Internal circulation esterification kettle

Abstract

The invention relates to the technical field of chemical equipment, in particular to an internal circulation esterification kettle which comprises a kettle body, a circulation stirring assembly, a driving assembly and a scraping assembly. A reaction cavity is formed in the kettle body; the circulating stirring assembly comprises a separation cylinder, a rotating shaft, a first paddle and a driving part; a circulation cavity is formed between the outer wall of the separation cylinder and the inner wall of the kettle body; the first paddle is arranged on the rotating shaft; the driving part is used for driving the rotating shaft to rotate; when the rotating shaft rotates, the first paddle can push materials from the first end of the separation barrel to the second end of the separation barrel, and then the materials flow back to the first end through the circulation cavity; the driving assembly comprises a first gear, a gear ring, a mounting frame and a second gear which form a planetary gear train; the scraping assembly comprises a reciprocating lead screw, a guide rod and a scraping plate, and when the rotating shaft rotates, the scraping plate can rotate by taking the central axis of the rotating shaft as the center and slide up and down along the inner wall of the kettle body in a reciprocating manner. The reaction kettle has the effects of improving the material mixing efficiency and uniformity and reducing adhesion between materials and the inner wall of the reaction kettle.

Description

Technical Field

[0001] The present application relates to the technical field of chemical equipment, and in particular to an internal circulation esterification kettle. Background Art

[0002] Esterification is a type of organic chemical reaction, mainly the reaction of alcohol with carboxylic acid or inorganic oxygen-containing acid to generate ester and water. When using the existing esterification reactor, the alcohol and acid are usually injected into the reactor at one time, and then the raw materials are heated and stirred to promote the reaction. Therefore, material stirring is an extremely important step in the esterification reaction. This step is to complete the full mixing of materials in the esterification reactor, prepare for the subsequent esterification reaction, improve production efficiency, and ensure the product yield.

[0003] The stirring paddle of the traditional esterification reactor is set in the middle of the reactor. The stirring paddle rotates to form a vortex with the material and presses the material to the bottom of the reactor. However, in the process of pressing the upper material to the bottom of the reactor, it will be squeezed with the material flowing upward from the bottom of the reactor, so that the material still maintains each layer relatively stably, resulting in low material circulation efficiency and increased energy consumption of the agitator. In addition, due to the certain viscosity of the material during stirring, the material close to the inner wall of the reactor will have an adhesion effect with the reactor, the material close to the stirring paddle has a fast flow rate, and the material close to the inner wall of the reactor has a slow flow rate, which further aggravates the problem of uneven material mixing. Summary of the invention

[0004] In order to improve the efficiency and uniformity of material mixing and reduce the adhesion of materials to the inner wall of the reactor, the present application provides an internal circulation esterification reactor.

[0005] The internal circulation esterification kettle provided in this application adopts the following technical solution: An internal circulation esterification kettle, comprising: A kettle body, wherein a reaction chamber for heating and reacting materials is provided in the kettle body, and the reaction chamber is cylindrical; A circulating stirring assembly, the circulating stirring assembly comprising a separation cylinder, a rotating shaft, a first paddle and a driving member; the separation cylinder is arranged in a reaction chamber, both ends of the separation cylinder are connected to the reaction chamber, and a flow chamber is formed between the outer wall of the separation cylinder and the inner wall of the kettle body; the rotating shaft is rotatably arranged on the kettle body and one end extends into the separation cylinder, and the central axis of the rotating shaft is coaxial with the central axis of the reaction chamber; the first paddle is arranged on the rotating shaft and is located in the separation cylinder; the driving member is used to drive the rotating shaft to rotate; when the rotating shaft rotates, the first paddle can push the material from the first end of the separation cylinder to the second end of the separation cylinder and then flow back to the first end of the separation cylinder through the flow chamber; A driving assembly, the driving assembly comprising a first gear, a gear ring, a mounting frame and a second gear, the first gear being fixed on the rotating shaft and rotating together with the rotating shaft; the gear ring being arranged on the inner wall of the kettle body and being coaxial with the first gear; the mounting frame being rotatably arranged on the rotating shaft; the second gear being rotatably arranged on the mounting frame and meshing with the first gear and the gear ring to form a planetary gear system; A scraping assembly, the scraping assembly includes a reciprocating screw, a guide rod and a scraper, the reciprocating screw is arranged on the second gear and rotates coaxially with the second gear; the guide rod is arranged on the mounting frame and is parallel to the reciprocating screw; the scraper is slidably connected to the guide rod and is threadedly connected to the reciprocating screw, and one end of the scraper slides against the inner wall of the kettle body; when the rotating shaft rotates, the scraper can rotate around the central axis of the rotating shaft and slide back and forth up and down along the inner wall of the kettle body.

