A centrifugal thin film evaporator

Abstract

The utility model discloses a centrifugal thin film evaporator relates to evaporator technical field, including evaporator body, box one and box two that are fixed coaxially in turn from below to above along the vertical direction, be equipped with drive mechanism in the box two, and the side coaxial connection of drive mechanism close to evaporator body has the sleeve shaft and the transmission shaft, wherein the sleeve shaft is coaxially covered and is equipped with in the transmission shaft outside, and a plurality of centrifugal blades that are annular array distribution about its axial direction are installed on the sleeve shaft outer arc wall, and the sleeve shaft is also equipped with adjusting mechanism, in the utility model, through drive mechanism control adjusting mechanism, need not stop machine dismounts and can realize the synchronous centrifugal expansion or centripetal contraction of centrifugal blade, and further change the interval of centrifugal blade and evaporator inner wall, on one hand prevent the burr that the cylinder wall scouring produces and influence normal rotation, on the other hand can according to the initiative adjustment interval of material characteristics, and further reduce manual intervention, improve the adjustment efficiency.

Description

Technical Field

[0001] This utility model relates to the field of evaporator technology, specifically a centrifugal thin-film evaporator. Background Technology

[0002] Centrifugal thin-film evaporators are devices that use centrifugal force to force materials to form a dynamic thin film on a heated surface, achieving efficient heat transfer and evaporation. With their short contact time, high heat transfer coefficient, and anti-fouling design, these devices are widely used in the concentration of high-viscosity, heat-sensitive materials (such as traditional Chinese medicine extracts, antibiotic solutions, and polymers) in the pharmaceutical, food, and chemical industries.

[0003] Traditional centrifugal evaporators typically employ a rigid, fixed scraper structure, meaning the distance between the scraper and the inner wall of the evaporator is fixed. After long-term operation, the cylinder wall may develop wear or burrs due to material scouring or corrosion, affecting the normal rotation of the scraper. This requires disassembling the entire equipment for adjustment, which is cumbersome. Some existing methods for adjusting the distance between the scraper and the cylinder wall still require manual adjustment after stopping the machine, which is inconvenient.

[0004] In view of the above, this application is hereby submitted. Utility Model Content

[0005] The purpose of this invention is to provide a centrifugal thin-film evaporator to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides a centrifugal thin-film evaporator, comprising an evaporator body, a first housing, and a second housing, which are coaxially fixed from bottom to top in a vertical direction. The second housing contains a drive mechanism, and a sleeve shaft and a transmission shaft are coaxially connected on the side of the drive mechanism near the evaporator body. The sleeve shaft is coaxially sleeved on the outside of the transmission shaft. Multiple centrifugal blades are mounted on the outer arc wall of the sleeve shaft in a ring array about its axial direction. An adjustment mechanism is also provided inside the sleeve shaft, and the adjustment mechanism includes: The limiting plate is coaxially fixed to the inner arc wall of the sleeve shaft. A rotating plate is coaxially provided on the side away from the evaporator body. The rotating plate is rotatably connected to the inner arc wall of the sleeve shaft. Multiple limiting channels are provided on the outer edge of the side wall away from the rotating plate, which are arranged in a ring array about its axis and pass through the axis. Multiple rotating channels are provided on the outer edge of the side wall of the rotating plate close to the limiting plate, which are arranged in a ring array about its axis. The limiting channel and the rotation channel have the same slider sliding in them. A horizontal connecting block is fixed at the end of the slider away from the shaft center. A sliding channel is horizontally opened on the outer arc wall of the shaft corresponding to the position of the connecting block. The connecting block is fixedly connected to the centrifugal blade.

[0007] Furthermore, the length direction of the limiting channel is consistent with the radial direction of the limiting disk, the horizontal cross-section of the rotating channel is arc-shaped, one end of which is set towards the axis of the rotating disk, and the other end is bent towards the outer edge of the rotating disk. The drive shaft is coaxially rotated through the limiting disk and is coaxially fixedly connected to the rotating disk. The sliding channel set on the outer arc wall of the sleeve shaft has the same radial direction as the sleeve shaft. The inner sidewall of the connecting block is covered with high temperature resistant sealing material. When the slider moves along the limiting channel to one end close to the axis of the sleeve shaft, the slider does not contact the drive shaft.

