A crystallization device for N-vinyl pyrrolidone

Abstract

The invention discloses a crystallization device for N-vinyl pyrrolidone, and the invention relates to the technical field of crystallization devices. In the process of evaporation and crystallization, it is necessary to heat and evaporate the water in the solution to precipitate crystals. However, in the process of leading out the water vapor, due to the low external temperature, the water vapor is condensed and flows back, and enters the solution again, resulting in reduced crystallization efficiency and increased energy loss. Therefore, through the restriction of a bottom ring and a top ring, the water vapor can only be led out from an opened gap after the air pressure is increased, and the reflux of condensed water is restricted. At the same time, the bottom ring is matched with the top ring and the guide groove, and the condensed water before the bottom ring and the top ring is introduced into a water accumulation cover through the guide groove, and the condensed water is led out of the device through a guide pipe to avoid condensation reflux, so that the evaporated water returns to the solution again, and needs to be heated and evaporated again, resulting in reduced crystallization efficiency and increased energy loss.

Description

Technical Field

[0001] The invention relates to the technical field of crystallization equipment, in particular to a crystallization equipment for N-vinyl pyrrolidone. Background Art

[0002] At present, N-vinyl pyrrolidone is an important organic compound. In the medical field, it is used as an excipient for drug preparations. In cosmetics, it is used as a hair fixative, moisturizer, etc. In industry, it is used for adhesives, coatings, etc. The crystal manufacturing of N-vinyl pyrrolidone usually adopts the method of evaporation crystallization to precipitate crystals from a solution containing N-vinyl pyrrolidone.

[0003] In the process of evaporation and crystallization, the water in the solution needs to be heated and evaporated to precipitate crystals. However, in the process of extracting water vapor, due to the low external temperature, the water vapor condenses and flows back and re-enters the solution, resulting in reduced crystallization efficiency and increased energy loss. Summary of the invention

[0004] To achieve the above object, the present invention is implemented by the following technical scheme: a crystallization device for N-vinyl pyrrolidone, comprising:

[0005] A crystallization tank, which provides a place for the crystallization process, and a connecting fastener is fixedly installed on the outside of the crystallization tank, and a motor is fixedly installed on the top of the crystallization tank, and the output end of the motor passes through the crystallization tank and extends into the inside thereof;

[0006] A frame having a framework for supporting the structural components, wherein the crystallization tank is installed inside the frame through connecting fasteners;

[0007] An exhaust mechanism, which is used to exhaust water vapor during the evaporation crystallization process, and the exhaust mechanism is installed on the top of the crystallization tank;

[0008] A stirring mechanism, which is used to stir the solution during the crystallization process, and the stirring mechanism is installed inside the crystallization tank, and the top of the stirring mechanism is connected to the output end of the motor;

[0009] Wherein, the exhaust mechanism includes a connecting pipe, a connecting plate is fixedly installed on the outer side of the connecting pipe, the connecting pipe is fixedly connected to the top of the crystallization tank through the connecting plate, and the bottom end of the connecting pipe passes through the crystallization tank and extends into the interior thereof, an exhaust pipe is fixedly installed on the top of the connecting pipe, and a top ring and a bottom ring are fixedly installed on the inner wall of the exhaust pipe. Through the restriction of the bottom ring and the top ring, water vapor can only be discharged from the opened gap after the air pressure is increased, thereby limiting the reflux of condensed water. At the same time, the bottom ring is coordinated with the top ring and the guide groove, and the condensed water between the bottom ring and the top ring is introduced into the water accumulation cover through the guide groove, and the condensed water is discharged from the device through the guide pipe to avoid condensation reflux, so that the evaporated water returns to the solution again, and needs to be heated and evaporated again, resulting in reduced crystallization efficiency and increased energy loss. The top ring is located above the bottom ring and there is a gap between them. Guide grooves are evenly opened on the outside of the exhaust pipe, and the bottom of the guide groove is flush with the top of the bottom ring. A water accumulation cover is fixedly installed at the guide groove on the outside of the exhaust pipe, and a guide pipe is installed at the bottom of the water accumulation cover.

