Membrane stacked type continuous cooling crystallizer

Abstract

The invention relates to a diaphragm stacked type continuous cooling crystallizer which is provided with a crystallization kettle, the crystallization kettle comprises an upper kettle body, a lower kettle body and a middle kettle body, the middle kettle body comprises at least one connecting kettle, a feeding pipe is arranged on the upper kettle body, a discharging pipe is arranged on the lower kettle body, a driving motor is further arranged on the upper kettle body, and a driving shaft is arranged in the crystallization kettle. Membrane frames are arranged in the upper kettle body, all the connecting kettles and the lower kettle body, all the membrane frames are installed on a driving shaft, jackets are arranged on the outer walls of the upper kettle body, all the connecting kettles and the lower kettle body, first liquid inlet pipes and first liquid outlet pipes are arranged on the jackets, butt joint heat exchange flanges are arranged between the middle kettle body and the upper kettle body and between all the connecting kettles, and the butt joint heat exchange flanges are connected with the middle kettle body. A heat exchange cavity is formed in the butt joint heat exchange flange, a second liquid inlet pipe and a second liquid outlet pipe are arranged on the butt joint heat exchange flange, the upper end of the middle kettle body is in sealed connection with the upper kettle body, the connecting kettles are in sealed connection, and the middle kettle body is in sealed connection with the lower kettle body. The device is ingenious in structure, good in universality, convenient to use and practical.

Description

Technical Field

[0001] The invention relates to the field of cooling crystallization, in particular to a diaphragm stack type continuous cooling crystallizer. Background Art

[0002] A cooling crystallizer is a device that relies on lowering the material temperature to produce supersaturation in the material and ultimately promote crystallization of the material. Its working principle involves heat transfer and material transfer processes. When the solute in the solution is supersaturated, the crystallizer controls the temperature to promote the solute to crystallize and deposit into solid particles. Cooling crystallizers can be divided into internal circulation cooling type and external circulation cooling type crystallizers according to their cooling form.

[0003] The existing cooling crystallizer is customized according to the actual use environment, and after the crystallizer is prepared according to the size of the crystallizer, with the changes in different use environments and use scenarios, it is necessary to prepare a variety of crystallizers of different sizes, the preparation cost is high, the compatibility is poor, and it is not convenient to transport, install, and disassemble the crystallizer, which is very inconvenient. Summary of the invention

[0004] The purpose of the present invention is to provide a diaphragm stack continuous cooling crystallizer with an ingenious structure. Crystallizers of different sizes can be prepared according to actual use environments and usage scenarios. It has good adjustability and versatility and is convenient and practical.

[0005] The technical solution for achieving the purpose of the present invention is as follows: the present invention has a crystallization kettle, which comprises an upper kettle body connected to each other, a lower kettle body coaxially arranged with the upper kettle body, and an intermediate kettle body arranged between the upper kettle body and the lower kettle body, the intermediate kettle body comprising at least one connecting kettle coaxially arranged with the upper kettle body, the upper kettle body being provided with a feed pipe, the lower kettle body being provided with a discharge pipe, the upper kettle body being further provided with a drive motor, a drive shaft which can be rotated in the crystallization kettle under the drive of the drive motor is provided in the crystallization kettle, the drive shaft is coaxially arranged with the crystallization kettle, a diaphragm frame which can stir the feed is provided in the upper kettle body, each connecting kettle body and the lower kettle body, each diaphragm frame is installed on the drive shaft and stirs the feed along with the rotation of the drive shaft, a jacket is provided on the outer wall of the upper kettle body, the jacket on the upper kettle body and the outer wall of the upper kettle body, the jacket on the connecting kettle and the outer wall of the connecting kettle, and the jacket on the lower kettle body The outer walls of the jacket and the lower kettle body both form a condensation cavity, the jacket is provided with a first liquid inlet pipe for inputting condensation medium into the condensation cavity, and a first liquid outlet pipe for discharging the condensation medium in the condensation cavity, a butt heat exchange flange for increasing the heat exchange area and for slidingly guiding the crystals after condensation is provided between the middle kettle body and the upper kettle body, and between each connecting kettle, the butt heat exchange flange is funnel-shaped, a heat exchange cavity for containing condensation medium is provided in the butt heat exchange flange, a second liquid inlet pipe for inputting condensation medium into the inner cavity of the butt heat exchange flange, and a second liquid outlet pipe for discharging the condensation medium in the inner cavity of the butt heat exchange flange are provided on the butt heat exchange flange, the upper end of the middle kettle body is sealedly connected to the upper kettle body through the butt heat exchange flange, and is fixedly connected to the upper kettle body through a locking piece, each connecting kettle is also sealedly connected through the butt heat exchange flange and fixed by a locking piece, the lower end of the middle kettle body is sealedly connected to the lower kettle body and fixed by a locking piece.

[0006] Furthermore, the diaphragm frame includes a first connecting shaft sleeve and a second connecting shaft sleeve detachably mounted on the drive shaft, and side frames symmetrically arranged on both sides of the first connecting shaft sleeve along the axis of the first connecting shaft sleeve, the first connecting shaft sleeve and the second connecting shaft sleeve are both coaxially arranged with the drive shaft, and the side frame includes an upper diaphragm plate integrally formed with the first connecting shaft sleeve, a lower diaphragm plate integrally formed with the second connecting shaft sleeve, and a side diaphragm plate for connecting the upper diaphragm plate and the lower diaphragm plate, each side diaphragm plate is provided with a plurality of side scraper groups that can scrape off frost or crystallization on the inner wall of the upper kettle body or the inner wall of the connecting kettle or the inner wall of the lower kettle body, the side scraper groups on each side diaphragm plate are centrally symmetrically arranged, and each side scraper group includes a plurality of side scrapers, and each side scraper on the side diaphragm plate on one side of the drive shaft is connected to the side diaphragm plate on the other side of the drive shaft The side scrapers on the upper membrane are staggered, and each lower membrane plate is provided with a lower scraper group for scraping frost and crystallization on the upper end surface of the butt heat exchange flange, and each lower scraper group on each lower membrane plate is centrally symmetrically arranged. The lower scraper group includes multiple lower scrapers, and each lower scraper on the lower membrane plate on one side of the drive shaft is staggered with each lower scraper on the lower membrane plate on the other side of the drive shaft. Each upper membrane plate in each connecting kettle is provided with an upper scraper group for scraping frost and crystallization on the lower end surface of the butt heat exchange flange, and each upper scraper group on each upper membrane plate is centrally symmetrically arranged, and each upper scraper on the upper membrane plate on one side of the drive shaft is staggered with each upper scraper on the upper membrane plate on the other side of the drive shaft. Each upper scraper, each side scraper, and each side scraper on the side frame are arranged on the same side of the side frame.

[0007] Furthermore, the above-mentioned driving shaft is provided with a first wedge-shaped connecting block adapted to the first connecting sleeve, and a second wedge-shaped connecting block adapted to the second connecting sleeve, the first connecting sleeve is provided with a first wedge-shaped through hole, and the second connecting sleeve is provided with a second wedge-shaped through hole, the first connecting sleeve is connected to the driving shaft through the cooperation between the first wedge-shaped through hole and the first wedge-shaped connecting block, and is fixed to the driving shaft through a locking piece, the second connecting sleeve is connected to the driving shaft through the cooperation between the second wedge-shaped through hole and the second wedge-shaped connecting block, and is fixed to the driving shaft through a locking piece, and the diaphragm frame is fixedly connected to the driving shaft through the cooperation between the first connecting sleeve and the driving shaft, and the cooperation between the second connecting sleeve and the driving shaft.

[0008] The cam is an angular channel formed between a pair of cam faces and a pair of cams, and the cams are connected to a pair of cams with a plurality of cams having a plurality of cams and a plurality of cams having a plurality of cams. The cams are connected to the pair of cams by a plurality of cams having a plurality of cams and a plurality of cams having a plurality of cams. The cams are connected to the pair of cams by a plurality of cams.