[0008] Furthermore, the drive mechanism inside the second housing includes a motor coaxially fixed to the inner wall of the top of the second housing. The output end of the motor is coaxially fixedly connected to the transmission shaft. The sleeve shaft and the transmission shaft are both coaxially rotatably installed through the side wall where the evaporator body connects to the first housing and the side wall where the first housing connects to the second housing. The ends of the sleeve shaft and the transmission shaft, respectively, away from the evaporator body, extend into the second housing. A spline sleeve is coaxially fixedly connected to the outer arc wall of the motor output shaft. A rotating plate is coaxially slidably fitted on the outer side of the spline sleeve. Multiple limiting posts are fixed on the outer edge of the side wall of the rotating plate near the sleeve shaft, arranged in a ring array about its axial direction. The length direction of the limiting posts is parallel to the axial direction of the sleeve shaft. A fixing plate is coaxially fixed on the end of the sleeve shaft near the motor.

[0009] Furthermore, the fixing plate is coaxially sleeved on the outside of the transmission shaft. The outer edge of the side wall of the fixing plate near the rotating plate has multiple arc-shaped grooves arranged in a ring array about its axial direction. The multiple arc-shaped grooves correspond one-to-one with multiple limiting posts and are inserted into each other. The rotating plate is sleeved with a limiting block on its radial horizontal side. The cross section of the limiting block in the vertical plane along the radial direction of the rotating plate is "door" shaped and the opening is set towards the rotating plate. An electric push rod is fixed on the top of the limiting block. The electric push rod is fixed on the inner wall of the top of the box and is set away from the motor.

[0010] Compared with the prior art, the beneficial effects of this utility model are: 1. By controlling the adjustment mechanism through the drive mechanism, the centrifugal blades can be synchronously expanded or contracted centrifugally without stopping the machine or disassembling. This changes the distance between the centrifugal blades and the inner wall of the evaporator. On the one hand, it prevents burrs caused by the scouring of the cylinder wall from affecting normal rotation. On the other hand, it can actively adjust the distance according to the material characteristics, thereby reducing manual intervention and improving adjustment efficiency.

[0011] 2. Automatic control of blade gap can also avoid the destruction of the vacuum environment inside the evaporator body, so that no additional vacuum environment needs to be generated after adjustment, thus reducing energy consumption. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of the internal structure of a centrifugal thin-film evaporator. Figure 2 for Figure 1Enlarged view of the structure at point A in the middle; Figure 3 A cross-sectional view of the internal structure of a sleeve shaft in a centrifugal thin-film evaporator; Figure 4 An exploded view of the regulating mechanism in a centrifugal thin-film evaporator; Figure 5 This is a schematic diagram of the overall structure of a centrifugal thin-film evaporator.

[0013] In the picture: 10. Evaporator body; 11. Housing 1; 12. Housing 2; 20. Motor; 21. Spline sleeve; 22. Rotating plate; 23. Limiting post; 24. Fixing plate; 25. Electric push rod; 26. Limit block; 30. Sleeve shaft; 31. Drive shaft; 32. Limiting disc; 321. Limiting channel; 33. Rotating disc; 331. Rotating channel; 34. Slider; 35. Connecting block; 36. Centrifugal blade. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see the appendix Figure 1 To be continued Figure 5 This utility model provides a centrifugal thin-film evaporator, comprising an evaporator body 10, a first housing 11, and a second housing 12, which are coaxially fixed from bottom to top in a vertical direction. The second housing 12 contains a drive mechanism. A sleeve shaft 30 and a transmission shaft 31 are coaxially connected to the drive mechanism on the side near the evaporator body 10. The sleeve shaft 30 is coaxially sleeved on the outside of the transmission shaft 31. Multiple centrifugal blades 36 are mounted on the outer arc wall of the sleeve shaft 30 in a ring array about its axial direction. An adjustment mechanism is also provided inside the sleeve shaft 30, and the adjustment mechanism includes: The limiting disk 32 is coaxially fixed to the inner arc wall of the sleeve shaft 30. A rotating disk 33 is coaxially provided on the side away from the evaporator body 10. The rotating disk 33 is rotatably connected to the inner arc wall of the sleeve shaft 30. Multiple limiting channels 321 are provided on the outer edge of the side wall away from the rotating disk 33, which are arranged in a ring array about its axial direction and penetrate along the axial direction. Multiple rotating channels 331 are provided on the outer edge of the side wall of the rotating disk 33 close to the limiting disk 32, which are arranged in a ring array about its axial direction. The same slider 34 slides within the limiting channel 321 and the rotation channel 331. A horizontal connecting block 35 is fixed at one end of the slider 34 away from the axis of the sleeve shaft 30. A sliding channel is horizontally opened on the outer arc wall of the sleeve shaft 30 at the position corresponding to the connecting block 35. The connecting block 35 is fixedly connected to the centrifugal blade 36. The length direction of the limiting channel 321 is consistent with the radial direction of the limiting disk 32. The horizontal cross section of the rotating channel 331 is arc-shaped, with one end facing the axis of the rotating disk 33 and the other end bent towards the outer edge of the rotating disk 33. The transmission shaft 31 is coaxially rotated through the limiting disk 32 and is coaxially and fixedly connected to the rotating disk 33. The sliding channel set on the outer arc wall of the sleeve shaft 30 has the same radial direction as the sleeve shaft 30. The inner side wall of the connecting block 35 is covered with high temperature resistant sealing material. When the slider 34 moves along the limiting channel 321 to one end close to the axis of the sleeve shaft 30, the slider 34 does not contact the transmission shaft 31.