[0010] Preferably, circular holes are provided at the center positions of the outer sides of the bottom ring and the top ring, and a baffle is slidably installed at the circular hole of the bottom ring, which cooperates with the baffle and the counterweight block, and utilizes the baffle to bear the air pressure, thereby driving the connecting rod and the counterweight block to move upward. At the same time, the weight of the counterweight block provides a limit for the air pressure required to open the gap between the bevel cover and the top ring, so as to avoid the gap opening when the air pressure is low, and the air flow speed being low, which makes it impossible to limit the condensed water on the top of the top ring, causing a large amount of condensed water to flow back. The circular hole of the top ring is clamped with a bevel cover, the outer side of the bevel cover is an arc-shaped bevel, and a connecting rod is fixedly installed at the bottom of the bevel cover, the outer side of the connecting rod is fixedly connected to the inner wall of the baffle, and a counterweight is fixedly installed at the bottom end of the connecting rod.

[0011] Preferably, the crystallization tank comprises an inner tank and an outer tank, the outer tank is fixedly mounted on the outer side of the inner tank, the top of the inner wall of the inner tank is provided with a thread, and the top of the inner wall of the inner tank is threadedly connected to a tank cover, the motor is fixedly mounted at the center position of the top of the tank cover, there is a gap between the inner tank and the outer tank, and a discharge pipe is fixedly mounted on the bottom of the inner tank, the bottom end of the discharge pipe passes through the outer tank and extends to the bottom thereof, a sealing block is detachably mounted on the bottom end of the discharge pipe, a swivel is rotatably mounted on the outer side of the discharge pipe, arc plates are evenly arranged on the outer side of the swivel, a hole ring is fixedly mounted between the inner tank and the outer tank, and through the cooperation between the swivel and the hole plate, when the hot gas rises from the bottom, it can only pass through The air holes of the hole ring move upward to limit the rising speed of the hot air, so that the hot air stays at the bottom of the hole ring for a longer time, releases more heat, and heats the internal solution from the bottom to avoid the liquid level from lowering after crystallization. The heating above cannot be directly transferred to the solution, reducing the heating efficiency. There are two hole rings, and air holes are evenly opened on the outside of the hole rings, and air guide plates are fixedly installed between the hole rings. The air guide plates are spiral plates, and the air guide plates are evenly installed along the center of the hole rings. A heat exhaust pipe is fixedly installed on the top of the outer side of the outer tank, and the heat exhaust pipe is located above the hole ring. A heat inlet pipe is fixedly installed on the bottom of the outer side of the outer tank, and the top of the heat inlet pipe is flush with the bottom of the rotating ring.

[0012] Preferably, the stirring mechanism comprises a transmission shaft, the top end of the transmission shaft is connected to the output end of the motor through a coupling, and a bearing is installed on the outer side of the transmission shaft, the transmission shaft is rotatably connected to the inner wall of the tank cover through the bearing, and the bottom end flange of the transmission shaft is connected to a connecting shaft, a collar is fixedly installed on the outer side of the connecting shaft, the collar is two in number and symmetrically installed along the center position of the axis of the connecting shaft, cross bars are symmetrically arranged on the inner wall of the collar, spiral plates are fixedly installed between the collars, and the spiral plates cooperate with the tooth column during the rotation process, and the spiral plates flip the upper and lower layers of the solution during the rotation process, so that the solution at the bottom that is heated more is flipped upwards, and at the same time During the flipping process, the air flow speed on the surface of the solution is increased, the evaporation rate is accelerated, and the crystals are precipitated and crystallized faster. At the same time, the tooth column precipitates the crystals adhering to the inner wall of the inner tank, and the precipitated crystals are crushed and scraped by the teeth to clean them from the inner wall to prevent heat transfer from being blocked. The upper and lower ends of the spiral plate are fixedly connected to the opposite surfaces of the cross bar, and the tooth column is rotatably installed between the opposite surfaces of the collar. The outer side of the tooth column is evenly provided with teeth, and a clamping block is fixedly installed at the bottom end of the connecting shaft, and a connecting arm is rotatably installed at the bottom of the clamping block. The connecting arm is symmetrically installed along the center position of the axis of the clamping block, and a scraper plate is rotatably installed at the end of the connecting arm away from the clamping block.

[0013] The present invention provides a crystallization device for N-vinyl pyrrolidone. It has the following beneficial effects:

[0014] 1. The crystallization equipment of N-vinyl pyrrolidone, through the restriction of the bottom ring and the top ring, allows water vapor to be discharged from the opened gap only after the air pressure is increased, thereby limiting the reflux of condensed water. At the same time, the bottom ring cooperates with the top ring and the guide groove to guide the condensed water between the bottom ring and the top ring into the water collection cover through the guide groove, and the condensed water is discharged from the equipment through the guide pipe to avoid condensation reflux, so that the evaporated water returns to the solution again, which needs to be heated and evaporated again, resulting in reduced crystallization efficiency and increased energy loss.

