edges on the outer edges of the top and bottom surfaces of the annular disk greatly improve the flow characteristics of the material on the cooling disk, effectively preventing material accumulation at the edges and guiding the material to spread evenly, creating favorable conditions for uniform crystal growth. In conjunction with this, the side scrapers installed on the top and bottom surfaces of the scraper near the edges can scrape off any crystals that may remain at the chamfered edges of the cooling disk, preventing adhering crystals from affecting the crystallization process. The chamfered edges and side scrapers not only improve the crystallization quality of the cooling disk but also ensure that the scraper scrapes crystals from the main disk surface while also addressing the edge areas, further improving overall discharge efficiency, maintaining stable operation over a long period, and effectively guaranteeing a dual improvement in product quality and production efficiency.

[0015] Preferably, the top and bottom surfaces of the scraper are provided with grooves near the edges to match the side scraper. One end of the side scraper is hinged to the groove via a hinge shaft, and a torsion spring is sleeved on the hinge shaft. One end of the torsion spring abuts against the bottom surface of the groove, and the other end abuts against the bottom surface of the side scraper. The fact that one end of the torsion spring abuts against the bottom surface of the groove, and the other end abuts against the bottom surface of the side scraper, ensures that the side scraper is always subjected to a force pressing against the edge of the cooling plate. This means that the side scraper can adapt to subtle changes in the edge of the cooling plate, and even during long-term operation, it can closely fit the chamfered edge, more efficiently scraping away the crystals adhering to the edge of the cooling plate. This adjustable elastic connection not only enhances the effect of the side scraper in removing crystals but also allows for compression when the side scraper reaches the inlet and outlet pipes, avoiding interference and ensuring the normal rotation of the scraper.

[0016] Preferably, limiting strips are fixedly installed on both the top and bottom surfaces of the scraper to cooperate with the side scraper. The limiting strips prevent the side scraper from rotating excessively under the force of the torsion spring, which could cause interference at the fan-shaped notch.

[0017] Preferably, both edges of the side scraper are chamfered to ensure smooth compression of the side scraper at the inlet and outlet pipes.

[0018] The beneficial effects of this utility model are:

[0019] 1. The scraper is U-shaped and its outer side contacts the outer surface of the adjacent cooling plate, resulting in better scraping effect; both the shaft and the scraper are hollow, and with the rotary joint, the cooling medium can flow through them, enhancing the cooling effect on the edge of the cooling plate and between two adjacent cooling plates.

[0020] 2. The chamfered edges on the outer edges of the top and bottom surfaces of the annular disk greatly improve the flow characteristics of materials on the cooling disk, effectively preventing material accumulation at the edges and guiding the material to spread evenly, creating favorable conditions for uniform crystal growth. In conjunction with this, side scrapers installed on the top and bottom surfaces of the scraper near the edges can remove any residual crystals at the chamfered edges of the cooling disk, preventing adhering crystals from affecting the crystallization process. The chamfered edges and side scrapers not only improve the crystallization quality of the cooling disk but also ensure that the scraper removes crystals from the main disk surface while also addressing the edge areas, further improving overall discharge efficiency, maintaining stable operation over a long period, and effectively guaranteeing a dual improvement in product quality and production efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a partial structural cross-sectional view of the present invention without the rotary joint and rotary drive mechanism;

[0023] Figure 3 This is a schematic diagram of the cooling plate of this utility model;

[0024] Figure 4 This is a cross-sectional view of the cooling plate of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the rotating shaft, scraper, and bottom scraper of this utility model;

[0026] Figure 6 for Figure 5 A magnified schematic diagram of the structure at point A in the middle.

[0027] In the diagram: 1. Tank body; 2. Cooling plate; 3. Shaft; 4. Scraper; 5. Rotary joint; 6. Driven pulley; 7. Synchronous belt; 8. Motor; 9. Cross-shaped mounting rod; 10. Bottom scraper;

[0028] 101. Discharge port; 102. Feed port; 201. Water inlet pipe; 202. Water outlet pipe; 203. Circular disc; 204. Fan-shaped notch; 205. Outer baffle; 206. Inner baffle; 207. Partition plate; 208. Connecting pipe; 209. Chamfered edge; 401. Side scraper; 402. Groove; 403. Hinge shaft; 404. Torsion spring; 405. Limiting strip. Detailed Implementation

[0029] The present invention will now be described and explained in detail with reference to the accompanying drawings.

