A double support point rack for a wiped film evaporator

Abstract

The application discloses a double-support-point rack of a wiped film evaporator, and relates to the field of chemical equipment, which comprises a support pipe, a connecting pipe, an upper flange, a lower flange and a cover plate, the top of the support pipe and the connecting pipe is connected with the upper flange, the connecting pipe is sleeved on the surface of the support pipe, the bottom of the connecting pipe and the support pipe is connected with the lower flange, the cover plate is detachably connected to the bottom of the support pipe, the bottom of the inner wall of the support pipe is provided with a first deep groove bearing for supporting the bottom of an agitation shaft of the wiped film evaporator, the top of the inner wall of the support pipe is provided with a thrust cylindrical roller bearing for supporting the upper part of the agitation shaft of the wiped film evaporator, a second deep groove bearing and a pair of round nuts, the second deep groove bearing is located at the top of the thrust cylindrical roller bearing, and the round nuts are arranged at the top of the second deep groove bearing. Through the accurate bearing combination and the double-support-point layout, the application solves the problem of 'radial runout + axial movement' of the agitation shaft of the wiped film evaporator during high-speed rotation.

Description

Technical Field

[0001] This application relates to the field of chemical equipment technology, and in particular to a dual-support frame for a scraped film evaporator. Background Technology

[0002] A scraped film evaporator is a high-efficiency evaporation device that uses a rotating scraper to evenly distribute materials on the heating surface to form a thin film, thereby achieving rapid evaporation. Currently, as a high-efficiency heat transfer device, the agitator shaft system of a scraped film evaporator needs to operate stably in a high-temperature and high-vacuum environment. However, with the development of larger evaporators, the increased length of the agitator shaft leads to a decrease in rigidity, and traditional support methods are difficult to meet the stability requirements under high-speed conditions.

[0003] In the existing technology, two main support schemes are used: one is to use a single deep groove ball bearing structure, which is low in cost but cannot withstand radial and axial combined loads at the same time, causing the stirring shaft to wobble; the other is to use angular contact bearings in pairs, which can withstand bidirectional axial forces but have limited radial load capacity, resulting in the angular contact bearings breaking.

[0004] In the existing technology, due to problems such as large shaft vibration and insufficient load-bearing capacity of the single-support frame, frequent failures such as seal failure and shortened bearing life occur, which causes the scraped film evaporator to fail to work properly. Utility Model Content

[0005] In view of the above-mentioned prior art, in order to solve the problem that the single-support frame causes frequent failures such as seal failure and shortened bearing life due to large shaft vibration and insufficient load-bearing capacity, thus causing the scraped film evaporator to fail to work properly, this application provides a double-support frame for the scraped film evaporator.

[0006] This application provides a dual-support frame for a scraped film evaporator, which adopts the following technical solution: A dual-support frame for a scraped film evaporator includes a support tube, a connecting pipe, an upper flange, a lower flange, and a cover plate. The tops of the support tube and the connecting pipe are connected to the upper flange, the connecting pipe is sleeved on the surface of the support tube, and the bottoms of the connecting pipe and the support tube are connected to the lower flange. The cover plate is detachably connected to the bottom of the support tube. The bottom of the inner wall of the support tube is provided with a first deep groove bearing for supporting the bottom of the stirring shaft of the scraped film evaporator. The top of the inner wall of the support tube is provided with a thrust cylindrical roller bearing, a second deep groove bearing, and a pair of round nuts for supporting the upper part of the stirring shaft of the scraped film evaporator. The second deep groove bearing is located on top of the thrust cylindrical roller bearing, and the round nuts are located on top of the second deep groove bearing.