[0006] By adopting the above technical solution, the efficiency and uniformity of material mixing can be improved, and the adhesion of materials to the inner wall of the kettle body can be reduced. Specifically, when the first blade rotates, it can cause the material to form a vortex flow in the reactor, which not only completely disrupts the stratification of the material in the vertical direction, but also presses the material to the bottom of the kettle body, further destroying the stratification structure of the material in the horizontal direction, thereby achieving full mixing of the material in the horizontal and vertical directions; the design of the separation cylinder effectively avoids the direct collision of the upper material with the lower material when the upper material is squeezed downward, ensuring that the lower material can smoothly flow back to the upper layer through the circulation cavity, forming a stable circulation flow path, and greatly improving the circulation efficiency of the material; in addition, the drive assembly uses the rotation of the rotating shaft to drive the scraper to rotate around the rotating shaft as the center, and at the same time, combined with the action of the reciprocating screw and the guide rod, the scraper can also move back and forth up and down along the height direction of the kettle body during the rotation process, covering all corners of the inner wall of the kettle body in all directions. This design enables the scraper to efficiently remove the material adhering to the inner wall of the kettle body, thereby reducing the uneven mixing caused by material adhesion, and significantly improving the product yield and production efficiency.

[0007] Optionally, the circulating stirring assembly also includes a second paddle and a material baffle plate, the second paddle being arranged on the rotating shaft and located at the second end of the separating cylinder, the second paddle being capable of stirring the material flowing out from the second end of the separating cylinder and pushing it toward the inner wall of the kettle body; the material baffle plate being arranged on the inner wall of the kettle body and being used to cooperate with the second paddle to shear the material.

[0008] By adopting the above technical solution, the second paddle can further stir the material flowing out from the second end of the separation cylinder and push the material toward the inner wall of the kettle body, thereby increasing the flow path and mixing effect of the material in the reaction chamber, reducing the accumulation of the material at the second end of the separation cylinder, and improving the uniformity of the material. The baffle plate cooperates with the second paddle to form a shearing effect on the material, effectively reducing the stratification of the material, and further breaking the agglomeration of the material, improving the dispersion and fluidity of the material, thereby significantly improving the mixing efficiency and reaction quality of the material.

[0009] Optionally, it also includes a heating coil arranged in the circulation cavity for heating the material; the kettle body includes an inner kettle body and an outer kettle body; the outer kettle body is sleeved on the outside of the inner kettle body, and the reaction chamber is opened in the inner kettle body; an isolation chamber is formed between the inner wall of the inner kettle body and the outer wall of the outer kettle body, and a connecting hole connecting the reaction chamber and the isolation chamber is provided at the top of the inner kettle body, and the gas in the reaction chamber can enter the isolation chamber through the connecting hole.

[0010] By adopting the above technical solution, the heating coil can evenly heat the material flowing through the circulation cavity, promote the esterification reaction process of the material, and thus improve the reaction efficiency and product quality; the isolation cavity formed between the inner kettle body and the outer kettle body can effectively block the heat of the material in the reaction cavity from being transferred to the outer kettle body, thereby reducing heat loss and improving energy utilization. At the same time, the steam generated in the reaction cavity can enter the isolation cavity through the connecting hole, forming an insulation layer in the isolation cavity, further reducing heat loss, ensuring the temperature stability in the reaction cavity, and providing a more efficient thermal environment for the esterification reaction.

[0011] Optionally, a jacket is provided on the outer side of the kettle body; an insulation cavity for circulation of a heat-conducting medium is formed between the inner wall of the jacket and the outer wall of the kettle body, and a heat-conducting medium input port and a heat-conducting medium output port connected to the insulation cavity are provided on the jacket.

[0012] By adopting the above technical solution, the heat transfer medium flowing in the heat preservation chamber can effectively control the temperature of the material in the kettle, ensuring that the esterification reaction is carried out within a suitable temperature range. The setting of the heat transfer medium input port and the heat transfer medium output port facilitates the replacement and circulation of the heat transfer medium, improves the stability and efficiency of temperature control, and further optimizes the conditions of the esterification reaction.

[0013] Optionally, the scraping assembly also includes a transmission shaft, a third gear and a spiral blade; the transmission shaft is rotatably connected to the mounting frame, and the rotation axis of the transmission shaft is parallel to the rotation axis of the rotating shaft; the third gear is fixed to the transmission shaft and meshes with the second gear; the spiral blade is arranged on the transmission shaft and is located in the flow chamber, and the outer side of the spiral blade is in sliding contact with the outer wall of the separating cylinder; when the second gear rotates, it can drive the transmission shaft to rotate and enable the spiral blade to transport the material on the outside of the second end of the separating cylinder to the first end and scrape the material on the outer wall of the separating cylinder.