[0009] Furthermore, the butt heat exchange flange comprises a heat exchange flange portion, and a heat exchange portion integrally formed with the heat exchange flange portion and funnel-shaped, each heat exchange portion is provided with an inner hole for the drive shaft to pass through, the heat exchange chamber is arranged in the heat exchange portion, and the heat exchange chamber is annular, the second liquid inlet pipe is connected with the heat exchange chamber after passing through the heat exchange flange portion, and the second liquid outlet pipe is connected with the heat exchange chamber after passing through the heat exchange flange portion, the heat exchange chamber is provided with an annular first partition plate and a second partition plate, the first partition plate and the second partition plate are both coaxially arranged with the drive shaft, and the diameter of the second partition plate is larger than the diameter of the first partition plate, the heat exchange chamber is divided into a first heat exchange chamber, a second heat exchange chamber and a third heat exchange chamber by the first partition plate and the second partition plate, the first partition plate is provided with a plurality of diversion holes distributed on the first partition plate along the circumference of the axis of the drive shaft, the second partition plate is also provided with a plurality of diversion holes distributed on the second partition plate along the circumference of the axis of the drive shaft, the first heat exchange chamber, the second heat exchange chamber and the third heat exchange chamber are connected through each diversion hole.

[0010] Furthermore, the second liquid inlet pipe is connected to an injection pipe, which is fixed on the first partition plate and the second partition plate. One end of the injection pipe is connected to the second liquid inlet pipe, and the other end of the injection pipe passes through the second partition plate and the first partition plate and extends into the first heat exchange chamber and is connected to the first heat exchange chamber.

[0011] Furthermore, the diaphragm frame includes a first connecting sleeve and a second connecting sleeve detachably mounted on the drive shaft, and side frames symmetrically arranged on both sides of the first connecting sleeve along the axis of the first connecting sleeve, the first connecting sleeve and the second connecting sleeve are both coaxially arranged with the drive shaft, the side frame includes an upper diaphragm plate integrally formed with the first connecting sleeve, a lower diaphragm plate integrally formed with the second connecting sleeve, and a side diaphragm plate for connecting the upper diaphragm plate and the lower diaphragm plate, a positioning plate is provided on the upper diaphragm plate of each connecting kettle, a side pressure plate is provided on the positioning plate, a side scraping groove on the side pressure plate, the side scraping groove of the side pressure plate is pressed against the hole wall of the inner hole of the heat exchange part, and the side scraping groove on the side pressure plate scrapes off frost and crystallization on the hole wall of the inner hole of the heat exchange part through the rotation of the diaphragm frame.

[0012] Furthermore, the upper kettle body is provided with a first flange portion, the upper end of each connected kettle is provided with a second flange portion, the lower end of each connected kettle is provided with a third flange portion, and the lower kettle body is provided with a fourth flange portion, and the first flange portion, the second flange portion, the third flange portion, the fourth flange portion, and the upper and lower end surfaces of the heat exchange flange portion are all provided with connecting bosses, and each connecting boss is coaxially arranged with the drive shaft, and the connecting bosses on the first flange portion, the second flange portion and the third flange portion are all provided with connecting ring grooves coaxially arranged with the connecting bosses, and the upper end surface and the lower end surface of the heat exchange flange portion, as well as the fourth flange portion, are provided with connecting convex rings coaxially arranged with the connecting bosses, and the upper ends of the upper kettle body and the middle kettle body are connected to the connecting bosses on the first flange portion through the connecting convex rings on the upper end surfaces of the heat exchange flange portions. The plug-in fit of the ring groove, and the plug-in fit of the connecting convex ring on the lower end surface of the heat exchange flange and the connecting ring groove on the second flange portion closest to the upper kettle body are sealed and connected to the butt heat exchange flange and fixed by a locking piece. Each adjacent connecting kettle is sealed and connected to the butt heat exchange flange through the plug-in fit of the connecting ring groove on the third flange portion and the connecting convex ring on the upper end surface of the heat exchange flange portion, and the connecting convex ring on the lower end surface of the heat exchange flange portion and the connecting ring groove on the second flange portion of the adjacent connecting kettle, and fixed by a locking piece. The lower kettle body is sealed and connected to the connecting kettle closest to the lower kettle body through the plug-in fit of the connecting convex ring on the fourth flange portion and the connecting ring groove on the third flange portion of the connecting kettle closest to the lower kettle body, and is fixedly connected by a locking piece.

[0013] Furthermore, the upper kettle body is provided with a connecting base plate, a connecting bracket is fixedly provided on the connecting base plate, the driving motor is fixedly installed on the connecting bracket, a transmission shaft coaxially arranged with the driving shaft is fixedly provided on the output end of the driving motor, a bearing seat is fixedly provided in the connecting bracket, a plurality of transmission bearings coaxially arranged with the transmission shaft are provided in the bearing seat, each transmission bearing on the bearing seat is sleeved on the transmission shaft, a mechanical seal coaxially arranged with the transmission shaft is provided on the connecting base plate, the transmission shaft is connected to the driving shaft after passing through the mechanical seal, the connecting base plate and the upper kettle body, a connecting flange is provided between the transmission shaft and the driving shaft, and the transmission shaft and the driving shaft are connected through the connecting flange.

[0014] Furthermore, a discharging kettle coaxially arranged and connected to the lower kettle body is provided at the bottom of the above-mentioned lower kettle body, a communicating aeration pipe is provided on the side wall of the discharging kettle, one end of the driving shaft is connected to the transmission shaft through a connecting flange, and the other end of the driving shaft is rotatably connected in the discharging kettle, the discharging pipe is arranged on the discharging kettle and connected to the discharging kettle, the discharging pipe is arranged at the bottom of the discharging kettle, and a diaphragm frame is also provided in the discharging kettle, the diaphragm frame rotates in the discharging kettle and stirs the feed through the driving of the transmission shaft by the driving motor and the connection between the transmission shaft and the driving shaft.

[0015] The present invention has positive effects: (1) The present invention arranges the crystallization kettle into a connection of an upper kettle body, a lower kettle body and an intermediate kettle body, and arranges the intermediate kettle body to be coaxially spliced ​​by a plurality of connected kettles. The size of the intermediate kettle body can be changed according to the actual use environment and use scene. At the same time, the intermediate kettle body is arranged as a connection of a plurality of connected kettles, which can facilitate the installation and disassembly of the intermediate kettle body with the upper kettle body and the lower kettle body. On the other hand, it is also convenient for the transportation of the crystallization kettle. In addition, the intermediate kettle body is arranged as a connection of a plurality of connected kettles, which can realize the transportation of the crystallization kettle to the use site after the processing is completed at the processing site, or it can also be directly spliced ​​on site. It has good versatility and applicability. A condensation chamber is arranged on the lower kettle body. After the heat exchange medium is input into the condensation chamber, the feed is cooled continuously for multiple times through the upper kettle body, each connecting kettle and the lower kettle body. A butt heat exchange flange is arranged between the middle kettle body and the upper kettle body, as well as between each connecting kettle. The butt heat exchange flange can ensure the tightness of the connection between the upper kettle body and the middle kettle body, as well as between each connecting kettle, on the one hand, and increase the overall heat exchange area by arranging the butt heat exchange flange. The funnel-shaped arrangement can guide the transfer of the frost or crystallization to be removed. While ensuring the continuous multi-stage cooling and crystallization of the feed, it also greatly improves the efficiency of crystallization and the crystallization rate in the feed. The structure is ingenious and convenient and practical.

[0016] (2) The present invention provides symmetrically arranged side frames on both sides of the first connecting sleeve and the second connecting sleeve, and provides multiple upper scrapers on the upper membrane plate and multiple lower scrapers on the lower membrane plate. The upper scrapers on the upper membrane plates on both sides are staggered, and the upper scrapers and lower scrapers are used to comprehensively scrape off frost and crystals from the upper end face and the lower end face of the butt heat exchange flange. Multiple side scrapers are provided on each side membrane plate, and the side scrapers on each side membrane plate are staggered, so that frost and crystals can be comprehensively scraped off from the sides of the upper kettle body, each connecting kettle body and the lower kettle body. The upper scraper, side scraper and lower scraper on a side frame are arranged on the same side of the side frame, and the upper scraper, side scraper and lower scraper on the opposite side frames are centrally symmetrically arranged, so that during the rotation of the driving shaft, frost and crystals can be comprehensively and efficiently scraped off from the upper and lower end faces of the butt heat exchange flange, the inner wall of the upper kettle body, the inner wall of the connecting kettle and the inner wall of the lower kettle body.