[0015] 2. The crystallization equipment of N-vinyl pyrrolidone cooperates with the baffle plate and the counterweight block, and uses the baffle plate to bear the air pressure to drive the connecting rod and the counterweight block to move upward. At the same time, the weight of the counterweight block provides a limit for the air pressure required to open the gap between the bevel cover and the top ring, thereby avoiding the gap opening when the air pressure is low, the air flow speed is low, and the condensed water on the top of the top ring cannot be limited, causing a large amount of condensed water to flow back.

[0016] 3. The crystallization equipment of N-vinyl pyrrolidone can only move upward through the pores of the orifice ring when the hot air rises from the bottom through the cooperation between the rotating ring and the orifice plate, thereby limiting the rising speed of the hot air and making the hot air stay at the bottom of the orifice ring for a longer time, releasing more heat, and heating the internal solution from the bottom to avoid the liquid level lowering after crystallization, and the upper heating cannot be directly transferred to the solution, reducing the heating efficiency.

[0017] 4. The crystallization equipment of N-vinyl pyrrolidone cooperates with the spiral plate and the tooth column during the rotation process. During the rotation process, the spiral plate flips the upper and lower layers of the solution, so that the solution at the bottom that is heated more flips upward. At the same time, the air flow speed on the surface of the solution is increased during the flipping process, which accelerates the evaporation rate and makes the crystals precipitate and crystallize faster. At the same time, the tooth column precipitates the crystals adhering to the inner wall of the inner tank, crushes and scrapes the precipitated crystals through the teeth, and cleans them from the inner wall to prevent heat transfer from being blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the external structure of a crystallization device for N-vinyl pyrrolidone according to the present invention;

[0019] Figure 2 It is a partial structural schematic diagram of a crystallization device for N-vinyl pyrrolidone of the present invention;

[0020] Figure 3 It is the structural dissection diagram of the crystallization tank of the present invention;

[0021] Figure 4 This is a schematic diagram of the stirring mechanism structure of the present invention;

[0022] Figure 5 It is a side view of the stirring mechanism structure of the present invention;

[0023] Figure 6 It is a schematic diagram of the exhaust mechanism structure of the present invention;

[0024] Figure 7 It is a partial structural anatomical diagram of the exhaust mechanism of the present invention;

[0025] Figure 8 It is a partial structural dissected side view of the exhaust mechanism of the present invention.

[0026] In the figure: 1, crystallization tank; 2, exhaust mechanism; 3, stirring mechanism; 4, motor; 5, frame; 6, fastener; 101, outer tank; 102, heat exhaust pipe; 103, heat inlet pipe; 104, sealing block; 105, discharge pipe; 106, rotating ring; 107, hole ring; 108, air guide plate; 109, inner tank; 110, tank cover; 201, exhaust pipe; 202, connecting pipe; 203, connecting plate ; 204, water collection cover; 205, guide pipe; 206, bottom ring; 207, connecting rod; 208, top ring; 209, counterweight; 210, baffle; 211, inclined cover; 301, collar; 302, connecting shaft; 303, transmission shaft; 304, bearing; 305, spiral plate; 306, tooth column; 307, cross bar; 308, connecting arm; 309, block; 310, scraper plate. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0028] The first embodiment, as Figure 1 and Figures 6 to 8 As shown, the present invention provides a technical solution: a crystallization device for N-vinyl pyrrolidone, comprising:

[0029] A crystallization tank 1, which provides a place for the crystallization process, and a connecting fastener 6 is fixedly installed on the outside of the crystallization tank 1, and a motor 4 is fixedly installed on the top of the crystallization tank 1, and the output end of the motor 4 passes through the crystallization tank 1 and extends into the inside thereof;

[0030] A frame 5, the frame 5 having a frame supporting the structural components, and the crystallization tank 1 is installed inside the frame 5 through a connecting fastener 6;

[0031] An exhaust mechanism 2, which is used to exhaust water vapor during the evaporation crystallization process, and the exhaust mechanism 2 is installed on the top of the crystallization tank 1;

[0032] A stirring mechanism 3, which is used to stir the solution during the crystallization process, and the stirring mechanism 3 is installed inside the crystallization tank 1, and the top of the stirring mechanism 3 is connected to the output end of the motor 4;