[0014] By adopting the above-mentioned technical solution, the rotation of the second gear can drive the third gear and the transmission shaft to rotate, and the spiral blades can transport the material on the outside of the second end of the separation cylinder to the first end as the transmission shaft rotates, effectively promoting the flow of materials in the circulation chamber and improving the uniformity of material mixing; at the same time, the spiral blades can also revolve around the central axis of the separation cylinder, and the design of the spiral blades slidingly abutting against the outer wall of the separation cylinder can scrape off the material attached to any position on the outer wall of the separation cylinder, reduce the adhesion of the material to the outer wall of the separation cylinder, and further avoid the problem of uneven mixing caused by material adhesion.

[0015] Optionally, the rotation direction of the spiral blade is the same as the rotation direction of the third gear.

[0016] By adopting the above technical solution, the conveying efficiency of the spiral blades on the materials can be improved, the scattering of the materials due to the centrifugal force of the rotating spiral blades can be reduced, and the materials can be conveyed continuously and stably in the flow cavity.

[0017] Optionally, a sliding groove is provided on the side where the scraper abuts the inner wall of the kettle body, an abutment strip is slidably arranged in the sliding groove, an elastic member is provided between the abutment strip and the scraper, and the elastic member is used to make the abutment strip pop out of the sliding groove to slide and abut against the inner wall of the kettle body.

[0018] By adopting the above technical solution, the abutment strip can pop out of the chute and slide against the inner wall of the kettle body. This structure can ensure that when the scraper moves along the inner wall of the kettle body, the abutment strip always closely fits the inner wall of the kettle body, thereby effectively removing the materials adhering to the inner wall of the kettle body, reducing material residue and improving the cleaning effect. At the same time, the design of the elastic part can also adapt to the possible slight unevenness of the inner wall of the kettle body, further enhancing the uniformity and reliability of scraping.

[0019] Optionally, a reducer is further included, wherein the input shaft of the reducer is connected to the output shaft of the driving member, and the output shaft of the reducer is connected to the rotating shaft.

[0020] By adopting the above technical solution, the setting of the reducer can effectively reduce the speed of the output shaft of the driving member and increase the torque, thereby ensuring that the shaft runs stably under low speed and high torque state, improving the mixing efficiency, making the mixing process more stable and controllable, and avoiding problems such as material splashing or uneven mixing due to excessive speed.

[0021] Optionally, a retaining frame is fixed on the separation cylinder, and the retaining frame is rotatably connected to one end of the rotating shaft located in the separation cylinder.

[0022] By adopting the above technical solution, the retainer fixed on the separation cylinder can provide stable support for the shaft, preventing the shaft from deflecting or vibrating during high-speed rotation, thereby ensuring the stability of the stirring process. At the same time, this structural design helps to improve the durability and reliability of the equipment and extend the service life of the esterification kettle.

[0023] Optionally, the scraper is concave in shape, and the concave side faces the rotation direction of the scraper.

[0024] By adopting the above technical solution, when the scraper rotates to scrape the material on the inner wall of the kettle, it can push the material to the middle of the circulation cavity to increase the flow rate of the material and further promote the uniform mixing of the material. At the same time, it can effectively increase the contact area between the scraper and the inner wall of the kettle and reduce the resistance of the scraper during movement, further improving the scraping effect of the material on the inner wall of the kettle.