[0030] Example 1

[0031] like Figure 1 and Figure 2As shown, the fixed disc crystallizer includes a tank 1, with a discharge port 101 on the bottom surface and a feed port 102 on the top surface. Several cooling discs 2 are arranged axially inside the tank 1, and a rotating shaft 3 is rotatably arranged in the middle of the cooling discs 2. Several scrapers 4 are arranged radially on the rotating shaft 3. The scrapers 4 and the cooling discs 2 are staggered. Each scraper 4 is U-shaped, and the outer surface of the scraper 4 contacts the outer surface of the adjacent cooling disc 2. The rotating shaft 3 and the scrapers 4 are hollow. The upper end of the rotating shaft 3 passes through the tank 1 and is connected to a rotary joint 5. A rotary drive mechanism is connected to the outer wall of the upper end of the rotating shaft 3. The rotary drive mechanism is located on the top surface of the tank 1. The water inlet pipe 201 and the water outlet pipe 202 of the cooling discs extend through the side wall of the tank 1.

[0032] The rotary drive mechanism includes a driven pulley 6 fixedly mounted on the rotating shaft 3, and the driven pulley 6 is located between the rotary joint 5 and the top surface of the tank 1. The driven pulley 6 is connected to the driving pulley via a synchronous belt 7. A motor 8 is fixedly mounted on the top surface of the tank 1, and the driving pulley is mounted on the output shaft of the motor 8.

[0033] The tank body 1 has a conical bottom at the bottom, and the discharge port 101 is located at the bottom of the conical bottom. A cross-shaped mounting rod 9 is fixedly installed inside the tank body 1. The lower end of the rotating shaft 3 is rotatably mounted on the cross-shaped mounting rod 9. A bottom scraper 10 is installed at the lower part of the rotating shaft 3 in conjunction with the conical bottom.

[0034] With the above configuration, when using this fixed disc crystallizer, the liquid material enters from the feed inlet 102 on the top surface of the tank 1 and is distributed on each cooling disc 2. The motor 8 starts and drives the driven pulley 6 to rotate through the drive pulley and the synchronous belt 7, causing the rotating shaft 3 to rotate, which in turn drives the scraper 4 to rotate. The water inlet pipe 201 and the water outlet pipe 202 of the cooling disc 2 are used to receive and discharge the cooling medium, respectively, to cool the cooling disc 2 and allow the liquid material to crystallize on the cooling disc 2. The outer side of the scraper 4 contacts the outer surface of the cooling disc 2, which can promptly scrape off the crystals on the cooling disc 2. At the same time, the rotating shaft 3 and the scraper 4 are hollow, allowing the cooling medium to flow through, further enhancing the cooling effect. At the bottom of the tank 1, the conical bottom causes the crystallized material to converge to the bottom and be discharged through the discharge outlet 101. The bottom scraper 10 can scrape off the crystals accumulated at the bottom of the cone to avoid blockage. This not only improves the crystallization efficiency and ensures that the cooling disc 2 works continuously and efficiently, but also ensures stable power transmission, compact structure, and easy installation and maintenance, effectively improving the overall production efficiency and product quality.

[0035] In other alternative embodiments, a gear transmission mechanism can be used to replace the rotary drive mechanism. In this embodiment, a driven gear is fixedly mounted on the rotating shaft, a motor is installed on the top surface of the tank, and a driving gear is mounted on the motor output shaft. The driving gear and the driven gear mesh with each other. When the motor is running, the driving gear drives the driven gear, thereby driving the rotating shaft to rotate.

[0036] like Figure 3 and Figure 4 As shown, the cooling plate 2 includes a hollow annular plate 203. A fan-shaped notch 204 is provided on the annular plate 203. A water inlet pipe 201 and a water outlet pipe 202 are respectively provided on the two side walls of the fan-shaped notch 204. Several baffles are provided in the inner cavity of the annular plate 203.

[0037] The baffles include a number of outer baffles 205 and a number of inner baffles 206 evenly arranged along the circumference. The outer baffles 205 extend inward from the outer peripheral wall of the annular disk 203, and the inner baffles 206 extend outward from the inner peripheral wall of the annular disk 203.