[0007] By adopting the above technical solution, a dual-support combination of "bottom first deep groove bearing + upper thrust cylindrical roller bearing + second deep groove bearing" is used to form upper and lower two-point positioning support. The upper and lower deep groove bearings mainly bear radial force, and together with the thrust bearing, they form a "radial + axial" full-dimensional load-bearing structure. This is suitable for the high-speed and impact-loaded working scenarios of scraped film evaporators, extending the service life of the shaft system. The thrust cylindrical roller bearing is specifically designed to bear the axial force generated when the stirring shaft rotates, avoiding seal failure or component wear caused by axial displacement. When the stirring shaft of the scraped film evaporator needs to drive the scraper to rotate at high speed, and the scraper generates a radial force of contact and scraping against the inner wall of the evaporator, the dual-support design can effectively limit the radial runout and axial movement of the stirring shaft, avoid shaft tilting or vibration, ensure uniform gap between the scraper and the evaporator wall, and improve the scraping effect. At the same time, a pair of round nuts at the top can axially lock and fix the second deep groove bearing to prevent the bearing from moving or shifting position during high-speed rotation, further ensuring the coaxiality and operational stability of the shaft system and reducing vibration and noise.

[0008] Preferably, a washer is provided between the second deep groove bearing and the round nut, and a retaining ring is provided on the top of the washer. The top of the retaining ring contacts the bottom of the round nut, and the edge of the retaining ring is embedded in the inner wall of the support tube.

[0009] By adopting the above technical solution, the washer at the top of the second deep groove bearing can evenly transmit the locking pressure of the round nut to the inner ring of the bearing, avoiding local pressure concentration caused by direct contact between the round nut and the bearing. At the same time, the snap ring and the washer cooperate to form a rigid limit, further preventing axial movement of the second deep groove bearing, and forming a "bidirectional axial constraint" with the lower thrust cylindrical roller bearing, making the axial positioning accuracy of the shaft system higher. Meanwhile, the washer is directly between the inner ring of the second deep groove bearing and the snap ring, which can avoid direct friction between the inner ring of the second deep groove bearing and the snap ring and round nut. When the second deep groove bearing rotates at high speed, the inner ring will produce a small amount of axial movement. The washer can absorb this slight relative displacement, reduce the scraping of the inner ring of the bearing by the snap ring, and at the same time avoid wear caused by direct contact between the threaded end face of the round nut and the inner ring of the second deep groove bearing, thus extending the service life of the second deep groove bearing and the round nut.

[0010] Preferably, a thrust washer is provided between the pair of round nuts to prevent them from pushing against each other, and the pair of round nuts are arranged opposite to each other.

[0011] By adopting the above technical solution, a pair of round nuts are set opposite each other. When tightening, the lower round nut is first locked until it abuts the thrust washer, and then the upper round nut is tightened in the opposite direction and fits tightly with the lower round nut. A continuous axial preload is generated between the two round nuts, which greatly increases the friction between the threaded pairs. At the same time, it counteracts the tendency of the threads to "unlock" due to vibration and centrifugal force when the stirring shaft rotates at high speed, forming a dual guarantee of "mechanical self-locking + frictional anti-loosening". Compared with single round nut locking, the anti-loosening effect is improved by one dimension.

[0012] Preferably, the top of the upper flange is provided with an O-ring for sealing the structural connection with the scraped film evaporator, and the top of the upper flange is provided with a placement groove for placing the O-ring.

[0013] By adopting the above technical solution, the placement groove opened on the top of the upper flange provides a precise installation and positioning space for the O-ring, which can effectively limit the displacement, deformation or detachment of the O-ring during assembly and operation. When the scraped film evaporator is working, there are often high-temperature steam, high-viscosity materials or corrosive media inside, and there may be a certain pressure (negative pressure or slight positive pressure). The placement groove can fix the O-ring in the position of fitting the sealing surface, ensuring that the O-ring and the evaporator connection surface form a uniform and tight contact seal, completely blocking the leakage channels of steam, materials or condensate, and avoiding media loss, environmental pollution or safety hazards.

