A scraped film evaporator

Abstract

This utility model provides a scraped thin-film evaporator, belonging to the technical field of scraped thin-film evaporators. It includes an evaporation cylinder, a heating jacket, and a scraper assembly. The evaporation cylinder consists of a heating section at the top and a diameter-expanding separation section at the bottom. Micro-turbulence pits are formed on the inner wall of the evaporation cylinder. The heating jacket is fitted onto the outer surface of the evaporation cylinder. The scraper assembly is disposed inside the evaporation cylinder and includes a motor and a scraper body. By setting the scraper assembly, under the action of hinges and sliders, the scraper can always adhere to the cylinder wall under centrifugal force. Even if the wall surface has non-roundness due to manufacturing or thermal deformation, the uniformity of the scraped film can be guaranteed. Furthermore, it can be replaced after wear, avoiding direct damage between the rotor and the cylinder. The inner wall surface of the heating section of the evaporation cylinder is processed with dense micro-turbulence pits or shallow grooves, increasing the heat transfer area and generating turbulence during liquid film flow, thus enhancing the heat and mass transfer process.

Description

Technical Field

[0001] This utility model relates to the technical field of scraped film evaporators, and in particular to a scraped film evaporator. Background Technology

[0002] Thin-film evaporators are widely used in pharmaceutical and chemical industries for processes such as concentration and solvent removal. However, conventional thin-film evaporators face challenges with the high viscosity and easily crystallizing solutions used in valganciclovir production, primarily in the following aspects: As the viscosity of the material increases, the scraper on the rotor struggles to form a uniform and continuous liquid film on the heated wall surface, leading to a decrease in heat transfer efficiency and the potential for coking in some areas due to prolonged overheating. When the material flows downwards along the wall under gravity, severe back-mixing occurs, resulting in a wide distribution of residence time within the evaporator and excessively prolonged heating of some materials. Traditional equipment lacks a visual observation window, preventing operators from directly monitoring the internal film formation and material state.

[0003] Therefore, this application provides a scraped film evaporator to meet the requirements. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a scraped film evaporator that can prevent uneven heating caused by uneven scraping of the film, while increasing the heating area of ​​the material, enhancing the heat transfer process, avoiding the problem of excessively long heating time due to excessively wide residence time distribution, and addressing the technical problem of being unable to observe the state of the material inside the equipment.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A scraped film evaporator includes an evaporation cylinder, which is composed of a heating section at the top and a diameter-expanding separation section at the bottom, and the inner wall of the evaporation cylinder is provided with micro-turbulence pits. A heating jacket is fitted and installed on the outer surface of the evaporator cylinder; A scraper assembly is disposed inside the evaporator cylinder. The scraper assembly includes a motor and a scraper body. The motor is mounted on the top of the evaporator cylinder, and a rotating shaft is fixedly connected to the output end of the motor. A sight glass assembly is disposed on one side of the evaporator cylinder. The sight glass assembly includes two cylindrical sight glasses, one of which is fixedly installed on the heating section side of the evaporator cylinder, and the other cylindrical sight glass is fixedly installed on the expansion and separation section side of the evaporator cylinder.

[0006] Under the action of the scraper assembly, the scraper body can always stick to the cylinder wall under the action of centrifugal force. Even if the wall surface is not round due to manufacturing or thermal deformation, the uniformity of the scraped film can be guaranteed. At the same time, it can be replaced after wear, avoiding direct damage to the rotating shaft and the evaporation cylinder. The sight glass assembly can observe the material condition inside the evaporation cylinder.

[0007] Optionally, a plurality of fixed rings are fixedly connected to the outer surface of the rotating shaft, and a plurality of hinge fixing blocks are fixedly connected to one side of the fixed rings, with the plurality of hinge fixing blocks arranged at equal intervals along the circumference of the rotating shaft.

[0008] The fixed ring allows the hinge fixing block to be fixed to the pivot, thus enabling it to be assembled and disassembled with other components.

[0009] Optionally, a mounting groove is provided on one side of the hinge fixing block, a rotating rod is rotatably mounted on the inner wall of the mounting groove, a rotating block is fixedly connected to the outer surface of the rotating rod, and a hinge rotating plate is fixedly connected to the outer surface of the rotating block.

[0010] The rotating rod and rotating block can rotate on the inner wall of the mounting groove, thereby driving the hinge rotating plate to rotate. Combined with the centrifugal force during rotation, the scraper body can fit against the inner wall of the evaporation cylinder.

[0011] Optionally, a torsion spring is fitted on the outer surface of the rotating rod, and the two ends of the torsion spring are fixedly connected to the inner wall of the mounting groove and the outer surface of the rotating block, respectively.

