Evaporative crystallization apparatus

Abstract

This utility model discloses an evaporation crystallization device, relating to the field of evaporation crystallization technology. It includes a heating element, an evaporator, a circulating pump, and a circulating pipe. A connecting port and a fixed pipe are fixedly connected to the surface of the evaporator. A limiting pipe is movably sleeved inside the fixed pipe. A preheating pipe is fixedly connected to the front surface of the limiting pipe, and a connecting pipe is movably sleeved to the lower surface of the preheating pipe. The limiting pipe continuously moves until a set of limiting grooves on it corresponds to a set of limiting blocks. At this time, the set of limiting blocks are reset by the elastic force of a return spring and engage with the limiting pipe, thus completing the installation of the preheating pipe. When the preheating pipe malfunctions or requires regular maintenance, maintenance personnel can easily disassemble it for inspection, repair, or replacement, reducing maintenance time and labor costs. This helps to shorten the downtime of the device, improve production efficiency, and reduce the risk of production delays caused by equipment failure.

Description

Technical Field

[0001] This utility model relates to the field of evaporation crystallization technology, and in particular to an evaporation crystallization apparatus. Background Technology

[0002] Allopurinol, a key drug for treating gout, is widely used in the pharmaceutical field. In the preparation of its intermediate hemisulfate, evaporation and crystallization are crucial steps that directly affect product quality and production efficiency. In actual industrial production, evaporation and crystallization equipment typically includes the following core structures:

[0003] 1. Evaporator, as the main site for evaporation and crystallization, vaporizes the solvent in the material through heating;

[0004] 2. Separator, used to separate steam from concentrated materials and crystals;

[0005] 3. A circulating pump drives the material to circulate within the device, ensuring the continuous and stable heating and evaporation process;

[0006] 4. Preheating tube: preheats the material entering the evaporator to improve evaporation efficiency.

[0007] Currently, various types of evaporation crystallization devices exist on the market. Some companies use traditional multi-effect evaporation crystallization devices, which connect multiple evaporators in series and utilize the secondary steam generated in the previous effect as a heat source for the next effect, achieving energy savings. Other companies use MVR evaporation crystallization devices, which use a compressor to compress and heat the secondary steam for recycling, further reducing energy consumption. Some advanced evaporation crystallization devices are equipped with automated control systems that can monitor and adjust the device's operating parameters in real time.

[0008] However, the existing evaporation crystallization apparatus implementations still have the following problems: Regarding maintenance and replacement, many components are complexly designed and have fixed installation methods, especially critical components such as preheating tubes. Once a fault occurs or maintenance is required, disassembly and replacement are extremely difficult, often requiring specialized technicians to expend considerable time and effort, leading to prolonged downtime and severely impacting production progress and efficiency. In terms of flexibility and adaptability, existing apparatuses struggle to quickly respond to changes in material properties, process adjustments, or production scale during production. When material types change, or preheating temperature and time requirements differ, adjustments to structures such as preheating tubes cannot be easily made, necessitating large-scale modifications or even replacement of the entire apparatus, resulting in high costs. This application addresses these problems by proposing a solution: designing an evaporation crystallization apparatus with easily maintainable and replaceable components. This apparatus can significantly improve flexibility in adapting to different production needs while reducing maintenance difficulty and downtime, effectively enhancing production efficiency and economic benefits. Utility Model Content

[0009] To address the shortcomings of existing technologies, this utility model provides an evaporation crystallization device that solves the problem that many devices have complex component designs and fixed installation methods. In particular, key components such as preheating pipes are extremely difficult to disassemble and replace once they malfunction or require maintenance. This often requires professional technicians to spend a lot of time and energy, resulting in long-term downtime of the device and seriously affecting production progress and efficiency.

[0010] To achieve the above objectives, this utility model provides the following technical solution:

[0011] An evaporation crystallization apparatus includes a heating element, an evaporator, a circulating pump, and a circulating pipe. The evaporator surface is fixedly connected to a connecting port and a fixed pipe. A limiting pipe is movably sleeved inside the fixed pipe. A preheating pipe is fixedly connected to the front surface of the limiting pipe. A connecting pipe is movably sleeved to the lower surface of the preheating pipe. A threaded ring is threaded onto the annular side of the connecting pipe. A connecting ring is fixedly connected to the annular side of the fixed pipe. A set of limiting blocks is movably engaged inside the connecting ring. A return spring is fixedly connected to the opposite sides of each of the limiting blocks. A fixing member is fixedly connected to the annular side of the connecting port, and the fixing member is movably sleeved with the connecting pipe.