[0017] (3) The present invention arranges a first wedge-shaped connecting block and a second wedge-shaped connecting block on the driving shaft, arranges a first wedge-shaped through hole on the first connecting sleeve, and arranges a second wedge-shaped through hole on the second connecting sleeve. The diaphragm frame is fixedly connected to the driving shaft in a detachable manner through the plug-in cooperation between the first wedge-shaped connecting block and the first wedge-shaped through hole, and the plug-in cooperation between the second wedge-shaped connecting block and the second wedge-shaped through hole. After being fixed by a locking member, the stability and firmness of the connection between the diaphragm frame and the driving shaft are ensured, which facilitates the stable installation of the diaphragm frame and the rapid disassembly and replacement of the diaphragm frame, and is convenient and practical.

[0018] (4) The present invention arranges the upper scraper, the side scraper and the lower scraper into a mounting seat, a connection plate body and a scraper portion, and arranges a scraping slope, so that each scraper portion forms a line contact with the inner wall of the connection kettle, the inner wall of the lower kettle body, and the upper end face and the lower end face of the butt heat exchange flange. The formed line contact can, on the one hand, increase the pressure of the scraper portion against the inner wall of the connection kettle, the inner wall of the lower kettle body, and the upper end face and the lower end face of the butt heat exchange flange based on the line contact when the scraper portion just contacts the inner wall of the connection kettle, the inner wall of the lower kettle body, and the upper end face and the lower end face of the butt heat exchange flange, thereby avoiding the scraper portion from contacting the connection kettle and the lower kettle. The problem of scraping leakage caused by incomplete contact between the body and the inner wall of the upper kettle body is solved by setting the width of the upper slot of the connecting slot to be smaller than the width of the slot bottom, so that the cross-section of the connecting slot is wedge-shaped, and the connecting slot, the plug plate body and the scraper part are set to be of equal length. On the one hand, it can facilitate the rapid installation, disassembly and replacement of the scraper part. On the other hand, during the installation and disassembly of the scraper part, the plug plate body can be inserted from the side of the connecting slot and fixed with the connecting plate body after being fixed by a locking piece, which can effectively prevent the scraper part from escaping from the connecting slot during the scraping process, thereby ensuring the overall stability and safety of the scraper part after being connected to the connecting plate body.

[0019] (5) The present invention arranges the butt heat exchange flange to cooperate with the heat exchange flange part and the heat exchange part, and the heat exchange part is funnel-shaped. On the one hand, the heat exchange part can increase the overall heat exchange area and the flow guidance of the crystals. The heat exchange chamber is divided into the first heat exchange chamber, the second heat exchange chamber and the third heat exchange chamber by the first partition plate and the second partition plate. By dividing the multiple heat exchange chambers and arranging the first heat exchange chamber, the second heat exchange chamber and the third heat exchange chamber from low to high, in the process of the heat exchange part guiding the crystals, on the one hand, the heat exchange part is guaranteed to precipitate the crystals in the feed. On the other hand, in the process of the heat exchange part guiding the crystals, the crystals are prevented from being re-integrated into the feed, thereby ensuring the quality of the crystal precipitation.

[0020] (6) The present invention provides a liquid injection pipe on the second liquid inlet pipe, and injects condensing medium into the first heat exchange chamber through the liquid inlet pipe. The condensing medium in the first heat exchange chamber then enters the second heat exchange chamber and the third heat exchange chamber in sequence through the diversion hole. The condensing medium first enters the first heat exchange chamber for heat exchange, and then enters the second heat exchange chamber and the third heat exchange chamber for heat exchange treatment. On the one hand, after the condensing medium is introduced into the first heat exchange chamber for heat exchange, the condensing medium after heat exchange can be partially heat exchanged from the second heat exchange chamber and the third heat exchange chamber. After the heat exchange in the first heat exchange chamber is completed, the condensing medium continuously injected into the pipe enters the second heat exchange chamber from the first heat exchange chamber, and the heat exchange of the first heat exchange chamber is carried out. After the heat exchange in the second heat exchange chamber is completed, the heat exchange in the third heat exchange chamber is carried out. After the heat exchange in the second heat exchange chamber is completed, the condensed medium enters the third heat exchange chamber. On the one hand, it can ensure that the condensed medium can fully and efficiently perform heat exchange treatment on the heat exchange chamber, thereby improving the heat exchange efficiency. On the other hand, the heat exchange chamber is not separated and is not injected from the bottom. After the condensed medium enters the second liquid inlet pipe, it is discharged from the second liquid outlet pipe after partial heat exchange. Not only can comprehensive heat exchange not be achieved, but the condensed medium cannot be fully utilized. Therefore, by separating and injecting from the first heat exchange layer, the efficiency can be improved while the utilization rate of the condensed medium can be improved.

[0021] (7) The present invention arranges a positioning plate on the upper membrane plate, arranges a side pressure plate on the positioning plate, and arranges a side scraping groove on the side pressure plate. When the driving shaft rotates, the arranged side scraper can scrape off frost and crystallization on the inner hole wall at the bottom end of the heat exchange part. When the driving shaft does not rotate, the heat exchange part is supported, thereby ensuring the stability of the docking heat exchange flange during the heat exchange and crystallization process.

[0022] (8) The present invention seals and connects the upper kettle body to the upper end of the middle kettle body, each connecting kettle, and the lower unit of the middle kettle body to the lower kettle body by providing a connecting ring groove and a connecting convex ring, and fixes the sealing connection by a locking member after the sealing connection, thereby ensuring the sealing and stability of the crystallization kettle as a whole, which is convenient and practical.

[0023] (9) The present invention arranges a connecting bottom plate, a connecting bracket and a mechanical seal on the upper kettle body, ensures the stability of the installation of the drive motor through the connecting bracket, arranges a plurality of transmission bearings on the bearing seat, and arranges a connecting flange between the transmission shaft and the drive shaft, thereby ensuring the smoothness of the rotation of the transmission shaft, as well as the high efficiency, stability and sealing of the transmission between the transmission shaft and the drive shaft.

[0024] (10) The present invention provides a discharge kettle at the bottom of the lower kettle body and an aeration pipe on the discharge kettle. When the discharge pipe is blocked, gas or liquid can be introduced through the aeration pipe to clear the pipe, thereby ensuring smooth crystallization discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments and in conjunction with the accompanying drawings, wherein Figure 1 It is a schematic diagram of the overall structure of the membrane stack continuous cooling crystallizer in the present invention; Figure 2 It is a cross-sectional view of the overall structure of the diaphragm stack continuous cooling crystallizer in the present invention; Figure 3 A cross-sectional view of the connection structure between the driving motor and the connection bracket in the present invention; Figure 4 It is a cross-sectional view of the connection structure between the upper kettle body and the connecting kettle in the present invention; Figure 5 for Figure 4 The enlarged view of point A in the middle; Figure 6 It is a cross-sectional view of the overall structure connecting the kettle and the diaphragm frame in the present invention; Figure 7 A cross-sectional view of the overall structure of the first connecting sleeve and the first wedge connection in the present invention; Figure 8 A cross-sectional view of the overall structure of the second connecting sleeve and the second wedge connection in the present invention; Fig. 9 An exploded view of the connection structure between the scraper portion and the connection plate body in the present invention; Fig.10 It is a schematic diagram of the overall structure of the butt heat exchange flange in the present invention; Fig.11 A cross-sectional view of the overall structure of the heat exchange flange in the present invention; Fig.12 for Fig.11 The enlarged view of point B in the middle; Fig.13 It is a cross-sectional view of the overall structure of the discharge kettle in the present invention. DETAILED DESCRIPTION