[0012] The torsion spring can work with the rotating rod and rotating block to rotate and reset, thereby keeping the scraper body in contact with the evaporator body.

[0013] Optionally, a groove is provided on one side of the hinge rotating plate, and a slider is slidably connected to the inner wall of the groove. One side of the slider is fixedly connected to one side of the scraper body.

[0014] The slider can work with the slide groove so that components such as the hinge rotating plate can drive the scraper body to fit into the evaporator body.

[0015] Optionally, an LED ring light source is fixedly connected to one side of the cylindrical sight glass.

[0016] The LED ring light source can be used in conjunction with a cylindrical sight glass to observe the material inside the evaporator cylinder.

[0017] Optionally, an annular nozzle is fixedly connected to one side of the cylindrical sight glass located on one side of the heating section of the evaporator body, and a water pipe is installed on one side of the annular nozzle, which penetrates the inside of the cylindrical sight glass and is connected to an external water supply component.

[0018] The ring nozzle can spray cleaning solvent onto the cylindrical sight glass, thereby preventing material from adhering to the cylindrical sight glass and affecting observation.

[0019] Compared with the prior art, this utility model has at least the following beneficial effects: By setting up a scraper assembly, under the action of hinges and sliders, the scraper can always adhere to the cylinder wall under centrifugal force. Even if the wall surface is not round due to manufacturing or thermal deformation, the uniformity of the scraped film can be guaranteed. At the same time, it can be replaced after wear, avoiding direct damage between the rotor and the cylinder. The inner wall surface of the heating section of the evaporation cylinder is processed with dense micro-turbulence pits or shallow grooves, which increases the heat transfer area and generates turbulence when the liquid film flows, thus enhancing the heat and mass transfer process. By setting up a sight glass assembly, the material state inside the evaporation cylinder can be easily observed through the cylindrical sight glass. At the same time, a nozzle is added to one of the cylindrical sight glasses to clean it and prevent material adhesion from affecting the observation. Attached Figure Description

[0020] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the present invention and, together with the specification, further serve to explain the principles of the present invention and enable those skilled in the art to implement and use the present invention.

[0021] Figure 1 This is a schematic diagram of a scraped thin-film evaporator. Figure 2 This is a cross-sectional view of the structure of a scraped thin-film evaporator; Figure 3 A schematic diagram of the fixed ring structure of a scraped thin film evaporator; Figure 4 For scraped thin film evaporators Figure 3 Enlarged view of the structure at point A in the middle; Figure 5 This is a schematic diagram of the structure at the rotating shaft of a scraped thin film evaporator. Figure 6 For scraped thin film evaporators Figure 5 Enlarged view of the structure at point B.

[0022] [Figure Labels] 1. Evaporator body; 101. Micro-turbulence pits; 2. Heating jacket; 3. Scraper assembly; 31. Motor; 32. Rotating shaft; 33. Fixed ring; 34. Hinge fixing block; 35. Mounting groove; 36. Rotating rod; 37. Rotating block; 38. Torsion spring; 39. Hinge rotating plate; 310. Slide groove; 311. Sliding block; 312. Scraper body; 4. Sight glass assembly; 41. Cylindrical sight glass; 42. LED ring light source; 43. Ring nozzle; 44. Water pipe.

[0023] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiment of this utility model. However, this is only for illustrative purposes and is not intended to limit this utility model to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0026] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this technology based on the specific circumstances.

[0027] In the description of this application, spatial relation terms such as "below," "under," "below," "below," "above," "over," etc., are used herein to describe the relationship between one element or feature shown in the figures and other elements or features. It should be understood that, in addition to the orientation shown in the figures, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figures is flipped, an element or feature described as "below" or "under" or "below" of other elements or features will be oriented "above" other elements or features. Therefore, the exemplary terms "below" and "under" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein are interpreted accordingly.

[0028] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the present invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the present invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0029] The scraped film evaporator provided in this embodiment aims to solve the problem of uneven heating caused by uneven scraping of the scraper film, while increasing the heating area of ​​the material, enhancing the heat transfer process, and avoiding excessively long heating time due to excessively wide residence time distribution. The following technical solutions are provided to address the problems of uneven scraping of the scraper body 312 and excessively long material heating time. The evaporator as a whole consists of an evaporation cylinder 1, a heating jacket 2, a scraper assembly 3, and a sight glass assembly 4. These components work together to achieve uniform scraping of the film by the scraper body 312 and improve the heat transfer efficiency of the material, thereby reducing the heating time.