[0025] In summary, this application includes the following beneficial technical effects: 1. It can improve the efficiency and uniformity of material mixing and reduce the adhesion of materials to the inner wall of the kettle. Specifically, when the first blade rotates, it can cause the material to form a vortex flow in the kettle, which not only completely disrupts the stratification of the material in the vertical direction, but also presses the material to the bottom of the kettle, further destroying the stratification structure of the material in the horizontal direction, thereby achieving sufficient mixing of the material in the horizontal and vertical directions; the design of the separation cylinder effectively avoids the direct collision between the upper material and the lower material when the upper material is squeezed downward, ensuring that the lower material can smoothly flow back to the upper layer through the flow cavity, forming a stable circulation flow path, and greatly improving the circulation efficiency of the material; in addition, the drive assembly uses the rotation of the shaft to drive the scraper to rotate around the shaft as the center, and at the same time, combined with the action of the reciprocating screw and the guide rod, the scraper can also move back and forth up and down along the height direction of the kettle during the rotation process, covering all corners of the inner wall of the kettle in all directions. This design enables the scraper to efficiently remove materials adhering to the inner wall of the kettle, thereby reducing the uneven mixing caused by material adhesion, and significantly improving the product yield and production efficiency; 2. The second paddle can further stir the material flowing out from the second end of the separation cylinder and push the material toward the inner wall of the kettle, increasing the flow path and mixing effect of the material in the reaction chamber, reducing the accumulation of the material at the second end of the separation cylinder, and improving the uniformity of the material. The baffle plate cooperates with the second paddle to form a shearing effect on the material, effectively reducing the stratification of the material, and further breaking up the agglomeration of the material, improving the dispersion and fluidity of the material, thereby significantly improving the mixing efficiency and reaction quality of the material; 3. The rotation of the second gear can drive the third gear and the transmission shaft to rotate. The spiral blades can transport the material on the outside of the second end of the separation cylinder to the first end as the transmission shaft rotates, effectively promoting the flow of materials in the flow chamber and improving the uniformity of material mixing. At the same time, the spiral blades can also revolve around the central axis of the separation cylinder. The design of the spiral blades slidingly abutting against the outer wall of the separation cylinder can scrape off the material attached to any position on the outer wall of the separation cylinder, reduce the adhesion of the material to the outer wall of the separation cylinder, and further avoid the problem of uneven mixing caused by material adhesion. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0027] Figure 2 yes Figure 1 A partial enlarged view of part A.

[0028] Figure 3 yes Figure 1 A partial enlarged view of part B.

[0029] Description of reference numerals: 1, kettle body; 11, inner kettle body; 111, connecting hole; 112, material inlet; 113, material outlet; 12, outer kettle body; 121, steam outlet; 13, reaction chamber; 14, circulation chamber; 15, isolation chamber; 2, circulation stirring assembly; 21, separation cylinder; 22, rotating shaft; 23, first paddle; 24, driving member; 25, second paddle; 26, material blocking plate; 27, retaining frame; 3, driving assembly; 31. First gear; 32. Ring gear; 33. Mounting frame; 34. Second gear; 4. Scraping assembly; 41. Reciprocating screw; 42. Guide rod; 43. Scraper; 431. Slide groove; 44. Transmission shaft; 45. Third gear; 46. Spiral blade; 47. Abutment strip; 48. Elastic member; 5. Jacket; 51. Insulation chamber; 52. Heat transfer medium input port; 53. Heat transfer medium output port; 6. Speed ​​reducer; 7. Heating coil. DETAILED DESCRIPTION

[0030] The following combination Figure 1-Figure 3 This application is described in further detail.

[0031] The embodiment of the present application discloses an internal circulation esterification kettle.

[0032] Reference Figure 1 and Figure 2In this embodiment, the inner circulation esterification kettle comprises a kettle body 1, a circulation stirring component 2, a driving component 3 and a scraping component 4. The kettle body 1 has a vertical cylindrical appearance, and a reaction chamber 13 for accommodating and reacting materials is provided in the kettle body 1. The reaction chamber 13 is also cylindrical; the kettle body 1 comprises an inner kettle body 11 and an outer kettle body 12. The outer kettle body 12 is sleeved on the outer side of the inner kettle body 11, and one end of the outer kettle body 12 is fixed on the outer wall of the inner kettle body 11 to achieve the connection between the two. The reaction chamber 13 is opened in the inner kettle body 11, and a heating coil 7 for heating the material is provided in the inner kettle body 11. A closed isolation chamber 15 is formed between the inner wall of the inner kettle body 11 and the outer wall of the outer kettle body 12. A connecting hole 111 is provided at the top of the inner kettle body 11 to connect the reaction chamber 13 and the isolation chamber 15. The gas in the reaction chamber 13 can enter the isolation chamber 15 through the connecting hole 111, thereby achieving gas-liquid separation. Moreover, such a design can also prevent the heat of the material from being directly dissipated to the outside through the outer kettle body 12 after the material directly contacts the outer kettle body 12, effectively blocking the heat of the material from being transferred to the outer kettle body 12, and reducing heat loss.

[0033] The top and bottom of the inner kettle body 11 are respectively provided with a material inlet 112 and a material outlet 113 connected to the reaction chamber 13 for the material to enter and exit. The outer kettle body 12 is provided with a steam outlet 121 connected to the isolation chamber 15 for the steam in the isolation chamber 15 to be discharged. The outer side of the outer kettle body 12 is provided with a jacket 5, and an insulation chamber 51 for the circulation of a heat-conducting medium is formed between the inner wall of the jacket 5 and the outer wall of the outer kettle body 12. The jacket 5 is provided with a heat-conducting medium input port 52 and a heat-conducting medium output port 53 connected to the insulation chamber 51. In this way, the heat-conducting medium can circulate in the insulation chamber 51 through the heat-conducting medium input port 52 and the heat-conducting medium output port 53, thereby controlling the temperature of the material in the kettle body 1 and ensuring that the esterification reaction is carried out within a suitable temperature range. In other embodiments, the inner kettle body 11 and the outer kettle body 12 can also be other shapes; the heating coil 7 can also be replaced with any other form of heater.