[0026] See Figures 1 to 13 The present invention has a crystallization kettle, which includes an upper kettle body 1 connected to each other, a lower kettle body 3 coaxially arranged with the upper kettle body 1, and an intermediate kettle body arranged between the upper kettle body 1 and the lower kettle body 3, wherein the intermediate kettle body includes at least one connecting kettle 2 coaxially arranged with the upper kettle body 1, a feed pipe 11 is arranged on the upper kettle body 1, and a discharge pipe 41 is arranged on the lower kettle body 3. The upper kettle body 1 is also provided with an overflow port to prevent the feed in the crystallization kettle from being filled and overflowing, and the upper kettle body 1 is also provided with a driving motor 6. The crystallization kettle is provided with a driving shaft 10 that can be rotated under the drive of the driving motor 6. The driving motor 6 is driven to rotate the driving shaft 10 arranged in the crystallization kettle. The driving shaft 10 is coaxially arranged with the crystallization kettle. The upper kettle body 1, each connecting kettle 2 and the lower kettle body are all provided with a diaphragm frame 9 for stirring the feed. Each diaphragm frame 9 is installed on the driving shaft 10 and stirs the feed along with the rotation of the driving shaft 10. The side walls of the upper kettle body 1 and the connecting kettle 2 are provided with a manhole c for maintenance and assembly. The manhole c is provided with a sight glass d for inspecting the stirring and crystallization conditions in the crystallization kettle. The manhole c fits the side walls of the upper kettle body 1 and the connecting kettle 2 without dead angles. The crystals on the inner wall of the sight glass d can be scraped off by the diaphragm frame 9 to ensure that there is no crystal adhesion on the inner wall of the sight glass d. 1. A jacket 7 is provided on the outer wall of each connecting kettle 2 and the lower kettle body 3. The jacket 7 on the upper kettle body 1 and the outer wall of the upper kettle body 1, the jacket 7 on the connecting kettle 2 and the outer wall of the connecting kettle 2, and the jacket 7 on the lower kettle body 3 and the outer wall of the lower kettle body 3 all form a condensation chamber 70. The jacket 7 is provided with a first liquid inlet pipe 71 for inputting the condensing medium into the condensing chamber 70, and a first liquid outlet pipe 72 for discharging the condensing medium in the condensing chamber 70. A butt heat exchange flange 8 is provided between the intermediate kettle body and the upper kettle body 1, and between each connecting kettle 2, which can increase the heat exchange area and can slide and guide the crystals after condensation. The butt heat exchange flange 8 is funnel-shaped, and a heat exchange cavity 80 for containing condensed medium is provided in the butt heat exchange flange 8. A second liquid inlet pipe 81 for inputting condensed medium into the inner cavity of the butt heat exchange flange 8 and a second liquid outlet pipe 82 for discharging the condensed medium in the inner cavity of the butt heat exchange flange 8 are provided on the butt heat exchange flange 8. The upper end of the middle kettle body is sealed and connected to the upper kettle body 1 through the butt heat exchange flange 8, and is fixedly connected to the upper kettle body 1 through a locking piece. Each connected kettle 2 is also sealed and connected through the butt heat exchange flange 8 and fixed by a locking piece. The lower end of the middle kettle body is sealed and connected to the lower kettle body 3 and fixed by a locking piece.

[0027] By injecting condensing medium into the condensing chamber 70, the upper kettle body 1, each connecting kettle 2 and the lower kettle body 3 are transformed into a series of continuously arranged heat exchange chambers. In the process that the feed input from the feed pipe 11 sequentially enters the upper kettle body 1, each connecting kettle 2 and the lower kettle body 3, continuous heat exchange is performed for multiple times, thereby greatly improving the precipitation rate of crystals in the feed. At the same time, by providing a docking heat exchange flange 8 and setting the docking heat exchange flange 8 into a funnel shape, the overall heat exchange area in the upper kettle body 1, each connecting kettle 2 and the lower kettle body 3 is increased. By increasing the heat exchange area, the efficiency of heat exchange for the feed is greatly improved, and the precipitation rate of crystals in the feed is further improved. At the same time, the crystallization kettle is provided with an upper kettle body 1, a lower kettle body 3 and a middle kettle body, wherein the size of the middle kettle body can be adaptively increased or decreased according to the actual use environment and use scene, which can effectively ensure the continuous heat exchange crystallization of the feed in the crystallization kettle, and effectively solve the problem of poor compatibility in the prior art and affecting the overall transportation and installation and disassembly, and has good adjustability and compatibility; A plurality of connecting legs 12 are provided on the outer wall of the upper kettle body 1 and are distributed along the circumference of the axis of the upper kettle body 1. The entire crystallization kettle is fixedly connected to the external frame through the connecting legs 12, thereby ensuring the overall stability of the crystallization kettle. The butt heat exchange flange 8 between the upper kettle body 1 and the connecting kettle 2 closest to the upper kettle body 1 is arranged between the upper kettle body 1 and the diaphragm frame 9 of the connecting kettle 2, and the butt heat exchange flanges 8 between each connecting kettle 2 are arranged between the diaphragm frames 9 in each connecting kettle 2, thereby effectively avoiding interference between the diaphragm frame 9 and the butt heat exchange flange 8 during rotation.

[0028] The diaphragm frame 9 includes a first connecting sleeve 901 and a second connecting sleeve 902 detachably mounted on the drive shaft 10, and side frames symmetrically arranged on both sides of the first connecting sleeve 901 along the axis of the first connecting sleeve 901, the first connecting sleeve 901 and the second connecting sleeve 902 are both coaxially arranged with the drive shaft 10, and the side frame includes an upper diaphragm plate 91 integrally formed with the first connecting sleeve 901, a lower diaphragm plate 93 integrally formed with the second connecting sleeve 902, and a side diaphragm plate 92 for connecting the upper diaphragm plate 91 and the lower diaphragm plate 93, each side diaphragm plate 92 is provided with a plurality of side scraper groups for scraping off frost or crystallization on the inner wall of the upper kettle body 1 or the inner wall of the connecting kettle 2 or the inner wall of the lower kettle body 3, the side scraper groups on each side diaphragm plate 92 are centrally symmetrically arranged, and each side scraper group includes a plurality of side scrapers 95, each side scraper 95 on the side diaphragm plate 92 on one side of the drive shaft 10 is connected to the side scraper 95 on the other side of the drive shaft 10 The side scrapers 95 on the membrane plate 92 are arranged in a staggered manner, and each lower membrane plate 93 is provided with a lower scraper group that can scrape off the frost and crystals on the upper end surface of the butt heat exchange flange 8. The lower scraper groups on each lower membrane plate 93 are arranged symmetrically. The lower scraper group includes a plurality of lower scrapers 96. The lower scrapers 96 on the lower membrane plate 93 on one side of the drive shaft 10 are arranged in a staggered manner with the lower scrapers 96 on the lower membrane plate 93 on the other side of the drive shaft 10. Each upper membrane plate 91 is provided with an upper scraper group for scraping off frost and crystallization on the lower end surface of the docking heat exchange flange 8. The upper scraper groups on each upper membrane plate 91 are arranged in a centrally symmetrical manner. The upper scrapers 94 on the upper membrane plate 91 on one side of the drive shaft 10 are staggered with the upper scrapers 94 on the upper membrane plate 91 on the other side of the drive shaft 10. The upper scrapers 94 on the side frame, the side scrapers 95, and the side scrapers 95 are arranged on the same side of the side frame.

[0029] Each side scraper 95, each upper scraper 94 and each lower scraper 96 are polytetrafluoroethylene scrapers; The drive shaft 10 is provided with a first wedge-shaped connecting block 101 adapted to the first connecting sleeve 901, and a second wedge-shaped connecting block 102 adapted to the second connecting sleeve 902. The first connecting sleeve 901 is provided with a first wedge-shaped through hole 903, and the second connecting sleeve 902 is provided with a second wedge-shaped through hole 904. The first connecting sleeve 901 is connected to the drive shaft 10 through the cooperation between the first wedge-shaped through hole 903 and the first wedge-shaped connecting block 101, and is fixed to the drive shaft 10 through a locking piece. The second connecting sleeve 902 is connected to the drive shaft 10 through the cooperation between the second wedge-shaped through hole 904 and the second wedge-shaped connecting block 102, and is fixed to the drive shaft 10 through a locking piece. The diaphragm frame 9 is fixedly connected to the drive shaft 10 through the cooperation between the first connecting sleeve 901 and the drive shaft 10, and the cooperation between the second connecting sleeve 902 and the drive shaft 10.