[0014] Preferably, the top and bottom of the support tube are respectively provided with limiting grooves for placing and limiting the first deep groove bearing, the second deep groove bearing and the thrust cylindrical roller bearing, and the outer ring sidewalls of the first deep groove bearing, the second deep groove bearing and the thrust cylindrical roller bearing are in contact with the inner wall of the limiting groove.

[0015] By adopting the above technical solution and setting a limiting groove, the limiting groove is made to fit tightly with the outer rings of the first deep groove bearing, the second deep groove bearing, and the thrust cylindrical roller bearing. On the one hand, it can firmly fix the position of the first deep groove bearing, the second deep groove bearing, and the thrust cylindrical roller bearing in the radial direction, preventing the outer rings of the bearings from rotating synchronously with the stirring shaft. On the other hand, it can limit the axial displacement of the first deep groove bearing, the second deep groove bearing, and the thrust cylindrical roller bearing, preventing misalignment and slippage of the first deep groove bearing, the second deep groove bearing, and the thrust cylindrical roller bearing during operation. This bidirectional limiting effect can ensure that the stirring shaft is always in the preset rotation trajectory, reduce shaft oscillation, and thus avoid friction and collision between the scraper assembly and the inner wall of the evaporator, ensuring stable operation of the equipment.

[0016] Preferably, a heat medium containing space is formed between the pipe and the support pipe, and a pair of heat medium external threaded joints are connected to the pipe.

[0017] By adopting the above technical solution, the heat medium containment space is wrapped in a ring around the outside of the support pipe. This ring structure allows the heat medium to fully contact the outer wall of the support pipe, greatly increasing the heat exchange area. Compared with local heating, the heat medium in the ring space can transfer heat evenly, reducing the occurrence of excessive local temperature differences in the support pipe and internal components, reducing thermal stress damage to the frame structure. At the same time, the efficient heat exchange effect can quickly reach the target temperature, reducing the amount of heat medium transported and energy loss, and reducing the energy consumption cost of the equipment in the long term.

[0018] Preferably, the cover plate is detachably connected to the bottom of the support tube by screws.

[0019] By adopting the above technical solution, when the screw is tightened, the pre-tightening force can make the cover plate and the bottom of the support tube fit tightly together, so that the first deep groove bearing is limited in the limiting groove. This can effectively prevent external dust, water vapor and material residue from entering the inside of the support tube, avoid contamination or corrosion of the first deep groove bearing at the bottom, provide a reliable sealed foundation for the bottom of the support tube, and further strengthen the protection of the bearing.

[0020] Preferably, the surface of the support tube is fixed to the inner walls of the upper and lower flanges by welding, and the upper and lower flanges are installed on the scraped film evaporator by bolts and nuts.

[0021] By adopting the above technical solutions, the "support pipe-flange welding" ensures the rigidity, sealing and vibration resistance of the core structure and solves the structural stability problem under high-speed conditions; the "flange-evaporator bolt connection" provides flexibility in assembly and maintenance and solves the actual needs of equipment transportation, installation and overhaul. The combination of the two avoids the disadvantages of "all-welded structure" which is difficult to disassemble and cannot adjust errors, and overcomes the defects of "all-bolted connection" which is insufficient rigidity and easy to vibrate and loosen.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. This utility model solves the problem of "radial runout + axial movement" when the stirring shaft of the scraped film evaporator rotates at high speed through precise bearing combination and double support layout. At the same time, it takes into account the compact structure, convenient assembly and economical maintenance, and can effectively improve the operating stability, processing efficiency and service life of the scraped film evaporator, and is suitable for the high-requirement material evaporation and concentration scenarios in industrial production. 2. This utility model, through the design of "washer + snap ring", adds two major functions to the original "double fulcrum + round nut locking" system: "mechanical limit and anti-loosening" and "assembly error compensation". It not only solves the key problems of round nut loosening and bearing movement under high-speed rotation conditions, but also optimizes the assembly process, protects the core components, and further improves the positioning accuracy, operational reliability and service life of the frame, making the fixation of the entire shaft system more secure and maintenance easier. 3. This utility model, through the design of "double round nuts with opposite orientation + thrust washers", strengthens "adjustable double anti-loosening" and "precise clearance control" on the basis of the original anti-loosening and positioning. It not only completely solves the problem of nut loosening under high speed and high vibration conditions, but also extends the service life of core components such as bearings and threads through uniform force transmission and component isolation protection. At the same time, it retains the flexibility of assembly and maintenance, and further improves the reliability and adaptability of the frame. Attached Figure Description