[0033] Wherein, the exhaust mechanism 2 includes a connecting pipe 202, a connecting plate 203 is fixedly installed on the outer side of the connecting pipe 202, the connecting pipe 202 is fixedly connected to the top of the crystallizer 1 through the connecting plate 203, and the bottom end of the connecting pipe 202 passes through the crystallizer 1 and extends to the inside thereof, an exhaust pipe 201 is fixedly installed on the top of the connecting pipe 202, a top ring 208 and a bottom ring 206 are fixedly installed on the inner wall of the exhaust pipe 201, the top ring 208 is located above the bottom ring 206 and there is a gap between them, guide grooves are evenly provided on the outer side of the exhaust pipe 201, and the bottom of the guide groove is flush with the top of the bottom ring 206, the temperature outside the crystallizer 1 is low, and the discharged water vapor is easy to condense, and in the process of discharging condensation, During the process of cooperation between the bottom ring 206 and the top ring 208, water vapor is discharged from a smaller gap, and the airflow for discharging water vapor limits the backflow of condensed water in the gap. At the same time, when condensation occurs between the bottom ring 206 and the top ring 208, the bottom of the guide groove is flush with the top of the bottom ring 206 through the guide groove on the outside of the exhaust pipe 201. After the water condensed on the inner wall of the exhaust pipe 201 slides down, it flows out of the exhaust pipe 201 along the guide groove and enters the water collection cover 204. The condensed water is introduced into the water collection cover 204 through the guide groove, and the condensed water is discharged through the guide pipe 205 to avoid backflow. The water collection cover 204 is fixedly installed at the guide groove on the outside of the exhaust pipe 201, and the guide pipe 205 is installed at the bottom of the water collection cover 204.

[0034] A circular hole is provided at the center of the outer side of the bottom ring 206 and the top ring 208, and a baffle 210 is slidably installed at the circular hole of the bottom ring 206, and a bevel cover 211 is clamped at the circular hole of the top ring 208. The outer side of the bevel cover 211 is an arc-shaped bevel, and a connecting rod 207 is fixedly installed at the bottom of the bevel cover 211. In the process of heating and evaporating water from the solution, the water vapor rises and is led out of the connecting pipe 202, so that the steam enters the exhaust pipe 201. As the water vapor inside accumulates continuously, the internal air pressure increases, and the increased air pressure The baffle plate 210 is pushed in the exhaust pipe 201, and the force applied to the baffle plate 210 causes the connecting rod 207 to move upward. During the upward movement of the connecting rod 207, the inclined cover 211 and the counterweight block 209 are driven to move upward together, so that the baffle plate 210 opens a gap with the bottom ring 206, and then the inclined cover 211 opens a gap with the top ring 208, allowing water vapor to pass through the gap and be discharged from the equipment. The outer side of the connecting rod 207 is fixedly connected to the inner wall of the baffle plate 210, and the counterweight block 209 is fixedly installed on the bottom end of the connecting rod 207.

[0035] The second embodiment is based on the first embodiment. Figures 2 to 3As shown, the crystallization tank 1 includes an inner tank 109 and an outer tank 101, the outer tank 101 is fixedly installed on the outside of the inner tank 109, the top of the inner wall of the inner tank 109 is provided with a thread, and the top of the inner wall of the inner tank 109 is threadedly connected with a tank cover 110, the motor 4 is fixedly installed at the center of the top of the tank cover 110, there is a gap between the inner tank 109 and the outer tank 101, and a discharge pipe 105 is fixedly installed at the bottom of the inner tank 109, and the bottom end of the discharge pipe 105 passes through the outer tank 101 and extends To the bottom, when the solution is introduced into the crystallization tank 1, the tank cover 110 is opened to allow the worker to introduce the solution into the inner tank 109, and the heat source pipeline is connected with the heat inlet pipe 103 and the heat exhaust pipe 102, so that the heat source steam is introduced into the gap between the inner tank 109 and the outer tank 101 through the heat inlet pipe 103 to heat the solution added to the inner tank 109. The bottom end of the discharge pipe 105 is detachably installed with a sealing block 104, and the outer side of the discharge pipe 105 is rotatably installed with a swivel 106.