[0030] Each of the first wedge-shaped connecting block 101 and the second wedge-shaped connecting block 102 is provided with an external thread, and the first wedge-shaped connecting block 101 and the second wedge-shaped connecting block 102 are equipped with a locking nut. The first connecting sleeve 901 is positioned and pressed against the first wedge-shaped connecting block 101 through the first wedge-shaped through hole 903 and the plug-in fit with the first wedge-shaped connecting block 101, and is fixed to the drive shaft 10 through the lock nut and the external thread. The second connecting sleeve 902 is positioned and pressed against the second wedge-shaped connecting block 102 through the second wedge-shaped through hole 904 and the plug-in fit with the second wedge-shaped connecting block 102, and is fixed to the drive shaft 10 through the lock nut and the external thread.

[0031] Each upper scraper 94, each side scraper 95 and each lower scraper 96 includes a mounting seat 905, a connecting plate body 906 rotatably connected to the mounting seat 905, and a scraper portion 907 detachably mounted on the connecting plate body 906, wherein a scraping inclined surface 9071 is provided on the scraper portion 907 away from the connecting plate body 906, and the scraper portion 907 extends from one side of the connecting plate body 906 to the other side of the connecting plate body 906, and a connecting slot 908 is provided on the connecting plate body 906, wherein the width of the slot on the connecting slot 908 is smaller than the width of the slot bottom, and the connecting slot 908 extends from one side of the connecting plate body 906 to the other side of the connecting plate body 906. Extending to the other side of the connecting plate body 906, the scraper part 907 is provided with an insert plate body 909 integrally formed with the scraper part 907, the insert plate body 909 extends from one side of the scraper part 907 to the other side of the scraper part 907, the scraper part 907 is connected to the connecting plate body 906 through the cooperation of the insert plate body 909 and the connecting slot 908, and is fixedly installed on the rotating plate body through a locking piece, each connecting plate body 906 is limited and pressed against the side frame during the rotation of the driving shaft 10, and each scraper part 907 forms a line contact with the inner wall of the connecting kettle 2, the inner wall of the lower kettle body 3, and the upper end face and lower end face of the docking heat exchange flange 8.

[0032] By setting the width of the notch on the connection slot 908 to be smaller than the width of the slot bottom, the connection slot 908 is formed into a wedge shape, and the scraper part 907 is detachably fixedly connected by plugging with the plug plate body 909. During the installation of the scraper part 907, the operator can only insert the plug plate body 909 into the connection slot 908 from the side, and then the locking screw passes through the through hole on the plug plate body 909 and cooperates with the locking nut to fix the scraper part 907, thereby ensuring the stability and firmness of the connection between the scraper body and the connection plate body 906, and also preventing the scraper part 907 from being separated from the connection plate body 906. The butt heat exchange flange 8 includes a heat exchange flange portion 83, and a heat exchange portion 84 integrally formed with the heat exchange flange portion 83 and in a funnel shape. Each heat exchange portion 84 is provided with an inner hole for the drive shaft 10 to pass through. The heat exchange cavity 80 is arranged in the heat exchange portion 84, and the heat exchange cavity 80 is annular. The second liquid inlet pipe 81 passes through the heat exchange flange portion 83 and communicates with the heat exchange cavity 80. The second liquid outlet pipe 82 passes through the heat exchange flange portion 83 and communicates with the heat exchange cavity 80. The heat exchange cavity 80 is provided with an annular first partition plate 86 and a second partition plate 87. The first partition plate 86 and the second partition plate 87 are both coaxially arranged with the drive shaft 10, and The diameter of the second partition plate 87 is greater than that of the first partition plate 86. The heat exchange chamber 80 is divided into a first heat exchange chamber 801, a second heat exchange chamber 802 and a third heat exchange chamber 803 by the first partition plate 86 and the second partition plate 87. The first partition plate 86 is provided with a plurality of diverter holes 88 distributed circumferentially along the axis of the drive shaft 10 on the first partition plate 86. The second partition plate 87 is also provided with a plurality of diverter holes 88 distributed circumferentially along the axis of the drive shaft 10 on the second partition plate 87. The first heat exchange chamber 801, the second heat exchange chamber 802 and the third heat exchange chamber 803 are connected through each diverter hole 88.

[0033] Setting the heat exchange part 84 into a funnel shape can, on the one hand, increase the overall heat exchange area, and on the other hand, by setting the heat exchange part 84, the crystals in the upper kettle body 1 are guided to the middle kettle body, and the crystals in the middle kettle body are guided to the lower kettle body 3, thereby ensuring the high efficiency and precipitation rate of crystallization, and also ensuring the continuity of cooling crystallization in the crystallization kettle.

[0034] The second liquid inlet pipe 81 is connected to an injection pipe 85, which is fixed on the first partition plate 86 and the second partition plate 87. One end of the injection pipe 85 is connected to the second liquid inlet pipe 81, and the other end of the injection pipe 85 passes through the second partition plate 87 and the first partition plate 86 and extends into the first heat exchange chamber 801 and is connected to the first heat exchange chamber 801.

[0035] An injection pipe 85 is provided on the second liquid inlet pipe 81, and the condensing medium is injected into the first heat exchange chamber 801 by providing the liquid inlet pipe. The condensing medium in the first heat exchange chamber 801 then enters the second heat exchange chamber 802 and the third heat exchange chamber 803 in sequence through the diversion hole. The condensing medium first enters the first heat exchange chamber 801 for heat exchange, and then enters the second heat exchange chamber 802 and the third heat exchange chamber 803 for heat exchange treatment. On the one hand, after the condensing medium is introduced into the first heat exchange chamber 801 for heat exchange, the condensing medium after heat exchange can be partially heat exchanged from the second heat exchange chamber 802 and the third heat exchange chamber 803, and after the heat exchange in the first heat exchange chamber 801 is completed, the condensing medium continuously injected into the pipe enters the second heat exchange chamber 801 and then enters the first heat exchange chamber 801. 802, after the heat exchange in the second heat exchange chamber 802 is completed, the heat exchange in the third heat exchange chamber 803 is carried out, and after the heat exchange in the second heat exchange chamber 802 is completed, the condensing medium enters the third heat exchange chamber 803. On the one hand, it can ensure that the condensing medium can fully and efficiently perform heat exchange treatment on the heat exchange chamber 80, thereby improving the heat exchange efficiency. On the other hand, the heat exchange chamber 80 is not separated and is not injected from the bottom. After the condensing medium enters the second liquid inlet pipe 81, it is discharged from the second liquid outlet pipe 82 after partial heat exchange. Not only can the comprehensive heat exchange not be achieved, but the condensing medium cannot be fully utilized. Therefore, by separating and injecting from the first heat exchange chamber 801, the efficiency can be improved while the utilization rate of the condensing medium can be improved.

[0036] The diaphragm frame 9 includes a first connecting sleeve 901 and a second connecting sleeve 902 detachably mounted on the drive shaft 10, and side frames symmetrically arranged on both sides of the first connecting sleeve 901 along the axis of the first connecting sleeve 901, the first connecting sleeve 901 and the second connecting sleeve 902 are both coaxially arranged with the drive shaft 10, and the side frames include an upper diaphragm plate 91 integrally formed with the first connecting sleeve 901, a lower diaphragm plate 91 integrally formed with the second connecting sleeve 902, and a lower diaphragm plate 91 integrally formed with the second connecting sleeve 902. The diaphragm plate 93 and the side diaphragm plate 92 used to connect the upper diaphragm plate 91 and the lower diaphragm plate 93, and the upper diaphragm plate 91 of each connected kettle 2 are provided with a positioning plate 97, and the positioning plate 97 is provided with a side pressure plate 98, and the side scraping groove 99 on the side pressure plate 98, the side scraping groove 99 of the side pressure plate 98 is pressed against the hole wall of the inner hole of the heat exchange part 84, and the side scraping groove 99 on the side pressure plate 98 scrapes off the frost and crystallization on the hole wall of the inner hole of the heat exchange part 84 through the rotation of the diaphragm frame 9.