[0030] like Figures 1-6 As shown, an embodiment of this utility model provides a scraped film evaporator, such as... Figure 1As shown, the device includes an evaporator cylinder 1, a heating jacket 2, a scraper assembly 3, and a sight glass assembly 4. The evaporator cylinder 1 is a one-piece structure, consisting of a heating section at the top and a diameter-expanding separation section at the bottom coaxially connected. The inner wall of the evaporator cylinder 1 is uniformly distributed with micro-turbulence pits 101, which are hemispherical or parabolic in shape. The heating jacket 2 is fitted to the outer surface of the evaporator cylinder 1, forming a closed heating medium flow channel between them. Both ends of the heating jacket 2 are sealed and fixed to the outer wall of the evaporator cylinder 1. Figure 1 , Figure 2 and Figure 3 As shown, the scraper assembly 3 is coaxially disposed inside the evaporator cylinder 1, and includes a motor 31 and a scraper body 312. The motor 31 is fixed to the top center of the evaporator cylinder 1 by a bracket. The output end of the motor 31 extends downward along the axis of the evaporator cylinder 1 and is fixedly connected to a rotating shaft 32. The scraper body 312 is adapted to the inner wall of the evaporator cylinder 1 and is disposed with a gap, such as... Figure 1 and Figure 6 As shown, the sight glass assembly 4 is divided into functional sections corresponding to the evaporator cylinder 1, including two cylindrical sight glasses 41 with the same structure. One cylindrical sight glass 41 is sealed and installed through the side wall of the heating section of the evaporator cylinder 1, and the other cylindrical sight glass 41 is sealed and installed through the side wall of the expansion and separation section of the evaporator cylinder 1. The observation ends of the two cylindrical sight glasses 41 face the inside of the evaporator cylinder 1.

[0031] Under the action of the scraper assembly 3, the scraper body 312 can fit into the interior of the evaporation cylinder 1, making the scraped film uniform. Under the action of the sight glass assembly 4, it is convenient to observe the material condition inside the evaporation cylinder 1.

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, a number of fixing rings 33 are fixed at intervals along the axial direction on the outer surface of the rotating shaft 32 of the scraper assembly 3, and each fixing ring 33 is coaxially arranged with the rotating shaft 32; three hinge fixing blocks 34 are evenly distributed at equal angles along the circumferential direction on the outer circumferential surface of each fixing ring 33, and the hinge fixing blocks 34 are fixed to the fixing rings 33 by bolt structure.

[0033] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a U-shaped mounting groove 35 is provided on the side of the hinge fixing block 34 away from the rotating shaft 32, and a coaxial assembly hole is provided on the opposite side wall of the mounting groove 35; a rotating rod 36 is rotatably inserted in the assembly hole, and a rotating block 37 is fixedly sleeved on the outer surface of the middle part of the rotating rod 36. The outer side wall of the rotating block 37 is fixedly connected to one end of the hinge rotating plate 39, and the other end of the hinge rotating plate 39 extends to the inner wall of the evaporator cylinder 1 and is connected to the scraper body 312.

[0034] like Figure 1 , Figure 3 and Figure 4 As shown, a torsion spring 38 is sleeved on the rotating rod 36. The torsion spring 38 is embedded in the mounting groove 35. One end of the spring is engaged and fixed with the inner wall of the mounting groove 35, and the other end is engaged and fixed with the end face of the rotating block 37. When the torsion spring 38 is in its natural state, the scraper body 312 maintains a preset gap with the inner wall of the evaporation cylinder 1.

[0035] like Figure 3 and Figure 4 As shown, a long strip-shaped groove 310 is provided on the side of the hinge rotating plate 39 away from the rotating block 37. The length direction of the groove 310 is consistent with the extension direction of the hinge rotating plate 39. A slider 311 is adapted to slide in the groove 310. The slider 311 is detachably fixed to the inner side wall of the scraper body 312 by bolts.

[0036] like Figure 5 and Figure 6 As shown, each cylindrical sight glass 41 has an LED ring light source 42 coaxially fixed at one end near the inside of the evaporation cylinder 1. The illumination direction of the LED ring light source 42 is towards the inside of the evaporation cylinder 1, and the power line of the LED ring light source 42 passes through the side wall of the cylindrical sight glass 41 in a sealed manner.