[0023] Figure 1 This is a front sectional view of the double-support frame structure of the scraped film evaporator; Figure 2 This is a partial structural view of the internal structure of the double-support frame of the scraped film evaporator; Figure 3 This is a schematic diagram of the support tube structure; Figure 4 This is a structural diagram of the upper flange; Figure 5 This is a structural diagram of the lower flange.

[0024] Reference numerals in the attached drawings: 1. Support pipe; 2. Connecting pipe; 3. Upper flange; 4. Lower flange; 5. Cover plate; 6. First deep groove bearing; 7. Thrust cylindrical roller bearing; 8. Second deep groove bearing; 9. Round nut; 10. Washer; 11. Snap ring; 12. Thrust washer; 13. O-ring; 14. Limiting groove; 15. External threaded connector for heat medium; 16. Placement groove. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail.

[0026] This application discloses a dual-support frame for a scraped film evaporator.

[0027] Reference Figure 1 and Figure 2A dual-support frame for a scraped film evaporator includes a support tube 1, a connecting pipe 2, an upper flange 3, a lower flange 4, a cover plate 5, a first deep groove bearing 6, a thrust cylindrical roller bearing 7, a second deep groove bearing 8, and a pair of round nuts 9. The support tube 1 and the connecting pipe 2 are coaxially arranged, with the connecting pipe 2 sleeved on the outside of the support tube 1, and a closed heat medium containing space formed between the connecting pipe 2 and the support tube 1. The top ends of both the support tube 1 and the connecting pipe 2 are fixedly connected to the upper flange 3, and the bottom ends of both the support tube 1 and the connecting pipe 2 are fixedly connected to the lower flange 4. The cover plate 5 is detachably connected to the bottom of the support tube 1 and has an opening adapted to the bottom end of the support tube 1. The opening is used for the passage of the stirring shaft of the scraped film evaporator. The first deep groove bearing 6 is embedded at the bottom of the inner wall of the support tube 1 to provide radial support for the bottom of the stirring shaft of the scraped film evaporator. The thrust cylindrical roller bearing 7 and the second deep groove bearing 8 are embedded sequentially from top to bottom at the top of the inner wall of the support tube 1, with the thrust cylindrical roller bearing 7 located below the second deep groove bearing 8. The thrust cylindrical roller bearing 7 is used to bear the axial load of the stirring shaft, and the second deep groove bearing 8 is used to provide radial support for the upper part of the stirring shaft. A pair of round nuts 9 are set on the top of the second deep groove bearing 8 to axially limit and fix the thrust cylindrical roller bearing 7 and the second deep groove bearing 8.