[0037] The bottom end of the heat exchange portion 84 is in an arc shape, and the side scraping groove 99 on the side pressure plate 98 is in contact with the bottom end of the heat exchange portion 84. The upper scrapers 94 and the lower scrapers 96 can only scrape the frost and crystals on the upper and lower end surfaces of the heat exchange portion 84, and the bottom end of the heat exchange portion 84 belongs to the blind area of ​​the heat exchange portion 84. The side pressure plate 98 and the side scraping groove 99 are provided. On the one hand, during the rotation of the diaphragm frame 9, the crystals and frost generated at the bottom end of the heat exchange portion 84 can be scraped out. On the other hand, when the diaphragm frame 9 is not rotating, the side scrapers 95 can also support the heat exchange portion 84, thereby ensuring the stability of the heat exchange portion 84.

[0038] The upper kettle body 1 is provided with a first flange portion 13, the upper end of each connected kettle 2 is provided with a second flange portion 21, the lower end of each connected kettle 2 is provided with a third flange portion 22, and the lower kettle body 3 is provided with a fourth flange portion 31. The first flange portion 13, the second flange portion 21, the third flange portion 22, the fourth flange portion 31, and the upper and lower end surfaces of the heat exchange flange portion 83 are provided with connecting bosses, and each connecting boss is coaxially arranged with the drive shaft 10. The connecting bosses on the first flange portion 13, the second flange portion 21 and the third flange portion 22 are provided with connecting ring grooves a coaxially arranged with the connecting bosses, and the upper and lower end surfaces of the heat exchange flange portion 83 and the fourth flange portion 31 are provided with connecting convex rings b coaxially arranged with the connecting bosses. The upper ends of the upper kettle body 1 and the middle kettle body are connected to the connecting bosses on the first flange portion 13 through the connecting convex ring b on the upper end surface of the heat exchange flange portion 83. The plug-in fit of the connecting ring groove a, and the plug-in fit of the connecting convex ring b on the lower end surface of the heat exchange flange part 83 and the connecting ring groove a on the second flange part 21 closest to the upper kettle body 1 are sealed and connected to the butt heat exchange flange 8, and fixed by a locking piece. Each adjacent connecting kettle 2 is sealed and connected to the butt heat exchange flange 8 through the plug-in fit of the connecting ring groove a on the third flange part 22 and the connecting convex ring b on the upper end surface of the heat exchange flange part 83, and the connecting convex ring b on the lower end surface of the heat exchange flange part 83 and the connecting ring groove a on the second flange part 21 on the adjacent connecting kettle 2, and fixed by a locking piece. The lower kettle body 3 is sealed and connected to the connecting kettle 2 closest to the lower kettle body 3 through the plug-in fit of the connecting convex ring b on the fourth flange part 31 and the connecting ring groove a on the third flange part 22 on the connecting kettle 2 closest to the lower kettle body 3, and fixedly connected by a locking piece.

[0039] In order to ensure the sealing performance, a sealing ring coaxially arranged with the connecting ring groove a can be arranged in each connecting ring groove a, thereby ensuring the overall sealing performance after the connecting convex ring b is connected to the connecting ring groove a.

[0040] A connecting bottom plate 14 is provided on the upper kettle body 1, a connecting bracket 5 is fixedly provided on the connecting bottom plate 14, the connecting bottom plate 14 is sealedly connected to the upper kettle body 1 and the connecting bracket 5, the driving motor 6 is fixedly installed on the connecting bracket 5, a transmission shaft 52 coaxially arranged with the driving shaft 10 is fixedly provided at the output end of the driving motor 6, a bearing seat 53 is fixedly provided in the connecting bracket 5, a plurality of transmission bearings 54 coaxially arranged with the transmission shaft 52 are provided in the bearing seat 53, each transmission bearing 54 on the bearing seat 53 is sleeved on the transmission shaft 52, a mechanical seal 55 coaxially arranged with the transmission shaft 52 is provided on the connecting bottom plate 13, the transmission shaft 52 is connected to the driving shaft 10 after passing through the mechanical seal 55, the connecting bottom plate 14 and the upper kettle body 1, a connecting flange is provided between the transmission shaft 52 and the driving shaft 10, and the transmission shaft 52 and the driving shaft 10 are connected through the connecting flange.

[0041] Filter plates 51 are installed on the front and rear end surfaces of the connecting bracket 5 to dissipate heat and prevent dust.

[0042] A discharging kettle 4 which is coaxially arranged and connected with the lower kettle 3 is provided at the bottom of the lower kettle body 3, and a connected aeration pipe 42 is provided on the side wall of the discharging kettle 4. The aeration pipe 42 can prevent crystallization from clogging each pipeline, thereby playing a role in unblocking the pipeline. One end of the driving shaft 10 is connected to the transmission shaft 52 through a connecting flange, and the other end of the driving shaft 10 is rotatably connected in the discharging kettle 4. The discharging pipe 41 is arranged on the discharging kettle 4 and connected with the discharging kettle 4. The discharging pipe 41 is arranged at the bottom of the discharging kettle 4. A diaphragm frame 9 is also provided in the discharging kettle 4. The diaphragm frame 9 rotates in the discharging kettle 4 and stirs the feed through the driving of the transmission shaft 52 by the driving motor 6 and the connection between the transmission shaft 52 and the driving shaft 10.