[0012] Preferably, the threaded ring is threadedly connected to the lower end of the preheating pipe, the inner wall of the connecting ring is provided with a set of rectangular grooves, the set of rectangular grooves are respectively engaged with a set of limiting blocks, and the set of reset springs are respectively fixedly connected to the set of rectangular grooves.

[0013] Preferably, the limiting tube has a set of limiting grooves on its annular side, and the set of limiting grooves are respectively movably engaged with a set of limiting blocks. The inner wall of the fixing tube is fixedly connected to two slots, and the limiting tube has two positioning grooves on its annular side, and the two positioning grooves are respectively movably connected to the two slots.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The continuous movement of the limiting tube causes a set of limiting grooves on it to correspond with a set of limiting blocks. At this time, the set of limiting blocks are reset by the elastic force of the return spring and engage with the limiting tube, thus completing the installation of the preheating tube. When the preheating tube malfunctions or requires regular maintenance, maintenance personnel can easily disassemble it for inspection, repair or replacement, reducing maintenance time and labor costs. This helps to shorten the downtime of the equipment, improve production efficiency and reduce the risk of production delays caused by equipment failure.

[0016] 2. Rotate the threaded ring downwards to disengage it from the preheating tube, opening the limit switch. At this point, the connecting tube can be moved up and down for adjustment. Adjust its length as needed. After adjustment, rotate the threaded ring upwards to reset it. In actual production, changes in raw materials, adjustments to production scale, or process improvements may occur. The adjustable length design of the preheating tube makes the evaporation crystallization device more adaptable to these changes without requiring large-scale modifications or replacement of parts, thus improving the flexibility and versatility of the device. Attached Figure Description

[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0018] Figure 1 This is an overall structural diagram of the present invention;

[0019] Figure 2 This is a structural diagram of the evaporator of this utility model;

[0020] Figure 3 This is a structural diagram of the preheating pipe of this utility model;

[0021] Figure 4 This is a structural diagram of the limiting tube of this utility model.

[0022] Legend: 1. Heating element; 2. Evaporator; 3. Circulating pump; 4. Circulating pipe; 5. Preheating pipe; 6. Connection port; 7. Fixing pipe; 8. Connecting ring; 9. Limiting pipe; 10. Threaded ring; 11. Connecting pipe; 12. Fixing component; 13. Slot; 14. Limiting groove; 15. Positioning groove; 16. Limiting block; 17. Return spring; 18. Rectangular groove. Detailed Implementation

[0023] This application provides an evaporation crystallization device that effectively solves the problem of many devices having complex component designs and fixed installation methods, especially key components such as preheating pipes. Once a fault occurs or maintenance is required, disassembly and replacement are extremely difficult, often requiring professional technicians to spend a lot of time and energy, resulting in long-term downtime and seriously affecting production progress and efficiency. The evaporation crystallization device is designed with components that are easy to maintain and replace. This device can reduce maintenance difficulty and shorten downtime while greatly improving its flexibility to adapt to different production needs, effectively improving production efficiency and economic benefits.

[0024] Example

[0025] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the technical solution in this application effectively solves the problem that many devices have complex component designs and fixed installation methods, especially key components such as preheating pipes. Once a fault occurs or maintenance is required, disassembly and replacement are extremely difficult, often requiring professional technicians to spend a lot of time and energy, resulting in long-term downtime of the device and seriously affecting production progress and efficiency. The overall idea is as follows:

[0026] To address the problems existing in the prior art, this utility model provides an evaporation crystallization device, including a heating element 1, an evaporator 2, a circulating pump 3, and a circulating pipe 4. A connecting port 6 and a fixed pipe 7 are fixedly connected to the surface of the evaporator 2. A limiting pipe 9 is movably sleeved inside the fixed pipe 7. A preheating pipe 5 is fixedly connected to the front surface of the limiting pipe 9. A connecting pipe 11 is movably sleeved on the lower surface of the preheating pipe 5. A threaded ring 10 is threaded onto the annular side of the connecting pipe 11. A connecting ring 8 is fixedly connected to the annular side of the fixed pipe 7. A set of limiting blocks 16 are movably engaged inside the connecting ring 8, with the set of limiting blocks 16 facing opposite directions. A return spring 17 is fixedly connected to each surface. A fixing element 12 is fixedly connected to the annular side of the connection port 6. The fixing element 12 is movably sleeved with the connecting pipe 11. The material is sent into the evaporator 2 by the circulating pump 3 and circulates in the heating body 1. The high-temperature and high-pressure secondary steam output by the compressor releases heat outside the pipe. The material heats up to the boiling point and vaporizes, forming a vapor-liquid mixture. The mixture enters the separation chamber at the top of the evaporator 2. Due to the increased space, the flow rate decreases. Under the action of gravity and centrifugal force, the steam separates from the concentrated material. The steam enters the compressor, and the concentrated material returns to the bottom of the evaporator 2 to continue circulating. During the evaporation process, the solvent... As the concentration of solute decreases, it rises to supersaturation, crystallizing at the seed crystal or the vessel wall. The crystals grow with the material circulation and, after reaching a certain particle size, are discharged from the discharge port to obtain the product. During the heating process in the heating chamber of evaporator 2, some steam is transferred to the evaporation chamber of evaporator 2 through the preheating pipe 5 and the connecting pipe 11 to preheat it and reduce heat loss. During installation, the preheating pipe 5 is movably connected to the fixed pipe 7 through the fixed limiting pipe 9, and guided by two slots 13. During the connection process, a set of limiting blocks 16 are squeezed by the limiting pipe 9 and move in opposite directions. In the active state, a set of return springs 17 are compressed, and the limit tube 9 continues to move so that a set of limit grooves 14 opened on it corresponds to a set of limit blocks 16. At this time, the set of limit blocks 16 are reset by the elastic force of the return springs 17 and engage with the limit tube 9, thereby completing the installation of the preheating tube 5. When the preheating tube 5 malfunctions or requires regular maintenance, maintenance personnel can easily disassemble it for inspection, repair or replacement, reducing maintenance time and labor costs. This helps to shorten the downtime of the equipment, improve production efficiency and reduce the risk of production delays caused by equipment failure.

[0027] The threaded ring 10 is threadedly connected to the lower end of the preheating tube 5. A set of rectangular grooves 18 are opened on the inner wall of the connecting ring 8. The set of rectangular grooves 18 are respectively engaged with a set of limiting blocks 16. A set of return springs 17 are respectively fixedly connected to the set of rectangular grooves 18. A set of limiting grooves 14 are opened on the annular side of the limiting tube 9. The set of limiting grooves 14 are respectively engaged with a set of limiting blocks 16. Two slots 13 are fixedly connected to the inner wall of the fixed tube 7. Two positioning grooves 15 are opened on the annular side of the limiting tube 9. The two positioning grooves 15 are respectively engaged with the two slots 13. Rotating the threaded ring 10 downwards disengages it from the preheating tube 5, opening the limiting position. At this time, the connecting tube 11 can be moved up and down for adjustment. Its length can be adjusted according to the requirements. After adjustment, rotating the threaded ring 10 upwards resets it. In actual production, there may be changes in raw materials, adjustments in production scale, or process improvements. The adjustable length design of the preheating tube 5 makes the evaporation crystallization device more adaptable to these changes without the need for large-scale modification or replacement of parts of the entire device, thus improving the flexibility and versatility of the device.

[0028] Among them, heating element 1: provides heat to the material, allowing the material to circulate within it. The high-temperature and high-pressure secondary steam output by the compressor releases heat outside the tube, causing the material to heat up to the boiling point and vaporize. It is the basic heat source for the evaporation and crystallization of the material.

[0029] Evaporator 2: As the core site for evaporation and crystallization, the material circulates and vaporizes in it, forming a vapor-liquid mixture. The vapor is separated from the concentrated material in the separation chamber, and the crystals grow in it, finally yielding the crystalline product.