[0028] Specifically, the support pipe 1 and the connecting pipe 2 are coaxially nested to form a closed annular space for the heat medium. The heat medium enters this annular space from a designated interface, flows through the upper and lower flange 4 areas of the entire frame, and then flows out from another interface, achieving circulation. This prevents the material from solidifying and sticking at the mating parts of the frame and the stirring shaft due to temperature drop during the operation of the scraped film evaporator, thus preventing blockage or increased stirring resistance. It also protects precision components such as bearings from the effects of low-temperature media. The two ends of the support pipe 1 and the connecting pipe 2 are fixed by the upper flange 3 and the lower flange 4, respectively, to ensure the sealing of the annular space, prevent heat medium leakage, and ensure thermal efficiency and operational safety. The first deep groove bearing 6 is embedded in the bottom of the inner wall of the support pipe 1 and only bears radial load, that is, it restricts the horizontal swing of the stirring shaft, ensures the coaxiality of the stirring shaft, and avoids vibration or wear caused by eccentricity during rotation. The thrust cylindrical roller bearing 7 is specifically designed to withstand the contact pressure between the scraper and the inner wall of the evaporator during the scraping process, which is transmitted to the stirring shaft and generates axial pressure. Thrust; at the same time, the resistance of the material may also form axial force. The axial force is reduced by rolling friction to reduce the damage to the shaft system and avoid axial movement of the shaft. The second deep groove bearing 8 cooperates with the bottom first deep groove bearing 6 to further strengthen the radial support and form "two-point radial positioning". This completely limits the radial offset of the stirring shaft and ensures stability during high-speed rotation. A pair of round nuts 9 are locked on the top of the second deep groove bearing 8. The thrust cylindrical roller bearing 7 and the second deep groove bearing 8 are fixed axially by the thread preload to prevent the bearings from shifting due to vibration or load changes during operation. This ensures the support accuracy of the bearing assembly. Thus, through "double-layer tube heat medium circulation + clearly defined bearing assembly + detachable maintenance structure", the thermal stability problem of the scraped film evaporator is solved, and the high-precision and high-reliability support of the stirring shaft is achieved. Ultimately, the core goal of "continuous equipment operation, reduced component wear, and reduced maintenance costs" is achieved, which is suitable for the efficient and stable industrial application requirements of scraped film evaporators.

[0029] refer to Figure 1 A pair of external threaded connectors 15 for heat medium are connected to the connecting pipe 2, and the external threaded connectors 15 are connected to the heat medium space formed by the connecting pipe 2 and the support pipe 1. This allows the pair of external threaded connectors 15 to serve as the inlet and outlet of the heat medium, respectively, realizing the circulation of the heat medium and meeting the requirements of continuous temperature control. The external threaded connectors are characterized by convenient installation and high sealing reliability. Compared with complex connection methods such as flanges, they do not require cumbersome tightening steps and can quickly complete the docking with the heat medium conveying pipeline, shortening the equipment assembly time.

[0030] refer to Figure 2A pair of round nuts 9 are positioned opposite each other on the top of the support tube 1, and a thrust washer 12 is connected between the two round nuts 9. The thrust washer 12 is used to prevent the two round nuts 9 from pushing against each other, so that a continuous axial preload is generated between the two round nuts 9, which greatly increases the friction between the threaded pairs. At the same time, it counteracts the tendency of the threads to "unlock" due to vibration and centrifugal force when the stirring shaft rotates at high speed, forming a double guarantee of "mechanical self-locking + frictional anti-loosening". Compared with locking with a single round nut 9, the anti-loosening effect is improved by one dimension.

[0031] refer to Figure 2 A washer 10 is connected between the second deep groove bearing 8 and the round nut 9. A retaining ring 11 is connected to the top of the washer 10. A retaining groove for cooperating with the retaining ring 11 is opened on the top of the inner wall of the support tube 1. The retaining ring 11 is embedded in the retaining groove. The top of the retaining ring 11 contacts the bottom of the round nut 9, and the bottom of the washer 10 contacts the top of the second deep groove bearing 8. The combination of the washer 10 and the retaining ring 11 can fill the assembly gap between the top of the second deep groove bearing 8 and the round nut 9, forming multiple layers of "physical barriers". This reduces the entry of external dust, water vapor or steam and material residue from the evaporator into the support tube 1 through the gap, and avoids contamination of bearing grease or corrosion of precision parts such as bearings and shafts.