[0034] Reference Figure 1 and Figure 2 In this embodiment, the circulating stirring assembly 2 includes a separation cylinder 21, a rotating shaft 22, a first paddle 23, a driving member 24, a second paddle 25 and a material baffle 26; the separation cylinder 21 is specifically a cylindrical stainless steel cylinder with a diameter smaller than the inner diameter of the inner kettle body 11, which has corrosion resistance and high strength; the inner and outer surfaces of the separation cylinder 21 are polished to reduce the adhesion of materials; the separation cylinder 21 is arranged in the reaction chamber 13 and is coaxial with the reaction chamber 13, and a flow chamber 14 connected to the reaction chamber 13 is formed between the inner wall of the inner kettle body 11 and the outer wall of the separation cylinder 21, and the heating coil 7 is located in the flow chamber 14; both ends of the separation cylinder 21 are open and connected to the reaction chamber 13, and one end of the separation cylinder 21 located at the bottom of the reaction chamber 13 is fixedly connected to the bottom surface of the inner kettle body 11 through a plurality of connecting rods.

[0035] The rotating shaft 22 is specifically a hollow cylindrical shaft made of stainless steel, which reduces weight while having high strength; the rotating shaft 22 is rotatably connected to the top of the outer kettle body 12 through a bearing, and one end of the rotating shaft 22 extends into the separation barrel 21 and passes through the upper and lower ends of the separation barrel 21, and the central axis of the rotating shaft 22 is coaxial with the central axis of the reaction chamber 13. The first paddle 23 is a pitched blade paddle made of stainless steel, which is fixed on the rotating shaft 22 and located in the separation barrel 21, and the end of the first paddle 23 away from the rotating shaft 22 is infinitely close to the inner wall of the separation barrel 21 but does not contact it.

[0036] The driving member 24 is a motor, and the driving member 24 is used to drive the rotating shaft 22 to rotate. In this way, when the driving member 24 rotates, the rotating shaft 22 is driven to rotate, and the first blade 23 can suck the material from the first end of the separation cylinder 21, and push the material to the second end of the separation cylinder 21, and then return to the first end of the separation cylinder 21 through the flow chamber 14, so as to realize the circulation of the material and completely disrupt the stratification of the material in the vertical direction and the horizontal direction, so as to fully mix and stir the material.

[0037] Preferably, the internal circulation esterification kettle also includes a reducer 6, and the reducer 6 can be a gear reducer with an adjustable transmission ratio. The input shaft of the reducer 6 is connected to the output shaft of the driving member 24, and the output shaft of the reducer 6 is connected to the rotating shaft 22. In this way, when the output shaft of the driving member 24 rotates, the rotating shaft 22 can be driven to rotate, and the reducer 6 can increase the torque of the rotating shaft 22. In other embodiments, the material of the separation cylinder 21 can also be selected from other high-strength, corrosion-resistant metals or alloy materials according to actual needs, such as nickel-based alloys or titanium alloys; the rotating shaft 22 can also be a solid shaft.

[0038] Reference Figure 1 and Figure 2 In this embodiment, the second blade 25 is a straight blade, and the material can also be stainless steel. The second blade 25 is fixed on the rotating shaft 22 and is located on the outside of the second end of the separation cylinder 21; the material baffle plate 26 is fixed on the inner wall of the inner kettle body 11 and is located on the outside of the end of the second blade 25 away from the rotating shaft 22. A plurality of material baffle plates 26 are arranged at equal intervals along the rotating axis of the rotating shaft 22. In this way, when the rotating shaft 22 rotates, the second blade 25 further stirs the material flowing out of the second end of the separation cylinder 21, and pushes the material onto the inner wall of the inner kettle body 11, thereby increasing the flow path and mixing effect of the material in the reaction chamber 13, and reducing the accumulation of the material at the second end of the separation cylinder 21; the material baffle plate 26 cooperates with the second blade 25 to form a shearing effect on the material, further breaking the agglomeration of the material, and improving the dispersion and fluidity of the material.