[0036] The outer side of the rotating ring 106 is evenly provided with arc plates, and a hole ring 107 is fixedly installed between the inner tank 109 and the outer tank 101. The number of the hole rings 107 is two, and air holes are evenly opened on the outer side of the hole rings 107, and an air guide plate 108 is fixedly installed between the hole rings 107. The air guide plate 108 is a spiral plate, and the air guide plate 108 is evenly installed along the center position of the hole ring 107. The top of the outer side of the outer tank 101 is fixedly installed with a heat exhaust pipe 102, and the heat exhaust pipe 102 is located above the hole ring 107. When hot air is introduced, the air pressure enters the bottom of the outer tank 101 to blow the rotating ring. The arc plate 106 makes the rotating ring 106 rotate under the restriction of the discharge pipe 105. At the same time, when the rotating ring 106 rotates, it drives the incoming steam to spiral up and enter the space between the hole rings 107 through the air holes of the hole ring 107. In the space, the hot steam is conducted to the air holes of the hole ring 107 above through the spiral shape of the air guide plate 108, so that the hot steam passes through the air holes of the upper hole ring 107, and the hot air is discharged by the heat exhaust pipe 102. The bottom of the outer side of the outer tank 101 is fixedly installed with a heat inlet pipe 103, and the top of the heat inlet pipe 103 is flush with the bottom of the rotating ring 106.

[0037] The third embodiment is based on the first and second embodiments. Figures 4 to 5As shown, the stirring mechanism 3 includes a transmission shaft 303, the top end of the transmission shaft 303 is connected to the output end of the motor 4 through a coupling, and a bearing 304 is installed on the outer side of the transmission shaft 303, the transmission shaft 303 is rotatably connected to the inner wall of the tank cover 110 through the bearing 304, and the bottom end flange of the transmission shaft 303 is connected to the connecting shaft 302, and a collar 301 is fixedly installed on the outer side of the connecting shaft 302, the number of the collar 301 is two and they are symmetrically installed along the center position of the axis of the connecting shaft 302, the motor 4 drives the transmission shaft 303 to rotate, so that the transmission shaft 303 The movable shaft 303 drives the connecting shaft 302 to rotate under the restriction of the bearing 304, so that the connecting shaft 302 drives the ring 301 to rotate during the rotation. The cross bar 307 installed on the inner wall of the ring 301 drives the spiral plate 305 to rotate through the cross bar 307 when the ring 301 rotates. The inner wall of the ring 301 is symmetrically provided with cross bars 307 through the spiral plate of the spiral plate 305. The spiral plate 305 is fixedly installed between the rings 301, and the upper and lower ends of the spiral plate 305 are fixedly connected to the opposite surfaces of the cross bar 307.

[0038] A tooth column 306 is rotatably installed between the opposite surfaces of the collar 301, and teeth are evenly arranged on the outer side of the tooth column 306, and a block 309 is fixedly installed at the bottom end of the connecting shaft 302, and a connecting arm 308 is rotatably installed at the bottom of the block 309. During the rotation process, the upper and lower layers of the solution inside the crystallizer 1 are continuously turned over. At the same time, during the rotation of the collar 301, the tooth column 306 is driven to rotate along the inner wall of the crystallizer 1, and the precipitated crystals appearing on the inner wall are cleaned through the teeth arranged on the outer side of the tooth column 306. The connecting arm 308 is driven to rotate along the axial position of the connecting shaft 302 through the block 309 at the bottom of the connecting shaft 302. During the rotation process, the connecting arm 308 drives the scraper plate 310 to scrape along the bottom of the inner wall of the inner tank 109 to scrape up the crystals at the bottom. The connecting arm 308 is symmetrically installed along the axial center position of the block 309, and the end of the connecting arm 308 away from the block 309 is rotatably installed with a scraper plate 310.

[0039] When in use, a worker opens the crystallizer 1 and introduces the manufactured N-vinyl pyrrolidone solution into the crystallizer 1, connects a hot steam pipe to the crystallizer 1, heats the solution inside the crystallizer 1 by the hot steam, evaporates the water in the solution into water vapor during the heating process, and leads out of the crystallizer 1 through the exhaust mechanism 2. During the heating process, a worker starts the motor 4 to drive the stirring mechanism 3 to rotate, and stirs the solution inside the crystallizer 1. During the continuous heating process of the solution, the water gradually decreases, and the N-vinyl pyrrolidone in the solution is crystallized and precipitated from the solution.