[0032] refer to Figure 1 and Figure 3 The inner wall of the support tube 1 is provided with matching limiting grooves 14 corresponding to the positions of the first deep groove bearing 6, the thrust cylindrical roller bearing 7, and the second deep groove bearing 8. The outer ring sidewalls of the first deep groove bearing 6, the thrust cylindrical roller bearing 7, and the second deep groove bearing 8 are all tightly fitted with the inner walls of the corresponding limiting grooves 14 to achieve radial positioning. This makes the limiting grooves 14 form a surrounding protection for the outer ring of the bearing, which can prevent material residues, dust, and other impurities that may be generated during the operation of the scraped film evaporator from entering the gap between the bearing and the support tube 1, avoiding impurities from scratching the outer ring of the bearing or invading the bearing interior and wearing the balls and raceways. At the same time, this structure can reduce the impact of vibration on the outer ring of the bearing and reduce the relative wear between the outer ring of the bearing and the inner wall of the support tube 1. In addition, the limiting grooves 14 can prevent the bearing from being damaged by bumps during disassembly and assembly, further reducing the frequency of component replacement, reducing equipment maintenance costs and downtime.

[0033] refer to Figure 1 and Figure 4The top of the upper flange 3 has an annular groove 16, and an O-ring is installed in the groove 16. The O-ring is used to achieve a sealed connection between the upper flange 3 and the main structure of the scraped film evaporator. The O-ring has good elasticity and compression deformation ability. During assembly, the O-ring will produce uniform elastic deformation due to the clamping force between the upper flange 3 and the evaporator connection surface, filling the tiny gaps between the connection surfaces and forming an "elastic fit seal". Compared with a simple rigid flange connection, this sealing method has stronger adaptability. It can cope with normal temperature conditions and also adapt to the temperature fluctuations when the scraped film evaporator is working (the O-ring can be made of heat-resistant material), avoiding loosening and leakage of the sealing surface due to thermal expansion and contraction.

[0034] refer to Figures 1 to 5 The cover plate 5 has mounting holes and is fixed to the bottom of the support tube 1 with screws, forming a detachable connection with the support tube 1. The surface of the support tube 1 is fixed to the inner wall of the upper flange 3 and the lower flange 4 by welding, and the upper flange 3 and the lower flange 4 are installed on the scraped film evaporator by bolts and nuts. The integrated structure formed by welding allows the axial load borne by the support tube 1 to be evenly transferred to the evaporator body or the mounting foundation through the flanges, avoiding structural damage caused by local stress concentration. For example, the radial vibration load generated when the stirring shaft is running can be quickly transferred to the upper and lower flanges 4 through the support tube 1 and then distributed to the evaporator shell, reducing the local stress of the support tube 1 and improving the load-bearing capacity of the frame.