[0037] like Figure 5 and Figure 6 As shown, an online cleaning structure is integrated on the cylindrical sight glass 41 corresponding to the heating section of the evaporator cylinder 1: an annular nozzle 43 is fixed at one end of the cylindrical sight glass 41 near the inside of the evaporator cylinder 1, and the nozzle of the annular nozzle 43 faces the inner wall of the evaporator cylinder 1; the water inlet of the annular nozzle 43 is connected to a water pipe 44, the water pipe 44 is sealed through the side wall of the cylindrical sight glass 41 and extends to the outside, and the water pipe 44 is connected to an external high-pressure water supply component or a cleaning fluid supply component.

[0038] Working principle like Figures 1-6 As shown, when in use, the motor 31 is started, causing the rotating shaft 32 to drive the fixed ring 33 and other components to rotate. At this time, under the action of centrifugal force, the scraper body 312 drives the slider 311 to slide outward, and then fits against the inner wall of the evaporation cylinder 1. During the rotation, when the scraper body 312 contacts the inner wall of the evaporation cylinder 1, it will drive the rotating block 37 and the rotating rod 36 to rotate, and then under the action of the torsion spring 38, it will reset and thus maintain its fit against the inner wall of the evaporation cylinder 1. The material evaporation inside the evaporation cylinder 1 can be observed through the cylindrical sight glass 41. At the same time, with the help of the annular nozzle 43 and the water pipe 44, the external cleaning solvent can be sprayed onto the inner surface of the cylindrical sight glass 41 for cleaning, avoiding material adhesion that would affect the observation.

[0039] While embodiments or examples of this disclosure have been described with reference to the accompanying drawings, it should be understood that the above embodiments are merely exemplary embodiments or examples, and the scope of this utility model is not limited by these embodiments or examples, but only by the granted claims and their equivalents. Various elements in the embodiments or examples may be omitted or replaced by their equivalents. Furthermore, the steps may be performed in a different order than that described in this disclosure. Further, various elements in the embodiments or examples may be combined in various ways. Importantly, as the technology evolves, many elements described herein can be replaced by equivalents that appear after this disclosure.

Claims

1. A scraped-film evaporator, characterized in that, include: Evaporation cylinder (1), the evaporation cylinder (1) is composed of a heating section at the top and a diameter expansion and separation section at the bottom, and the inner wall of the evaporation cylinder (1) is provided with micro-turbulence pits (101). Heating jacket (2), which is sleeved and installed on the outer surface of evaporator cylinder (1); Scraper assembly (3), the scraper assembly (3) is disposed inside the evaporator cylinder (1), the scraper assembly (3) includes a motor (31) and a scraper body (312), the motor (31) is installed on the top of the evaporator cylinder (1), and the output end of the motor (31) is fixedly connected to a rotating shaft (32). Sight glass assembly (4), the sight glass assembly (4) is disposed on one side of the evaporator body (1), the sight glass assembly (4) includes two cylindrical sight glasses (41), one of the cylindrical sight glasses (41) is fixedly installed on one side of the heating section of the evaporator body (1), and the other cylindrical sight glass (41) is fixedly installed on one side of the expansion and separation section of the evaporator body (1).

2. The scraped film evaporator according to claim 1, characterized in that, The outer surface of the rotating shaft (32) is fixedly connected to several fixed rings (33), and one side of the fixed rings (33) is fixedly connected to several hinge fixing blocks (34). The several hinge fixing blocks (34) are arranged at equal intervals along the circumference of the rotating shaft (32).

3. The scraped film evaporator according to claim 2, characterized in that, The hinge fixing block (34) has an installation groove (35) on one side. A rotating rod (36) is rotatably provided on the inner wall of the installation groove (35). A rotating block (37) is fixedly connected to the outer surface of the rotating rod (36). A hinge rotating plate (39) is fixedly connected to the outer surface of the rotating block (37).

4. The scraped film evaporator according to claim 3, characterized in that, The outer surface of the rotating rod (36) is fitted with a torsion spring (38), and the two ends of the torsion spring (38) are fixedly connected to the inner wall of the mounting groove (35) and the outer surface of the rotating block (37), respectively.

5. The scraped film evaporator according to claim 3, characterized in that, A groove (310) is provided on one side of the hinge rotating plate (39), and a slider (311) is slidably connected to the inner wall of the groove (310). One side of the slider (311) is fixedly connected to one side of the scraper body (312).

6. The scraped film evaporator according to claim 1, characterized in that, An LED ring light source (42) is fixedly connected to one side of the cylindrical sight glass (41).

7. The scraped film evaporator according to claim 1, characterized in that, A ring nozzle (43) is fixedly connected to one side of a cylindrical sight glass (41) located on one side of the heating section of the evaporator (1). A water pipe (44) is installed on one side of the ring nozzle (43) and runs through the inside of the cylindrical sight glass (41). The water pipe (44) is connected to an external water supply component.

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