[0043] Working principle of the present invention: During use, the present invention fixes the connecting bracket 5 on the upper kettle body 1, and the driving motor 6 is installed on the connecting bracket 5. The driving motor 6 transmits the drive shaft 10 through the transmission shaft 52. Then, according to the specific use environment and use scenario, different numbers of connecting kettles 2 are selected. After determining the number of connecting kettles 2, the diaphragm frame 9 in the upper kettle body 1 is installed first. During the installation process, the first connecting shaft sleeve 901 is connected to the driving shaft 10 through the first wedge-shaped through hole 903 and the first wedge-shaped connecting block 101, and is fixed to the driving shaft 10 through a locking piece. The second connecting shaft sleeve 902 is connected to the driving shaft 10 through the second wedge-shaped through hole 904 and the second wedge-shaped connecting block 102, and is fixed to the driving shaft 10 through a locking piece. The wedge-shaped cooperation between the connecting block 101 and the first wedge-shaped through hole 903, as well as the wedge-shaped cooperation between the second wedge-shaped connecting block 102 and the second wedge-shaped through hole 904, ensure the firmness of the connection between the first connecting sleeve 901 and the second connecting sleeve 902 and the drive shaft 10, and the diameter of the upper end surface of the first wedge-shaped connecting block 101 and the second wedge-shaped connecting block 102 is smaller than the diameter of the lower end surface. Therefore, during use, the first connecting sleeve 901 and the second connecting sleeve 902 will be pressed more tightly against the first wedge-shaped connecting block 101 and the second wedge-shaped connecting block 102 as they move downward, and the stability of the diaphragm frame 9 on the drive shaft 10 is ensured after being fixed by the locking piece. At this time, the side scraper 95 on the diaphragm frame 9 in the upper kettle body 1 is pressed against the inner wall of the upper kettle body 1, and then each docking heat exchange flange 8 and the connecting kettle 2 are installed; During the process of installing and connecting the connecting body closest to the upper kettle body 1 with the upper kettle body 1, the lower end of the upper kettle body 1 and the butt heat exchange flange 8 are sealed and connected by plugging and matching the connecting convex ring b on the upper end surface of the heat exchange flange part 83 with the connecting ring groove a on the first flange part 13, and the connecting convex ring b on the lower end surface of the heat exchange flange part 83 with the connecting ring groove a on the second flange part 21 closest to the upper kettle body 1, and fixed by a locking piece, thereby ensuring a stable, firm and sealed connection between the upper kettle body 1 and the connecting kettle 2, and then the diaphragm frame 9 in the connecting kettle 2 is installed on the driving shaft 10; Then, the butt heat exchange flange 8, the connecting kettle 2 and the diaphragm frame 9 are installed in sequence. During the installation of each connecting kettle 2, each adjacent connecting kettle 2 is sealed and connected to the butt heat exchange flange 8 through the plug-in fit of the connecting ring groove a on the third flange portion 22 and the connecting convex ring b on the upper end face of the heat exchange flange portion 83, and the connecting convex ring b on the lower end face of the heat exchange flange portion 83 cooperates with the connecting ring groove a on the second flange portion 21 on the adjacent connecting kettle 2, and is fixed by a locking piece. After the connecting kettle 2 and the diaphragm frame 9 closest to the lower kettle body 3 are installed, in the process of connecting the connecting kettle 2 to the lower kettle body 3, the lower kettle body 3 is sealed and connected to the connecting kettle 2 closest to the lower kettle body 3 through the plug-in fit of the connecting convex ring b on the fourth flange portion 31 and the connecting ring groove a on the third flange portion 22 on the connecting kettle 2 closest to the lower kettle body 3, and is fixedly connected by a locking piece. Each side scraper 95 on the diaphragm frame 9 in the upper kettle body 1 is pressed against the inner wall of the upper kettle body 1, and each lower scraper 96 is pressed against the upper end surface of the butt heat exchange flange 8 between the upper kettle body 1 and the connecting kettle 2. Each upper scraper 94 on the diaphragm frame in each connecting kettle 2 is pressed against the lower end surface of the corresponding butt heat exchange flange 8. Each side scraper 95 is pressed against the inner wall of each connecting kettle 2, and each lower scraper 96 is pressed against the upper end surface of the corresponding butt heat exchange flange 8. The side scraping groove 99 of the side pressure plate 98 on the upper diaphragm plate 91 in the connecting kettle 2 scrapes off the frost and crystals on the hole wall of the inner hole of the heat exchange part 84 through the rotation of the diaphragm frame 9. After the lowest connecting kettle 2 in each connecting kettle 2 is installed and connected with the lower kettle body 3, the side scrapers 95 on the diaphragm frame 9 located in the connecting kettle 2 and the lower kettle body 3 are driven by the drive shaft 10 to scrape off the frost and crystals on the inner wall of the connecting kettle 2 and the inner wall of the lower kettle body 3. After the crystallization kettle is installed, heat exchange medium is injected into each condensation chamber 70 and heat exchange chamber 80, and the drive shaft 10 is driven by the drive motor 6 to rotate, and the diaphragm frames 9 on the drive shaft 10 are driven to rotate, and then the feed is fed through the feed pipe 11, and the feed first enters the upper kettle body 1 for stirring and heat exchange, and the crystals and frost on the inner wall of the upper kettle body 1 and the crystals and frost on the upper end surface of the corresponding docking heat exchange flange 8 are scraped off by the side scrapers 95 and the lower scraper 96 on the diaphragm frame 9, and are guided to the middle kettle body through the heat exchange part 84 on the docking heat exchange flange 8, and the upper scrapers 94 on the diaphragm frames 9 in each middle kettle body are scraped off. The crystals and frost are scraped off the lower end surface of the corresponding butt heat exchange flange 8 above, and each side scraper 95 scrapes off the frost and crystals on the inner wall of the corresponding connecting kettle 2 through the rotation of the diaphragm frame 9. Each lower scraper 96 scrapes off the crystals and frost on the upper end surface of the corresponding butt heat exchange flange 8 below through the rotation of the diaphragm frame 9. The hole wall of the inner hole on each butt heat exchange flange 8 is scraped off through the side scraping groove 99 on the side pressure plate 98. Each side scraper 95 on the diaphragm in the lower kettle body 3 scrapes off the frost and crystals on the inner wall of the connecting kettle 2 and the lower kettle body 3 through the drive shaft 10, and then the crystals are discharged from the discharge kettle 4. The present invention arranges the intermediate kettle body into a connection of multiple connecting kettles 2. The arrangement of the multiple connecting kettles 2 can be adjusted in size according to actual usage scenarios and usage requirements. At the same time, multiple docking heat exchange flanges 8 are arranged to ensure the continuity and efficiency of the feed and increase the overall heat exchange area. On the one hand, it can greatly improve the overall heat exchange efficiency and heat exchange speed, and on the other hand, it can also greatly improve the precipitation rate of crystals in the feed. The structure is ingenious and stable and practical.

[0044] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A membrane stack type continuous cooling crystallizer, having a crystallization kettle, characterized in that: The crystallization kettle comprises an upper kettle body connected to each other, a lower kettle body coaxially arranged with the upper kettle body, and an intermediate kettle body arranged between the upper kettle body and the lower kettle body, the intermediate kettle body comprises at least one connecting kettle coaxially arranged with the upper kettle body, the upper kettle body is provided with a feed pipe, the lower kettle body is provided with a discharge pipe, the upper kettle body is also provided with a drive motor, a drive shaft arranged in the crystallization kettle and rotatable under the drive of the drive motor is provided in the crystallization kettle, the drive shaft is coaxially arranged with the crystallization kettle, the upper kettle body, each connecting kettle and the lower kettle body are provided with a diaphragm frame for stirring the feed, each diaphragm frame is installed on the drive shaft and stirs the feed with the rotation of the drive shaft, the outer walls of the upper kettle body, each connecting kettle and the lower kettle body are provided with a jacket, the jacket on the upper kettle body and the outer wall of the upper kettle body, the jacket on the connecting kettle and the outer wall of the connecting kettle, and the jacket on the lower kettle body and the outer wall of the lower kettle body form A condensation chamber, the jacket is provided with a first liquid inlet pipe for inputting condensation medium into the condensation chamber, and a first liquid outlet pipe for discharging the condensation medium in the condensation chamber, a butt heat exchange flange for increasing the heat exchange area and for slidingly guiding the crystals after condensation is provided between the middle kettle body and the upper kettle body, and between each connecting kettle, the butt heat exchange flange is funnel-shaped, and a heat exchange chamber for containing condensation medium is provided in the butt heat exchange flange, a second liquid inlet pipe for inputting condensation medium into the inner cavity of the butt heat exchange flange, and a second liquid outlet pipe for discharging the condensation medium in the inner cavity of the butt heat exchange flange are provided on the butt heat exchange flange, the upper end of the middle kettle body is sealedly connected to the upper kettle body through the butt heat exchange flange, and is fixedly connected to the upper kettle body through a locking piece, each connecting kettle is also sealedly connected through the butt heat exchange flange and fixed by a locking piece, and the lower end of the middle kettle body is sealedly connected to the lower kettle body and fixed by a locking piece.

2. The membrane stack continuous cooling crystallizer according to claim 1, characterized in that: The diaphragm frame includes a first connecting shaft sleeve and a second connecting shaft sleeve that are detachably mounted on the drive shaft, and side frames that are symmetrically arranged on both sides of the first connecting shaft sleeve along the axis of the first connecting shaft sleeve, and the first connecting shaft sleeve and the second connecting shaft sleeve are both coaxially arranged with the drive shaft. The side frame includes an upper diaphragm plate integrally formed with the first connecting shaft sleeve, a lower diaphragm plate integrally formed with the second connecting shaft sleeve, and a side diaphragm plate for connecting the upper diaphragm plate and the lower diaphragm plate, each side diaphragm plate is provided with a plurality of side scraper groups that can scrape off frost or crystals on the inner wall of the upper kettle body or the inner wall of the connecting kettle or the inner wall of the lower kettle body, the side scraper groups on each side diaphragm plate are centrally symmetrically arranged, and each side scraper group includes a plurality of side scrapers, and each side scraper on the side diaphragm plate on one side of the drive shaft is aligned with each side scraper on the side diaphragm plate on the other side of the drive shaft The side scrapers are staggered, and each lower membrane plate is provided with a lower scraper group for scraping frost and crystallization on the upper end surface of the butt heat exchange flange, and each lower scraper group on each lower membrane plate is centrally symmetrically arranged. The lower scraper group includes multiple lower scrapers, and each lower scraper on the lower membrane plate on one side of the drive shaft is staggered with each lower scraper on the lower membrane plate on the other side of the drive shaft. Each upper membrane plate in each connecting kettle is provided with an upper scraper group for scraping frost and crystallization on the lower end surface of the butt heat exchange flange, and each upper scraper group on each upper membrane plate is centrally symmetrically arranged, and each upper scraper on the upper membrane plate on one side of the drive shaft is staggered with each upper scraper on the upper membrane plate on the other side of the drive shaft. Each upper scraper, each side scraper, and each side scraper on the side frame are arranged on the same side of the side frame.