[0040] When the solution is introduced into the crystallization tank 1, the tank cover 110 is opened to allow the worker to introduce the solution into the inner tank 109, and the heat source pipeline is connected to the heat inlet pipe 103 and the heat exhaust pipe 102, so that the heat source steam is introduced into the gap between the inner tank 109 and the outer tank 101 through the heat inlet pipe 103, and the solution added to the inner tank 109 is heated. When the hot gas is introduced, the air pressure enters the bottom of the outer tank 101 to blow the arc plate of the rotating ring 106, so that the rotating ring 106 rotates under the restriction of the discharge pipe 105. At the same time, when the rotating ring 106 rotates, it drives the incoming steam to spirally rise, and enters the space between the hole rings 107 through the air holes of the hole rings 107, and in the space, through the spiral shape of the air guide plate 108, the hot steam is conducted to the air holes of the hole ring 107 above, so that the hot steam passes through the air holes of the upper hole ring 107, and the hot gas is discharged by the heat exhaust pipe 102.

[0041] During the process of heating the internal solution and raising the temperature, the worker starts the motor 4, so that the motor 4 drives the transmission shaft 303 to rotate, and the transmission shaft 303 drives the connecting shaft 302 to rotate under the restriction of the bearing 304, so that the connecting shaft 302 drives the collar 301 to rotate during the rotation, and the collar 301 drives the spiral plate 305 to rotate through the cross bar 307 installed on the inner wall of the collar 301 during the rotation, and the spiral plate of the spiral plate 305 drives the crystallization during the rotation. The upper and lower layers of the solution inside the tank 1 are constantly flipped. At the same time, during the rotation of the sleeve ring 301, the tooth column 306 is driven to rotate along the inner wall of the crystallization tank 1. The precipitated crystals appearing on the inner wall are cleaned by the teeth arranged on the outer side of the tooth column 306. The connecting arm 308 is driven to rotate along the axial position of the connecting shaft 302 through the block 309 at the bottom end of the connecting shaft 302. During the rotation, the connecting arm 308 drives the scraper plate 310 to scrape along the bottom of the inner wall of the inner tank 109 to scrape up the crystals at the bottom.

[0042] In the process of heating the solution to evaporate water, the water vapor rises and is led out of the connecting pipe 202, so that the steam enters the exhaust pipe 201. As the water vapor inside accumulates continuously, the internal air pressure increases, and the increased air pressure pushes the baffle plate 210 in the exhaust pipe 201. The baffle plate 210 is subjected to force, so that the connecting rod 207 moves upward. In the process of the connecting rod 207 moving upward, the inclined mask 211 and the counterweight block 209 are driven to move upward together, so that the baffle plate 210 opens the gap with the bottom ring 206, and the inclined mask 211 opens the gap with the top ring 208, so that the water vapor can be discharged from the exhaust pipe 201. The steam passes through the gap and is discharged from the equipment. At the same time, the temperature outside the crystallization tank 1 is relatively low, and the discharged water vapor is prone to condensation. In the process of discharge and condensation, the water vapor is discharged from a smaller gap through the cooperation of the bottom ring 206 and the top ring 208. The airflow of the discharged water vapor limits the backflow of condensed water in the gap. At the same time, when condensation occurs between the bottom ring 206 and the top ring 208, the condensed water is introduced into the water collection cover 204 through the guide groove on the outside of the exhaust pipe 201, and the condensed water is discharged through the guide pipe 205 to avoid backflow.