[0016] It should be noted that: a distributor and a gas-liquid separator are also provided inside the first box 11, and a jacketed heater is added inside the side wall of the second box 12. The feed inlet, primary steam outlet and secondary steam outlet are arranged alternately in the vertical direction on the outer side wall of the first box 11. The distributor corresponds to the feed inlet, and the gas-liquid separator is set above the steam outlet. For the specific structure and setting, refer to the structure and setting method in the authorized patent document "Centrifugal Scraped Thin Film Evaporator" with application number CN201922070786.5. The drive mechanism can drive the sleeve shaft 30 and the transmission shaft 31 to rotate synchronously or drive only the transmission shaft 31 to rotate. When only the transmission shaft 31 is driven to rotate, the rotating disk 33 rotates relative to the limiting disk 32. The rotation channel 331 on the rotating disk 33 forces the slider 34 to slide along the limiting channel 321, thereby driving the corresponding centrifugal blades 36 to make centrifugal or centripetal movements through the connecting block 35 to change the distance between the centrifugal blades 36 and the inner wall of the evaporator body 10. When the sleeve shaft 30 and the transmission shaft 31 rotate synchronously, the limiting disk 32 and the rotating disk 33 rotate synchronously. At this time, the connecting block 35 will not move radially along the sleeve shaft 30, that is, at this time the centrifugal blades 36 will not make centrifugal or centripetal movements, thus forming stability. It is understood that the multi-layer centrifugal blades 36 on the outer arc wall of the sleeve shaft 30 can all be synchronously controlled by the aforementioned structure. The specific structure and shape of the centrifugal blades 36 are not limited here. The figure shows only one embodiment. Furthermore, both ends of the slider 34 are fixed with sliding columns in the vertical direction. The horizontal cross section of the sliding column corresponding to the limiting disk 32 is rectangular to further maintain the stability of the slider 34, while the horizontal cross section of the sliding column corresponding to the rotating disk 33 is circular, so that the movement of the slider 34 is smoother when the rotating disk 33 rotates.