[0039] Preferably, a retaining frame 27 is provided in the separation cylinder 21. The retaining frame 27 is made of the same material as the separation cylinder 21. One end of the retaining frame 27 is welded and fixed to the inner wall of the separation cylinder 21, and the other end is rotatably connected to one end of the rotating shaft 22 located in the separation cylinder 21 through a bearing; in this way, the retaining frame 27 can provide stable support for the rotating shaft 22, preventing the rotating shaft 22 from deflecting or vibrating during high-speed rotation, thereby ensuring the smoothness of the stirring process.

[0040] Reference Figure 1 and Figure 2 In this embodiment, the driving assembly 3 is arranged at the top of the outer kettle body 12, and the driving assembly 3 includes a first gear 31, a ring gear 32, a mounting frame 33 and a second gear 34; the first gear 31 is a spur gear, the first gear 31 is fixed on the rotating shaft 22 and rotates together with the rotating shaft 22, and the first gear 31 is coaxial with the rotating shaft 22; the ring gear 32 is a spur gear ring 32, the ring gear 32 is fixed on the inner side wall of the outer kettle body 12 and is coaxial with the first gear 31, and the first gear 31 is located on the inner side of the ring gear 32; the mounting frame 33 is rotatably connected to the rotating shaft 22 through a bearing; the second gear 34 is also a spur gear, the second gear 34 is rotatably arranged on the mounting frame 33 through a bearing, and one side of the second gear 34 is meshed with the first gear 31, and the other side is meshed with the ring gear 32. In this way, the first gear 31, the ring gear 32, the mounting frame 33 and the second gear 34 form a planetary gear system. When the rotating shaft 22 rotates, the second gear 34 can also rotate while revolving around the rotating shaft 22. In other embodiments, the tooth shapes of the first gear 31, the ring gear 32 and the second gear 34 can also be helical teeth or herringbone teeth.

[0041] Reference Figure 1 and Figure 3 In this embodiment, the scraping assembly 4 includes a reciprocating screw 41, a guide rod 42, a scraper 43, a transmission shaft 44, a third gear 45 and a spiral blade 46; one end of the reciprocating screw 41 is fixed on the end face of the second gear 34, and the other end extends to the bottom of the inner kettle body 11, and the reciprocating screw 41 is coaxial with the second gear 34; the guide rod 42 is specifically a cylindrical stainless steel rod, and the surface is coated with an anti-adhesion coating to reduce material adhesion. One end of the guide rod 42 is fixed on the mounting frame 33, and the other end extends to the bottom of the inner kettle body 11, and the extension direction of the guide rod 42 is parallel to the extension direction of the reciprocating screw 41. The scraper 43 is slidably arranged on the guide rod 42 and is threadedly connected to the reciprocating screw 41, and one side of the scraper 43 is slidably abutted against the inner side wall of the inner kettle body 11. It should be pointed out that the reciprocating screw 41 is an existing mature technology, so the principle of its cooperation with the guide rod 42 to realize the reciprocating motion of the scraper 43 is not described in detail here. In other embodiments, the guide rod 42 may also be a polygonal column, and the material may also be aluminum alloy or high-strength steel.

[0042] In this way, when the rotating shaft 22 rotates, the second gear 34 drives the reciprocating screw 41 to rotate together, and the scraper 43, driven by the reciprocating screw 41 and the guide rod 42, can revolve around the rotating shaft 22 with the central axis of the rotating shaft 22 as the rotation center, and reciprocate up and down along the inner wall of the inner kettle body 11, thereby scraping off the material adhering to the inner wall of the inner kettle body 11, so as to reduce the problem of uneven mixing caused by material adhesion. In particular, for the material in the bottom corner of the inner kettle body 11, due to the problem of low fluidity, the material will form a "dead zone", and the material in this area is difficult to be evenly mixed with the material in other areas by stirring alone; but the setting of the scraper 43 can scrape the material in this area to the area with high flow rate and fully mix it with the material in other areas.

[0043] Preferably, a chute 431 is provided on one side of the scraper 43 that slides against the inner wall of the inner kettle body 11; an abutment bar 47 is slidably provided in the chute 431, and the sliding direction of the abutment bar 47 is perpendicular to the inner wall of the inner kettle body 11. The abutment bar 47 is made of high-strength alloy steel and has high strength and wear resistance; an elastic member 48 is provided between the abutment bar 47 and the scraper 43, and the elastic member 48 is a spring, one end of the elastic member 48 is fixedly connected to the bottom of the chute 431, and the other end is fixedly connected to the abutment bar 47, and the elastic member 48 can make the abutment bar 47 pop out of the chute 431 and slide against the inner wall of the kettle body 1. This design can ensure that when the scraper 43 moves along the inner wall of the kettle body 1, the abutment bar 47 always fits closely to the inner wall of the kettle body 1, thereby effectively removing materials adhering to the inner wall of the kettle body 1.