[0038] The baffles also include several partitions 207, which are disposed between adjacent inner baffles 206 and outer baffles 205. Several connecting pipes 208 are connected between the two side walls of the fan-shaped notch 204.

[0039] Through the above configuration, the cooling plate 2 adopts a hollow annular plate 203, which significantly increases the cooling area and lays the foundation for efficient cooling, enabling rapid crystallization of the liquid. The fan-shaped notch 204 cleverly provides a reasonable layout space for the inlet pipe 201 and the outlet pipe 202, ensuring stable entry and exit of the cooling medium, thereby precisely controlling the cooling temperature. In the inner cavity of the annular plate 203, outer baffles 205 and inner baffles 206 are evenly distributed along the circumference. The outer baffles 205 extend inward from the outer peripheral wall, and the inner baffles 206 extend outward from the inner peripheral wall. They cooperate with each other to greatly change the flow path of the cooling medium, allowing the cooling medium to flow fully in the inner cavity of the annular plate 203, avoiding the occurrence of cooling dead zones, and ensuring uniform cooling of all parts of the cooling plate 2. The partition 207, located between the adjacent inner baffle 206 and outer baffle 205, further refines the flow of the cooling medium, enhances heat exchange efficiency, and makes cooling more uniform and efficient. The connecting pipe 208, which connects the two side walls of the fan-shaped notch 204, optimizes the flow of the cooling medium at the fan-shaped notch 204, ensures uniform distribution of the cooling medium, avoids local temperature differences, and maintains the overall temperature consistency of the cooling plate 2. The cooling plate 2 not only effectively improves its own cooling performance, but also provides favorable conditions for high-quality crystallization. Combined with the function of the side scraper 401 closely adhering to the chamfered edge 209 of the cooling plate 2 to scrape off the crystals hanging on the wall, it together ensures the stable and efficient operation of the fixed plate crystallizer, and improves the crystallization quality and production efficiency.

[0040] like Figure 5 and Figure 6 As shown, chamfered edges 209 are provided on the outer edges of the top and bottom surfaces of the annular disk 203, and side scrapers 401 are provided on the top and bottom surfaces of the scraper 4 near the edges to match the chamfered edges 209.

[0041] The top and bottom surfaces of the scraper 4 are provided with grooves 402 near the edge to match the side scraper 401. One end of the side scraper 401 is hinged in the groove 402 by a hinge shaft 403. A torsion spring 404 is sleeved on the hinge shaft 403. One end of the torsion spring 404 abuts against the bottom surface of the groove 402, and the other end of the torsion spring 404 abuts against the bottom surface of the side scraper 401.

[0042] Limiting strips 405 are fixedly installed on both the top and bottom surfaces of the scraper 4 in conjunction with the side scraper 401.

[0043] Both sides of the side scraper 401 are chamfered.

[0044] With the above configuration, the chamfered edges 209 on the outer edges of the top and bottom surfaces of the hollow annular disk 203 of the cooling disk 2 can effectively guide the material to spread evenly, avoiding accumulation at the edges and creating favorable conditions for uniform crystal growth. The side scrapers 401 installed on the top and bottom surfaces of the scraper 4 near the edges fit tightly against the chamfered edges 209, efficiently scraping away crystals adhering to the edges of the cooling disk 2. The groove 402 on the scraper 4, in conjunction with the hinge shaft 403, enables the hinged installation of the side scrapers 401. The torsion spring 404 sleeved on the hinge shaft 403 abuts against the bottom surface of the groove 402 at one end and against the bottom surface of the side scraper 401 at the other end, providing the side scraper 401 with a continuous force pressing against the edge of the cooling disk 2. This allows it to adapt to subtle changes in the edge of the cooling plate 2, maintaining efficient crystal scraping even during long-term operation. The limiting strips 405 on the top and bottom surfaces of the scraper 4 precisely limit the rotation range of the side scraper 401, preventing it from rotating excessively under the action of the torsion spring 404 and avoiding interference at the fan-shaped notch 204. The chamfered edges of the side scraper 401 further optimize the crystal scraping effect and reduce scraping resistance. These structures, together with the hollow design of the cooling plate 2, the baffle layout, and the connecting pipe 208, comprehensively improve the performance of the fixed disc crystallizer, ensuring its stable and efficient operation in various industries and significantly improving the crystallization quality and production efficiency.