[0017] Please see the appendix Figure 1 To be continued Figure 5 The present invention provides a technical solution: the driving mechanism inside the second housing 12 includes a motor 20 coaxially fixed on the inner wall of the top of the second housing 12, the output end of the motor 20 is coaxially fixedly connected to the transmission shaft 31, the sleeve shaft 30 and the transmission shaft 31 are coaxially rotatably arranged through the side wall where the evaporator body 10 connects with the first housing 11 and the side wall where the first housing 11 connects with the second housing 12, and the sleeve shaft 30 and the transmission shaft 31 are respectively located away from the evaporator body 10 and extend into the second housing 12; A spline sleeve 21 is coaxially fixedly connected to the outer arc wall of the output shaft of the motor 20. A rotating plate 22 is coaxially slidably sleeved on the outer side of the spline sleeve 21. A plurality of limiting posts 23 are fixed on the outer edge of the side wall of the rotating plate 22 near the sleeve shaft 30, which are arranged in a ring array about its axial direction. The length direction of the limiting posts 23 is parallel to the axial direction of the sleeve shaft 30. A fixing plate 24 is coaxially fixed at one end of the sleeve shaft 30 near the motor 20. The fixing plate 24 is coaxially sleeved on the outside of the transmission shaft 31. The outer edge of the side wall of the fixing plate 24 near the rotating plate 22 has multiple arc-shaped grooves arranged in a ring array about its axial direction. The multiple arc-shaped grooves correspond one-to-one with the multiple limiting posts 23 and are inserted into each other. The rotating plate 22 is fitted with a limiting block 26 on its radial horizontal side. The cross section of the limiting block 26 on the vertical plane where the radial direction of the rotating plate 22 is located is "door" shaped and the opening is set towards the rotating plate 22. An electric push rod 25 is fixed on the top of the limiting block 26. The electric push rod 25 is fixed on the inner wall of the top of the box 12 and is set away from the motor 20.

[0018] It should be noted that: the inner sidewalls of the limit blocks 26 that are close to each other at the end of the rotating plate 22 are all fitted with balls. The rotating plate 22 rolls against the balls. The balls are used to reduce the friction between the rotating plate 22 and the inner wall of the limit block 26 when the limit blocks 26 push the rotating plate 22 to move axially along the spline sleeve 21. With the cooperation of the rotating plate 22 and the spline sleeve 21, the rotating plate 22 can not only slide freely along the axial direction of the spline sleeve 21, but the motor 20 can also transmit the output torque to the rotating plate 22 through the spline sleeve 21. When the limiting post 23 is not inserted into the arc groove on the fixed plate 24, the motor 20 directly drives the transmission shaft 31 to drive the rotating disk 33 in the adjustment mechanism to rotate, driving multiple centrifugal blades 36 to perform synchronous centrifugal or centripetal motion to change the spacing. When the electric push rod 25 pushes the limiting block 26 to drive the rotating plate 22 to move axially along the transmission shaft 31, the rotating plate 22 drives the limiting post 23 to move toward the fixed plate 24. The arc-shaped groove on the side wall of the fixed plate 24 near the rotating plate 22 gradually decreases in depth away from the inner side wall of the rotating plate 22 along the working rotation direction and transitions smoothly. This makes it easier for the limiting post 23 to be inserted into the arc-shaped groove in the rotating state. When the limiting post 23 is inserted into the arc-shaped groove, the fixed plate 24 and the rotating plate 22 are linked by the limiting post 23. At this time, the fixed plate 24 will receive the torque transmitted from the rotating plate 22. Thus, the fixed plate 24 will rotate synchronously with the rotating plate 22. Since the fixed plate 24 drives the sleeve shaft 30 to rotate, the sleeve shaft 30 and the transmission shaft 31 rotate synchronously.

[0019] Working principle: When the motor 20 starts, its output torque is transmitted to the rotating plate 22 through the spline sleeve 21. When the electric push rod 25 does not push the limit block 26, the limit post 23 is not inserted into the arc-shaped groove of the fixed plate 24. The motor 20 only drives the transmission shaft 31 to rotate, which drives the rotating disk 33 to rotate. The rotating channel 331 forces the slider 34 to slide along the limit channel 321. Through the connecting block 35, the centrifugal blades 36 are driven to make centrifugal or centripetal movements, changing the distance between them and the inner wall of the evaporator body 10 to adapt to different material requirements. When the electric push rod 25 pushes the limit block 26, the limit post 23 is inserted into the arc-shaped groove. The fixed plate 24 and the rotating plate 22 are linked, which drives the sleeve shaft 30 and the transmission shaft 31 to rotate synchronously. At this time, the centrifugal blade 36 is in a stable position and forms a stable liquid film for evaporation. The rectangular and circular sliding columns at both ends of the slider 34 enhance stability and smoothness of movement, respectively, and the ball bearings in the limit block 26 reduce friction.