[0044] Preferably, the scraper 43 is concave and the concave side faces the rotation direction of the scraper 43. In this way, when the scraper 43 rotates to scrape the material on the inner wall of the kettle body 1, it can push the material to the middle of the flow cavity 14 to increase the flow speed of the material and further promote uniform mixing of the material.

[0045] Reference Figure 1 and Figure 3In the present embodiment, the transmission shaft 44 is specifically a cylindrical shaft made of stainless steel. One end of the transmission shaft 44 is rotatably connected to the mounting frame 33 through a bearing, and the other end extends to the bottom of the inner kettle body 11. The rotation axis of the transmission shaft 44 is parallel to the rotation axis of the rotating shaft 22; the third gear 45 is a spur gear, and the third gear 45 is fixed on the transmission shaft 44 and meshes with the second gear 34; the spiral blade 46 is welded and fixed on the transmission shaft 44 and is located in the flow chamber 14, and the outer side of the spiral blade 46 is in sliding contact with the outer wall of the separation cylinder 21. In this way, when the second gear 34 rotates, it drives the third gear 45 to rotate, and the transmission shaft 44 rotates together with the third gear 45. The spiral blades 46 transport the material located on the outside of the second end of the separation cylinder 21 to the outside of the first end of the separation cylinder 21 after the rotation of the transmission shaft 44, thereby promoting the circulation of the material in the flow chamber 14; at the same time, the spiral blades 46 as a whole also revolve around the central axis of the separation cylinder 21. The design of the spiral blades 46 slidingly abutting against the outer wall of the separation cylinder 21 can scrape off the material attached to any position of the outer wall of the separation cylinder 21.

[0046] Preferably, the rotation direction of the spiral blade 46 is the same as the rotation direction of the third gear 45. This design can improve the conveying efficiency of the spiral blade 46 for materials and reduce the phenomenon of materials scattering outside the spiral blade 46 due to the centrifugal force generated by the rotation of the spiral blade 46.

[0047] The implementation principle of an internal circulation esterification kettle in the embodiment of the present application is as follows: when it is necessary to stir the material mixture, the driving member 24 drives the rotating shaft 22 to rotate, and the rotation of the rotating shaft 22 drives the first paddle 23 to suck the material from the first end of the separation cylinder 21, and push the material to the second end of the separation cylinder 21 and then return to the first end of the separation cylinder 21 through the circulation chamber 14, thereby realizing the circulation of the material and completely disrupting the stratification of the material in the vertical and horizontal directions, so that the material is fully mixed and stirred; then, the second paddle 25 on the rotating shaft 22 further stirs the material flowing out from the second end of the separation cylinder 21, and pushes the material to the inner wall of the separation cylinder 21, thereby increasing the flow path and mixing effect of the material in the reaction chamber 13, and reducing the accumulation of the material at the second end of the separation cylinder 21; the baffle plate 26 cooperates with the second paddle 25 to form a shearing effect on the material, further breaking up the agglomeration of the material, and improving Improve the dispersion and fluidity of the material; at the same time, after the rotating shaft 22 rotates, the second gear 34 drives the reciprocating screw 41 to rotate together, and the scraper 43, driven by the reciprocating screw 41 and the guide rod 42, revolves around the rotating shaft 22 with the central axis of the rotating shaft 22 as the rotation center, and reciprocates up and down along the inner wall of the inner kettle body 11, thereby scraping off the material adhering to the inner wall of the inner kettle body 11, so as to reduce the problem of uneven mixing caused by material adhesion; in addition, after the second gear 34 rotates, it drives the third gear 45 to rotate, and the transmission shaft 44 rotates with the third gear 45. After the rotation of the transmission shaft 44, the spiral blade 46 transports the material located on the outside of the second end of the separation cylinder 21 to the outside of the first end of the separation cylinder 21, thereby promoting the circulation of the material in the circulation chamber 14; at the same time, the spiral blade 46 revolves around the central axis of the separation cylinder 21 as a whole to scrape off the material attached to any position of the outer wall of the separation cylinder 21.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An internal circulation esterification kettle, characterized in that: include: A kettle body, wherein a reaction chamber for heating and reacting materials is provided in the kettle body, and the reaction chamber is cylindrical; A circulating stirring assembly, the circulating stirring assembly comprising a separation cylinder, a rotating shaft, a first paddle and a driving member; the separation cylinder is arranged in a reaction chamber, both ends of the separation cylinder are connected to the reaction chamber, and a flow chamber is formed between the outer wall of the separation cylinder and the inner wall of the kettle body; the rotating shaft is rotatably arranged on the kettle body and one end extends into the separation cylinder, and the central axis of the rotating shaft is coaxial with the central axis of the reaction chamber; the first paddle is arranged on the rotating shaft and is located in the separation cylinder; the driving member is used to drive the rotating shaft to rotate; when the rotating shaft rotates, the first paddle can push the material from the first end of the separation cylinder to the second end of the separation cylinder and then flow back to the first end of the separation cylinder through the flow chamber; A driving assembly, the driving assembly comprising a first gear, a gear ring, a mounting frame and a second gear, the first gear being fixed on the rotating shaft and rotating together with the rotating shaft; the gear ring being arranged on the inner wall of the kettle body and being coaxial with the first gear; the mounting frame being rotatably arranged on the rotating shaft; the second gear being rotatably arranged on the mounting frame and meshing with the first gear and the gear ring to form a planetary gear system; A scraping assembly, the scraping assembly includes a reciprocating screw, a guide rod and a scraper, the reciprocating screw is arranged on the second gear and rotates coaxially with the second gear; the guide rod is arranged on the mounting frame and is parallel to the reciprocating screw; the scraper is slidably connected to the guide rod and is threadedly connected to the reciprocating screw, and one end of the scraper slides against the inner wall of the kettle body; when the rotating shaft rotates, the scraper can rotate around the central axis of the rotating shaft and slide back and forth up and down along the inner wall of the kettle body.