[0043] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A crystallization device for N-vinyl pyrrolidone, characterized in that: include: A crystallization tank (1), the crystallization tank (1) providing a place for a crystallization process, and a connecting fastener (6) is fixedly installed on the outer side of the crystallization tank (1), and a motor (4) is fixedly installed on the top of the crystallization tank (1), and the output end of the motor (4) passes through the crystallization tank (1) and extends into the interior thereof; A frame (5), the frame (5) having a framework for supporting the structural components, the crystallization tank (1) being mounted inside the frame (5) via a connecting fastener (6); An exhaust mechanism (2), the exhaust mechanism (2) being used to exhaust water vapor during the evaporation crystallization process, and the exhaust mechanism (2) being installed on the top of the crystallization tank (1); A stirring mechanism (3), the stirring mechanism (3) is used to stir the solution during the crystallization process, and the stirring mechanism (3) is installed inside the crystallization tank (1), and the top end of the stirring mechanism (3) is connected to the output end of the motor (4); The exhaust mechanism (2) comprises a connecting pipe (202), a connecting plate (203) is fixedly mounted on the outer side of the connecting pipe (202), the connecting pipe (202) is fixedly connected to the top of the crystallization tank (1) via the connecting plate (203), and the bottom end of the connecting pipe (202) passes through the crystallization tank (1) and extends into the interior thereof, an exhaust pipe (201) is fixedly mounted on the top of the connecting pipe (202), a top ring (208) and a bottom ring (206) are fixedly mounted on the inner wall of the exhaust pipe (201), the top ring (208) is located above the bottom ring (206) with a gap therebetween, guide grooves are evenly arranged on the outer side of the exhaust pipe (201), and the bottom of the guide grooves is flush with the top of the bottom ring (206), a water accumulation cover (204) is fixedly mounted on the guide groove on the outer side of the exhaust pipe (201), and a flow guide pipe (205) is mounted at the bottom of the water accumulation cover (204); A circular hole is provided at the center of the outer sides of the bottom ring (206) and the top ring (208), and a baffle (210) is slidably mounted at the circular hole of the bottom ring (206), and a bevel cover (211) is clamped at the circular hole of the top ring (208); The outer side of the bevel cover (211) is an arc-shaped bevel, and a connecting rod (207) is fixedly installed at the bottom of the bevel cover (211), the outer side of the connecting rod (207) is fixedly connected to the inner wall of the baffle (210), and a counterweight (209) is fixedly installed at the bottom end of the connecting rod (207); The crystallization tank (1) comprises an inner tank (109) and an outer tank (101), the outer tank (101) being fixedly mounted on the outer side of the inner tank (109), the inner wall of the inner tank (109) having a threaded top, and the inner wall of the inner tank (109) having a tank cover (110) threadedly connected to the top, and the motor (4) being fixedly mounted at the center of the top of the tank cover (110); There is a gap between the inner tank (109) and the outer tank (101), and a discharge pipe (105) is fixedly installed at the bottom of the inner tank (109), the bottom end of the discharge pipe (105) passes through the outer tank (101) and extends to the bottom thereof, a sealing block (104) is detachably installed at the bottom end of the discharge pipe (105), and a swivel (106) is rotatably installed on the outer side of the discharge pipe (105); The stirring mechanism (3) comprises a transmission shaft (303), the top end of the transmission shaft (303) being connected to the output end of the motor (4) via a coupling, and a bearing (304) being installed on the outer side of the transmission shaft (303), the transmission shaft (303) being rotatably connected to the inner wall of the tank cover (110) via the bearing (304), and the bottom end of the transmission shaft (303) being flange-connected to a connecting shaft (302); A collar (301) is fixedly mounted on the outer side of the connecting shaft (302), the collar (301) is two in number and is symmetrically mounted along the central position of the axis of the connecting shaft (302), a cross bar (307) is symmetrically arranged on the inner wall of the collar (301), a spiral plate (305) is fixedly mounted between the collars (301), and the upper and lower ends of the spiral plate (305) are fixedly connected to the opposite surfaces of the cross bar (307); A tooth column (306) is rotatably mounted between opposite surfaces of the collar (301), teeth are evenly arranged on the outer side of the tooth column (306), a clamping block (309) is fixedly mounted on the bottom end of the connecting shaft (302), a connecting arm (308) is rotatably mounted on the bottom of the clamping block (309), the connecting arm (308) is symmetrically mounted along the central position of the axis of the clamping block (309), and a scraper plate (310) is rotatably mounted on one end of the connecting arm (308) away from the clamping block (309).

2. The crystallization device of N-vinyl pyrrolidone according to claim 1, characterized in that: Arc plates are evenly arranged on the outer side of the rotating ring (106), and a hole ring (107) is fixedly installed between the inner tank (109) and the outer tank (101). The number of the hole rings (107) is two, and air holes are evenly opened on the outer side of the hole rings (107). An air guide plate (108) is fixedly installed between the hole rings (107), and the air guide plate (108) is a spiral plate, and the air guide plate (108) is evenly installed along the center position of the hole ring (107).

3. The crystallization device of N-vinyl pyrrolidone according to claim 2, characterized in that: A heat exhaust pipe (102) is fixedly mounted on the top of the outer side of the outer tank (101), and the heat exhaust pipe (102) is located above the hole ring (107). A heat inlet pipe (103) is fixedly mounted on the bottom of the outer side of the outer tank (101), and the top of the heat inlet pipe (103) is flush with the bottom of the rotating ring (106).

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