3. The membrane stack continuous cooling crystallizer according to claim 2, characterized in that: The drive shaft is provided with a first wedge-shaped connecting block adapted to the first connecting sleeve, and a second wedge-shaped connecting block adapted to the second connecting sleeve. The first connecting sleeve is provided with a first wedge-shaped through hole, and the second connecting sleeve is provided with a second wedge-shaped through hole. The first connecting sleeve is connected to the drive shaft through the cooperation between the first wedge-shaped through hole and the first wedge-shaped connecting block, and is fixed to the drive shaft through a locking piece. The second connecting sleeve is connected to the drive shaft through the cooperation between the second wedge-shaped through hole and the second wedge-shaped connecting block, and is fixed to the drive shaft through a locking piece. The diaphragm frame is fixedly connected to the drive shaft through the cooperation between the first connecting sleeve and the drive shaft, and the cooperation between the second connecting sleeve and the drive shaft.

4. The membrane stack continuous cooling crystallizer according to claim 3, characterized in that: The cam is an angular channel formed between a pair of cam faces and a pair of cams, each of which is adapted to move along the cam face, the cam being able to move relative to the cam face when the cam face is moving.

5. The membrane stack continuous cooling crystallizer according to claim 1, characterized in that: The butt heat exchange flange includes a heat exchange flange portion, and a heat exchange portion integrally formed with the heat exchange flange portion and in a funnel shape, each heat exchange portion is provided with an inner hole for the drive shaft to pass through, the heat exchange chamber is arranged in the heat exchange portion, and the heat exchange chamber is annular, the second liquid inlet pipe is connected with the heat exchange chamber after passing through the heat exchange flange portion, and the second liquid outlet pipe is connected with the heat exchange chamber after passing through the heat exchange flange portion, the heat exchange chamber is provided with an annular first partition plate and a second partition plate, the first partition plate and the second partition plate are both coaxially arranged with the drive shaft, and the diameter of the second partition plate is larger than the diameter of the first partition plate, the heat exchange chamber is divided into a first heat exchange chamber, a second heat exchange chamber and a third heat exchange chamber by the first partition plate and the second partition plate, the first partition plate is provided with a plurality of diversion holes distributed on the first partition plate along the circumference of the axis of the drive shaft, the second partition plate is also provided with a plurality of diversion holes distributed on the second partition plate along the circumference of the axis of the drive shaft, the first heat exchange chamber, the second heat exchange chamber and the third heat exchange chamber are connected through each diversion hole.

6. The membrane stack continuous cooling crystallizer according to claim 5, characterized in that: The second liquid inlet pipe is connected to an injection pipe, which is fixed on the first partition plate and the second partition plate. One end of the injection pipe is connected to the second liquid inlet pipe, and the other end of the injection pipe passes through the second partition plate and the first partition plate and extends into the first heat exchange chamber and is connected to the first heat exchange chamber.

7. The membrane stack continuous cooling crystallizer according to claim 6, characterized in that: The diaphragm frame includes a first connecting sleeve and a second connecting sleeve detachably mounted on the drive shaft, and side frames symmetrically arranged on both sides of the first connecting sleeve along the axis of the first connecting sleeve, the first connecting sleeve and the second connecting sleeve are both coaxially arranged with the drive shaft, and the side frame includes an upper diaphragm plate integrally formed with the first connecting sleeve, a lower diaphragm plate integrally formed with the second connecting sleeve, and a side diaphragm plate for connecting the upper diaphragm plate and the lower diaphragm plate, and a positioning plate is provided on the upper diaphragm plate of each connecting kettle, and a side pressure plate is provided on the positioning plate, and a side scraping groove on the side pressure plate, the side scraping groove of the side pressure plate is pressed against the hole wall of the inner hole of the heat exchange part, and the side scraping groove on the side pressure plate scrapes off frost and crystallization on the hole wall of the inner hole of the heat exchange part through the rotation of the diaphragm frame.

8. The membrane stack continuous cooling crystallizer according to claim 7, characterized in that: The upper kettle body is provided with a first flange portion, the upper end of each connected kettle is provided with a second flange portion, the lower end of each connected kettle is provided with a third flange portion, the lower kettle body is provided with a fourth flange portion, the first flange portion, the second flange portion, the third flange portion, the fourth flange portion, and the upper and lower end surfaces of the heat exchange flange portion are all provided with connecting bosses, and each connecting boss is coaxially arranged with the drive shaft, and the connecting bosses on the first flange portion, the second flange portion and the third flange portion are all provided with connecting ring grooves coaxially arranged with the connecting bosses, and the upper end surface and the lower end surface of the heat exchange flange portion, as well as the fourth flange portion, are provided with connecting convex rings coaxially arranged with the connecting bosses, and the upper ends of the upper kettle body and the middle kettle body are connected by connecting convex rings on the upper end surfaces of the heat exchange flange portions and the connecting ring grooves on the first flange portions. The plug-in fit, as well as the plug-in fit of the connecting convex ring on the lower end surface of the heat exchange flange and the connecting ring groove on the second flange portion closest to the upper kettle body, are sealed and connected to the butt heat exchange flange and fixed by a locking piece. Each adjacent connecting kettle is sealed and connected to the butt heat exchange flange through the plug-in fit of the connecting ring groove on the third flange portion and the connecting convex ring on the upper end surface of the heat exchange flange portion, as well as the connection convex ring on the lower end surface of the heat exchange flange portion and the connecting ring groove on the second flange portion of the adjacent connecting kettle, and fixed by a locking piece. The lower kettle body is sealed and connected to the connecting kettle closest to the lower kettle body through the plug-in fit of the connecting convex ring on the fourth flange portion and the connecting ring groove on the third flange portion of the connecting kettle closest to the lower kettle body, and is fixedly connected by a locking piece.

9. The membrane stack continuous cooling crystallizer according to claim 2, characterized in that: The upper kettle body is provided with a connecting bottom plate, a connecting bracket is fixedly provided on the connecting bottom plate, the driving motor is fixedly installed on the connecting bracket, a transmission shaft coaxially arranged with the driving shaft is fixedly provided at the output end of the driving motor, a bearing seat is fixedly provided in the connecting bracket, a plurality of transmission bearings coaxially arranged with the transmission shaft are provided in the bearing seat, each transmission bearing on the bearing seat is sleeved on the transmission shaft, a mechanical seal coaxially arranged with the transmission shaft is provided on the connecting bottom plate, the transmission shaft is connected to the driving shaft after passing through the mechanical seal, the connecting bottom plate and the upper kettle body, a connecting flange is provided between the transmission shaft and the driving shaft, and the transmission shaft and the driving shaft are connected through the connecting flange.

10. The membrane stack continuous cooling crystallizer according to claim 9, characterized in that: A discharging kettle coaxially arranged and connected with the lower kettle is provided at the bottom of the lower kettle body, a connected aeration pipe is provided on the side wall of the discharging kettle, one end of the driving shaft is connected with the transmission shaft through a connecting flange, and the other end of the driving shaft is rotatably connected in the discharging kettle, the discharging pipe is arranged on the discharging kettle and connected with the discharging kettle, the discharging pipe is arranged at the bottom of the discharging kettle, and a diaphragm frame is also provided in the discharging kettle, and the diaphragm frame rotates in the discharging kettle and stirs the feed through the driving of the transmission shaft by the driving motor and the connection between the transmission shaft and the driving shaft.

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