Claims

1. A fixed-disc crystallizer, comprising a tank (1), a discharge port (101) provided on the bottom surface of the tank (1), a feed port (102) provided on the top surface of the tank (1), a plurality of cooling discs (2) arranged axially inside the tank (1), a rotating shaft (3) rotatably arranged in the middle of the plurality of cooling discs (2), and a plurality of scrapers (4) arranged radially on the rotating shaft (3), characterized in that, Several scrapers (4) and several cooling plates (2) are staggered. Each scraper (4) is arranged in a U-shape. The outer side of the scraper (4) contacts the outer surface of the adjacent cooling plate (2). The rotating shaft (3) and several scrapers (4) are hollow. The upper end of the rotating shaft (3) passes through the tank (1) and is connected to a rotary joint (5). The upper outer wall of the rotating shaft (3) is connected to a rotary drive mechanism. The rotary drive mechanism is set on the top surface of the tank (1). The water inlet pipe (201) and water outlet pipe (202) of the cooling plate (2) both extend through the side wall of the tank (1).

2. The fixed-disc crystallizer according to claim 1, characterized in that, The rotary drive mechanism includes a driven pulley (6) fixedly mounted on the rotating shaft (3), and the driven pulley (6) is located between the rotary joint (5) and the top surface of the tank (1). The driven pulley (6) is connected to the driving pulley via a synchronous belt (7). A motor (8) is fixedly mounted on the top surface of the tank (1), and the driving pulley is mounted on the output shaft of the motor (8).

3. The fixed-disc crystallizer according to claim 2, characterized in that, The tank body (1) is provided with a conical bottom at the bottom, and the discharge port (101) is provided at the bottom of the conical bottom. A cross-shaped mounting rod (9) is fixedly provided inside the tank body (1). The lower end of the rotating shaft (3) is rotatably mounted on the cross-shaped mounting rod (9). The lower part of the rotating shaft (3) is equipped with a bottom scraper (10) in conjunction with the conical bottom.

4. The fixed-disc crystallizer according to claim 3, characterized in that, The cooling plate (2) includes a hollow annular plate (203), a fan-shaped notch (204) is provided on the annular plate (203), an inlet pipe (201) and an outlet pipe (202) are respectively provided on the side walls of the fan-shaped notch (204), and several baffles are provided in the inner cavity of the annular plate (203).

5. The fixed-disc crystallizer according to claim 4, characterized in that, The baffles include a number of outer baffles (205) and a number of inner baffles (206) evenly arranged along the circumference. The outer baffles (205) extend inward from the outer peripheral wall of the annular disk (203), and the inner baffles (206) extend outward from the inner peripheral wall of the annular disk (203).

6. The fixed-disc crystallizer according to claim 5, characterized in that, The baffles also include several partitions (207), which are arranged between adjacent inner baffles (206) and outer baffles (205), and several connecting pipes (208) are connected between the two side walls of the fan-shaped notch (204).

7. The fixed-disc crystallizer according to claim 6, characterized in that, The outer edges of the top and bottom surfaces of the circular disc (203) are provided with chamfered edges (209), and the scraper (4) is provided with side scrapers (401) near the edges of the top and bottom surfaces in conjunction with the chamfered edges (209).

8. The fixed-disc crystallizer according to claim 7, characterized in that, The top and bottom surfaces of the scraper (4) are provided with grooves (402) near the edge to match the side scraper (401). One end of the side scraper (401) is hinged in the groove (402) through a hinge shaft (403). A torsion spring (404) is sleeved on the hinge shaft (403). One end of the torsion spring (404) abuts against the bottom surface of the groove (402), and the other end of the torsion spring (404) abuts against the bottom surface of the side scraper (401).

9. The fixed-disc crystallizer according to claim 8, characterized in that, Limit strips (405) are fixedly installed on the top and bottom surfaces of the scraper (4) in conjunction with the side scraper (401).

10. The fixed-disc crystallizer according to claim 9, characterized in that, The side scraper (401) has chamfers on both sides.

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