Claims

1. A centrifugal thin-film evaporator, comprising an evaporator body (10), a first casing (11), and a second casing (12) coaxially fixed from bottom to top in a vertical direction, characterized in that: The housing 2 (12) is equipped with a drive mechanism. A sleeve shaft (30) and a transmission shaft (31) are coaxially connected on the side of the drive mechanism near the evaporator body (10). The sleeve shaft (30) is coaxially sleeved on the outside of the transmission shaft (31). Multiple centrifugal blades (36) are installed on the outer arc wall of the sleeve shaft (30) in a ring array about its axial direction. An adjustment mechanism is also provided inside the sleeve shaft (30). The adjustment mechanism includes: The limiting disk (32) is coaxially fixed on the inner arc wall of the sleeve shaft (30). A rotating disk (33) is coaxially provided on the side away from the evaporator body (10). The rotating disk (33) is rotatably connected to the inner arc wall of the sleeve shaft (30). Multiple limiting channels (321) are provided on the outer edge of the side wall of the limiting disk (32) away from the rotating disk (33) in a ring array about its axial direction and penetrating along the axial direction. Multiple rotating channels (331) are provided on the outer edge of the side wall of the rotating disk (33) close to the limiting disk (32). The same slider (34) slides in the limiting channel (321) and the rotation channel (331). A horizontal connecting block (35) is fixed at one end of the slider (34) away from the axis of the sleeve shaft (30). A sliding channel is horizontally opened on the outer arc wall of the sleeve shaft (30) at the position corresponding to the connecting block (35). The connecting block (35) is fixedly connected to the centrifugal blade (36).

2. A centrifugal thin-film evaporator as described in claim 1, characterized in that: The length direction of the limiting channel (321) is consistent with the radial direction of the limiting disk (32). The horizontal cross section of the rotating channel (331) is arc-shaped, with one end facing the axis of the rotating disk (33) and the other end bent towards the outer edge of the rotating disk (33). The transmission shaft (31) is coaxially rotated through the limiting disk (32) and is coaxially fixedly connected to the rotating disk (33).

3. A centrifugal thin-film evaporator as described in claim 1, characterized in that: The sliding channel set on the outer arc wall of the sleeve shaft (30) runs through the same direction as the radial direction of the sleeve shaft (30). The inner side wall of the connecting block (35) is covered with high temperature resistant sealing material. When the slider (34) moves along the limiting channel (321) to one end close to the axis of the sleeve shaft (30), the slider (34) does not contact the transmission shaft (31).

4. A centrifugal thin-film evaporator as described in claim 1, characterized in that: The drive mechanism inside the second housing (12) includes a motor (20) coaxially fixed on the inner wall of the top of the second housing (12). The output end of the motor (20) is coaxially fixedly connected to the transmission shaft (31). The sleeve shaft (30) and the transmission shaft (31) are coaxially rotated through the side wall where the evaporator body (10) connects to the first housing (11) and the side wall where the first housing (11) connects to the second housing (12). The sleeve shaft (30) and the transmission shaft (31) are respectively located away from the evaporator body (10) and extend into the second housing (12).

5. A centrifugal thin-film evaporator as described in claim 4, characterized in that: A spline sleeve (21) is coaxially fixedly connected to the outer arc wall of the output shaft of the motor (20). A rotating plate (22) is coaxially slidably sleeved on the outer side of the spline sleeve (21). Multiple limiting posts (23) are fixed on the outer edge of the side wall of the rotating plate (22) near the sleeve shaft (30) in a ring array about its axial direction. The length direction of the limiting posts (23) is parallel to the axial direction of the sleeve shaft (30). A fixing plate (24) is coaxially fixed at one end of the sleeve shaft (30) near the motor (20).

6. A centrifugal thin-film evaporator as described in claim 5, characterized in that: The fixing plate (24) is coaxially sleeved on the outside of the transmission shaft (31). The outer edge of the side wall of the fixing plate (24) near the rotating plate (22) has multiple arc-shaped grooves arranged in a ring array about its axial direction. The multiple arc-shaped grooves correspond one-to-one with the multiple limiting posts (23) and are inserted into each other.

7. A centrifugal thin-film evaporator as described in claim 5, characterized in that: The rotating plate (22) is fitted with a limiting block (26) on its horizontal side along its radial direction. The limiting block (26) has a "door" shaped cross section on the vertical plane along the radial direction of the rotating plate (22) and the opening faces the rotating plate (22). An electric push rod (25) is fixed on the top of the limiting block (26). The electric push rod (25) is fixed on the inner wall of the top of the box (12) and avoids the motor (20).

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