[0030] Circulation pump 3: Drives the material to circulate within the device, ensuring that the material continuously enters the evaporator 2, ensuring the stable operation of the heating and evaporation process, and maintaining the material circulation of the entire evaporation and crystallization device;

[0031] Circulation pipe 4: Connects various components and serves as a channel for the material to circulate between components such as heating element 1 and evaporator 2, ensuring the orderly transfer of materials within the device and working in conjunction with circulation pump 3 to achieve material circulation;

[0032] Preheating pipe 5: It transfers part of the steam generated in the heating chamber of evaporator 2 to the evaporation chamber to preheat the material, reduce heat loss, and is easy to install and has an adjustable length, which is conducive to maintenance and adapting to production changes.

[0033] Connection port 6: Located on the surface of evaporator 2, it is movably connected to connecting pipe 11 through fastener 12, and serves as a connecting component, providing an interface for material inlet and outlet or steam transmission, and ensuring the flow of materials within the device;

[0034] Fixed tube 7: The movable sleeve limiting tube 9 provides support and positioning for the installation of the preheating tube 5. The groove 13 on the inner wall can guide the limiting tube 9, making the installation of the preheating tube 5 more precise and ensuring the stability of the device structure.

[0035] Connecting ring 8: Fixed on the annular side of the fixed tube 7, with an internal movable locking limit block 16, which works in conjunction with the reset spring 17 to limit and fix the preheating tube 5 during installation, ensuring that the preheating tube 5 is installed firmly.

[0036] Limiting tube 9: It is fixed on the preheating tube 5 and movably connected to the fixing tube 7. It cooperates with the limiting block 16 through the limiting groove 14 to realize the installation and fixing of the preheating tube 5, which facilitates its disassembly and maintenance.

[0037] Threaded ring 10: It is threaded onto the annular side of the connecting pipe 11 and threaded to the lower end of the preheating pipe 5. Rotating it can limit or unlock the connecting pipe 11, thereby adjusting the length of the preheating pipe 5 to meet different production needs.

[0038] Connecting pipe 11: It is movably sleeved on the lower surface of the preheating pipe 5. Through the connection with the connecting port 6, it transmits steam or materials. Its length can be changed by adjusting the threaded ring 10 to meet the process adjustment of the device.

[0039] Fixing component 12: It is fixed on the annular side of the connection port 6 and is movably connected to the connecting pipe 11. It plays a role in fixing and positioning the connecting pipe 11, ensuring a stable connection between the connecting pipe 11 and the connection port 6, and ensuring smooth material or steam transmission.

[0040] Slot 13: Fixed to the inner wall of the fixed tube 7, and movably connected to the positioning slot 15 on the limiting tube 9. It guides the limiting tube 9 during the installation of the preheating tube 5 and assists the preheating tube 5 in being accurately installed in the fixed position.

[0041] Limiting groove 14: It is opened on the annular side of the limiting tube 9 and is movably engaged with the limiting block 16. When the limiting tube 9 moves into place, the limiting block 16 is engaged into the limiting groove 14, thus completing the installation and fixing of the preheating tube 5 and facilitating disassembly.

[0042] Positioning groove 15: It is formed on the annular side of the limiting tube 9 and is movably connected to the slot 13 on the inner wall of the fixed tube 7. It works together with the slot 13 to accurately limit the position of the limiting tube 9 and ensure the installation accuracy of the preheating tube 5.

[0043] Limiting block 16: It is movable and snapped into the connecting ring 8. Under the action of the return spring 17, it cooperates with the limiting groove 14 on the limiting tube 9 to realize the installation and fixation of the preheating tube 5 and prevent it from loosening.

[0044] Reset spring 17: One end is fixed in the rectangular groove 18 inside the connecting ring 8, and the other end is connected to the limiting block 16. When the preheating pipe 5 is installed, it provides a reset spring force to the limiting block 16 so that it can be locked and fixed with the limiting groove 14.

[0045] Rectangular groove 18: It is formed on the inner wall of the connecting ring 8 to fix the reset spring 17, provide an installation position for the reset spring 17, enable the reset spring 17 to function stably, and ensure the normal operation of the limit block 16.