2. An internal circulation esterification kettle according to claim 1, characterized in that: The circulating stirring assembly also includes a second paddle and a material baffle plate. The second paddle is arranged on the rotating shaft and located at the second end of the separating cylinder. The second paddle can stir the material flowing out from the second end of the separating cylinder and push it toward the inner wall of the kettle body. The material baffle plate is arranged on the inner wall of the kettle body to cooperate with the second paddle to shear the material.

3. An internal circulation esterification kettle according to claim 1, characterized in that: It also includes a heating coil arranged in the circulation cavity for heating the material; the kettle body includes an inner kettle body and an outer kettle body; the outer kettle body is sleeved on the outside of the inner kettle body, and the reaction chamber is opened in the inner kettle body; an isolation chamber is formed between the inner wall of the inner kettle body and the outer wall of the outer kettle body, and a connecting hole connecting the reaction chamber and the isolation chamber is provided at the top of the inner kettle body, and the gas in the reaction chamber can enter the isolation chamber through the connecting hole.

4. The internal circulation esterification kettle according to claim 1, characterized in that: A jacket is provided on the outer side of the kettle body; a heat preservation cavity for heat transfer medium to flow is formed between the inner wall of the jacket and the outer wall of the kettle body, and a heat transfer medium input port and a heat transfer medium output port communicating with the heat preservation cavity are provided on the jacket.

5. The internal circulation esterification kettle according to claim 1, characterized in that: The scraping assembly also includes a transmission shaft, a third gear and a spiral blade; the transmission shaft is rotatably connected to the mounting frame, and the rotation axis of the transmission shaft is parallel to the rotation axis of the rotating shaft; the third gear is fixed on the transmission shaft and meshes with the second gear; the spiral blade is arranged on the transmission shaft and is located in the flow chamber, and the outer side of the spiral blade is in sliding contact with the outer wall of the separating cylinder; when the second gear rotates, it can drive the transmission shaft to rotate and enable the spiral blade to transport the material on the outside of the second end of the separating cylinder to the first end and scrape the material on the outer wall of the separating cylinder.

6. An internal circulation esterification kettle according to claim 5, characterized in that: The rotation direction of the spiral blade is the same as the rotation direction of the third gear.

7. The internal circulation esterification kettle according to claim 1, characterized in that: A sliding groove is provided on one side of the scraper plate abutting against the inner wall of the kettle body, an abutment strip is slidably arranged in the sliding groove, an elastic member is provided between the abutment strip and the scraper plate, and the elastic member is used to make the abutment strip pop out of the sliding groove to slide against the inner wall of the kettle body.

8. The internal circulation esterification kettle according to claim 1, characterized in that: It also includes a reducer, wherein the input shaft of the reducer is connected to the output shaft of the driving member, and the output shaft of the reducer is connected to the rotating shaft.

9. The internal circulation esterification kettle according to claim 1, characterized in that: A retaining frame is fixed on the separation cylinder, and the retaining frame is rotatably connected to one end of the rotating shaft located in the separation cylinder.

10. The internal circulation esterification kettle according to claim 1, characterized in that: The scraper is concave in shape, and one concave side faces the rotation direction of the scraper.

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