[0035] The implementation principle of this application embodiment is as follows: In implementation, the stirring shaft of the scraped film evaporator is inserted into the support tube 1 on the frame from top to bottom. Then, the first deep groove bearing 6 is sleeved on the bottom of the stirring shaft on the scraped film evaporator, so that the first deep groove bearing 6 drives the stirring shaft to embed into the limiting groove 14 at the bottom of the support tube 1. Then, the cover plate 5 is sleeved on and fixed to the bottom of the support tube 1 by screws. Then, the thrust cylindrical roller bearing 7 is sleeved on the upper end of the stirring shaft. Then, the second deep groove bearing 8, washer 10, snap ring 11, round nut 9, thrust washer 12 and round nut 9 are placed in sequence, so that the second deep groove bearing 8 and the thrust cylindrical roller bearing 7 are located in the limiting groove 14 at the top of the support tube. Then, the upper flange 3 and lower flange 4 connected to the support tube are fixedly connected to the scraped film evaporator by bolts and nuts. After fixing, the stirring shaft is started. During operation, the first deep groove bearing 6 is embedded in the support tube 1. The bottom of the inner wall of the support tube 1 bears the radial load of the bottom end of the stirring shaft, thus limiting the horizontal swing of the stirring shaft, ensuring the coaxiality of the stirring shaft, and avoiding vibration or wear caused by eccentricity during rotation. The thrust cylindrical roller bearing 7 bears the axial thrust generated by the contact pressure between the scraper and the inner wall of the evaporator during the film scraping process. At the same time, the resistance of the material may also generate axial force. The rolling friction reduces the damage of the axial force to the shaft system and avoids axial movement of the shaft. The second deep groove bearing 8 cooperates with the bottom first deep groove bearing 6 to further strengthen the radial support, forming "two-point radial positioning" to provide stable support for the stirring shaft during the stirring process, completely limiting the radial deviation of the stirring shaft, ensuring stability during high-speed rotation, and achieving high-precision and high-reliability support for the stirring shaft. This results in the advantages of continuous equipment operation, reduced component wear, and reduced maintenance costs.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dual-support frame for a scraped film evaporator, characterized in that, The device includes a support pipe (1), a connecting pipe (2), an upper flange (3), a lower flange (4), and a cover plate (5). The tops of the support pipe (1) and the connecting pipe (2) are connected to the upper flange (3). The connecting pipe (2) is sleeved on the surface of the support pipe (1). The bottoms of the connecting pipe (2) and the support pipe (1) are connected to the lower flange (4). The cover plate (5) is detachably connected to the bottom of the support pipe (1). The bottom of the inner wall of the support pipe (1) is provided with a first deep groove bearing (6) for supporting the bottom of the stirring shaft of the scraped film evaporator. The top of the inner wall of the support pipe (1) is provided with a thrust cylindrical roller bearing (7), a second deep groove bearing (8), and a pair of round nuts (9) for supporting the upper part of the stirring shaft of the scraped film evaporator. The second deep groove bearing (8) is located on top of the thrust cylindrical roller bearing (7), and the round nuts (9) are located on top of the second deep groove bearing (8).

2. The dual-support frame of a scraped film evaporator according to claim 1, characterized in that, A washer (10) is provided between the second deep groove bearing (8) and the round nut (9). A retaining ring (11) is provided on the top of the washer (10). The top of the retaining ring (11) contacts the bottom of the round nut (9), and the edge of the retaining ring (11) is embedded in the inner wall of the support tube (1).

3. The dual-support frame of a scraped film evaporator according to claim 1, characterized in that, A thrust washer (12) is provided between a pair of round nuts (9) to prevent them from pushing against each other, and the pair of round nuts (9) are arranged opposite to each other.

4. The dual-support frame of a scraped film evaporator according to claim 1, characterized in that, The top of the upper flange (3) is provided with an O-ring (13) for structural connection and sealing with the scraped film evaporator, and the top of the upper flange (3) is provided with a placement groove (16) for placing the O-ring (13).

5. The dual-support frame of a scraped film evaporator according to claim 1, characterized in that, The top and bottom of the support tube (1) are respectively provided with limiting grooves (14) for placing and limiting the first deep groove bearing (6), the second deep groove bearing (8) and the thrust cylindrical roller bearing (7). The outer ring sidewalls of the first deep groove bearing (6), the second deep groove bearing (8) and the thrust cylindrical roller bearing (7) are in contact with the inner wall of the limiting groove (14).

6. The dual-support frame of a scraped film evaporator according to claim 1, characterized in that, A heat medium containing space is formed between the pipe (2) and the support pipe (1), and a pair of heat medium external threaded joints (15) are connected to the pipe (2).

7. The dual-support frame of a scraped film evaporator according to claim 1, characterized in that, The cover plate (5) is detachably connected to the bottom of the support tube (1) by screws.

8. The dual-support frame of a scraped film evaporator according to claim 1, characterized in that, The surface of the support tube (1) is fixed to the inner wall of the upper flange (3) and the lower flange (4) by welding, and the upper flange (3) and the lower flange (4) are installed on the scraped film evaporator by bolts and nuts.

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