[0046] Working principle:

[0047] The material is fed into the evaporator 2 by the circulating pump 3 and circulates within the heating element 1. The high-temperature, high-pressure secondary steam output from the compressor releases heat outside the tubes, causing the material to heat up to its boiling point and vaporize, forming a vapor-liquid mixture. This mixture enters the separation chamber at the top of the evaporator 2. Due to the increased space, the flow rate decreases, and under the action of gravity and centrifugal force, the steam separates from the concentrated material. The steam enters the compressor, while the concentrated material returns to the bottom of the evaporator 2 to continue circulating. During the evaporation process, the solvent continuously decreases, and the solute concentration rises to supersaturation, crystallizing at the seed crystals or on the vessel wall. The crystals grow as the material circulates. After reaching a certain particle size, the product is discharged from the discharge port. During the heating process in the heating chamber of evaporator 2, some steam is transferred to the evaporation chamber of evaporator 2 through preheating pipe 5 and connecting pipe 11 to preheat it and reduce heat loss. During installation, preheating pipe 5 is movably connected to fixed pipe 7 through fixed limiting pipe 9, and guided by two slots 13. During the connection process, a set of limiting blocks 16 are squeezed by limiting pipe 9 and move in opposite directions, compressing a set of return springs 17. The continuous movement causes a set of limiting grooves 14 to align with a set of limiting blocks 16. At this time, the set of limiting blocks 16 are reset by the spring force of the reset spring 17 and engage with the limiting tube 9, thus completing the installation of the preheating tube 5. When the preheating tube 5 malfunctions or requires regular maintenance, maintenance personnel can easily disassemble it for inspection, repair, or replacement, reducing maintenance time and labor costs. This helps to shorten the downtime of the device, improve production efficiency, and reduce the risk of production delays caused by equipment failure. Rotating the threaded ring 10 downwards disengages it from the sleeve of the preheating tube 5, opening the limit. At this time, the connecting tube 11 can be moved up and down for adjustment. Its length can be adjusted according to needs. After adjustment, rotating the threaded ring 10 upwards resets it. In actual production, there may be changes in raw materials, adjustments in production scale, or process improvements. The adjustable length design of the preheating tube 5 makes it easier for the evaporation crystallization device to adapt to these changes without the need for large-scale modification or replacement of parts of the entire device, thus improving the flexibility and versatility of the device.

[0048] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An evaporative crystallization apparatus comprising a heating body (1), an evaporator (2), a circulation pump (3) and a circulation pipe (4); characterized in that, The evaporator (2) has a connection port (6) and a fixed tube (7) fixedly connected to its surface. A limiting tube (9) is movably sleeved inside the fixed tube (7). A preheating tube (5) is fixedly connected to the front surface of the limiting tube (9). A connection tube (11) is movably sleeved on the lower surface of the preheating tube (5). The connecting pipe (11) has a threaded ring (10) threaded on its annular side, and the fixing pipe (7) has a connecting ring (8) fixedly connected on its annular side. A set of limiting blocks (16) is movably engaged inside the connecting ring (8), and a set of limiting blocks (16) is fixedly connected to the back side of each set of limiting blocks (16) with a return spring (17).

2. An evaporative crystallization apparatus as claimed in claim 1, characterized in that: The connecting port (6) is fixedly connected to a fastener (12) on its annular side; The fastener (12) is movably connected to the connecting pipe (11).

3. An evaporative crystallization apparatus as claimed in claim 1, characterized in that: The threaded ring (10) is threadedly connected to the lower end of the preheating pipe (5).

4. An evaporative crystallization apparatus as claimed in claim 1, characterized in that: The inner wall of the connecting ring (8) is provided with a set of rectangular grooves (18); Among them, a set of rectangular grooves (18) are movably engaged with a set of limiting blocks (16), and a set of reset springs (17) are fixedly connected to a set of rectangular grooves (18).

5. An evaporative crystallization apparatus as defined in claim 1, wherein: The limiting tube (9) has a set of limiting grooves (14) on its annular side; Among them, a set of limiting grooves (14) are respectively engaged with a set of limiting blocks (16).

6. An evaporative crystallization apparatus as claimed in claim 1, characterized in that: The inner wall of the fixed tube (7) is fixedly connected with two slots (13), and the side of the limiting tube (9) has two positioning slots (15). The two positioning slots (15) are movably connected to the two card slots (13) respectively.

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