Anti-blocking silica sol concentration device

Abstract

The utility model belongs to the field of silica sol preparation, and relates to an anti-blocking silica sol concentration device which comprises a concentration tank, a concentration cavity is formed in the concentration tank, an ultrafiltration membrane is arranged in the concentration cavity, the concentration tank is provided with a feeding port, an air inlet and a discharging pipe which are communicated with the concentration cavity, and the air inlet is externally connected with a high-pressure air conveying tank; a scraping plate attached to the ultrafiltration membrane is movably arranged in the concentration cavity, a stirring shaft is rotationally arranged in the discharging pipe, a motor is fixed to the concentration tank, the motor drives the scraping plate to move along the surface of the ultrafiltration membrane through a first transmission mechanism, and the motor drives the stirring shaft to rotate in the discharging pipe through a second transmission mechanism. The silica sol concentration device has the advantages of reducing the risk of device blockage during silica sol concentration and the like.

Description

Technical Field

[0001] The present application belongs to the field of silica sol preparation and relates to an anti-clogging silica sol concentration device. Background Art

[0002] Silica sol concentration is one of the key steps in preparing high-concentration silica sol. The process involves evaporation, dehydration of the solution and further enlargement of silica sol particles. The following are the main methods for silica sol concentration:

[0003] Normal pressure (reduced pressure) constant liquid level evaporation concentration: This is a process of concentrating a solution and evaporating the solvent, while at the same time, small particles of silica sol continue to grow into large particles of silica sol;

[0004] Ultrafiltration concentration method: This is a concentration method of the physical dehydration process of the solution. When the particle size of the silica sol grows to a certain extent, the ultrafiltration device made of polymer membrane is used for physical dehydration. This method obtains large particles and high-concentration silica sol with uniform particle size, which is currently the most commonly used concentration method in industry.

[0005] The method of combining ultrafiltration and evaporation concentration: first remove a large amount of water from the dilute solution by ultrafiltration, and then remove the remaining water by evaporation. This method can not only prepare high-concentration silica sol, but also further increase the particle size of the silica sol to achieve a better concentration effect.

[0006] During the concentration process of silica sol, as the water evaporates, the silica sol particles may agglomerate and precipitate. These agglomerated particles may clog the pipes or filter membranes, causing the concentration device to be clogged, affecting normal use. Utility Model Content

[0007] In order to reduce the risk of clogging of the device during silica sol concentration, the present application provides an anti-clogging silica sol concentration device.

[0008] The anti-clogging silica sol concentration device provided in the present application adopts the following technical solution:

[0009] A blockage-resistant silica sol concentrating device comprises a concentrating tank, wherein a concentrating chamber is arranged in the concentrating chamber, an ultrafiltration membrane is arranged in the concentrating tank, a feed port, an air inlet and a discharge pipe which are connected with the concentrating chamber, the air inlet is externally connected with a high-pressure gas transmission tank, a scraper which is movably arranged in the concentrating chamber and is in contact with the ultrafiltration membrane, a stirring shaft is rotatably arranged in the discharge pipe, a motor is fixed to the concentrating tank, the motor drives the scraper to move along the surface of the ultrafiltration membrane through a first transmission mechanism, and the motor drives the stirring shaft to rotate in the discharge pipe through a second transmission mechanism.

[0010] By adopting the above technical scheme, the silica sol solution is added into the concentrating chamber of the concentrating tank through the feed port, and the high-pressure gas transmission tank inputs high-pressure gas into the concentrating chamber through the gas inlet, so that the silica sol solution is concentrated, the water is discharged through the ultrafiltration membrane, and the high-concentration silica sol is discharged through the discharge pipe. The motor drives the scraper to move through the transmission mechanism 1 to scrape off the silica sol on the surface of the ultrafiltration membrane, thereby reducing the risk of clogging of the ultrafiltration membrane. At the same time, the motor drives the stirring shaft to rotate through the transmission mechanism 2 to reduce the risk of clogging of the discharge pipe, thereby reducing the risk of clogging of the device when the silica sol is concentrated.

[0011] Preferably, the ultrafiltration membrane is arranged in the horizontal direction to separate the concentration chamber into an upper chamber and a lower chamber, the feed port, the air inlet, and the discharge pipe are all connected to the upper chamber, and the lower chamber is connected to the upper chamber through a return liquid pipe, and an electric valve 1 and a return liquid pump are provided in the return liquid pipe, and the concentrating device includes a controller connected to the electric valve 1 and the return liquid pump.

[0012] By adopting the above technical solution, during the concentration process of silica sol, as the water evaporates, the silica sol particles may agglomerate with each other and precipitate. When the silica sol concentration in the upper cavity is too high, it may cause damage to the scraper. At the same time, it also exceeds the predetermined concentration range. The controller can control the electric valve 1 and the return liquid pump to open, and the liquid in the lower cavity can be transported to the upper cavity, thereby reducing the silica sol concentration and avoiding damage to the scraper.

[0013] Preferably, the transmission mechanism includes a screw rod, which is rotatably arranged in the upper cavity and coaxially connected to the output shaft of the motor. The scraper includes a connecting rod and a scraper. The upper end of the connecting rod is provided with a threaded hole that cooperates with the thread of the screw rod. The lower end of the connecting rod is hinged to the scraper, and a torsion spring is arranged therebetween. The side wall of the scraper is slidably matched with the inner wall of the concentration chamber, and the lower end of the scraper is in contact with the upper surface of the ultrafiltration membrane.

[0014] By adopting the above technical solution, the motor drives the screw to rotate, so that the connecting rod moves along the length direction of the screw, and the scraper is used to scrape particles from the upper surface of the ultrafiltration membrane. Due to the provision of a torsion spring, when the particles adhered to the upper surface of the ultrafiltration membrane are difficult to scrape off, the torsion spring is deformed, thereby reducing the risk of damage to the scraper or the ultrafiltration membrane.

[0015] Preferably, the scraper is provided with an angle sensor for detecting the scraper's swing angle, and the angle sensor is connected to the controller.

[0016] By adopting the above technical solution, when the angle sensor detects that the scraper deflection angle exceeds the preset value, it means that the scraper encounters silica sol particles with strong adhesion and the concentration of silica sol water is too high. The controller sends an opening command to the electric valve 1 and the return liquid pump to make the liquid in the lower cavity flow back to the upper cavity, thereby reducing the silica sol concentration in the upper cavity.

[0017] Preferably, a connecting pipe connecting the upper cavity and the lower cavity is provided in the ultrafiltration membrane, an electric valve 2 is provided in the connecting pipe, the electric valve 2 is connected to the controller, and an electric valve 3 is provided in the discharge pipe.

[0018] By adopting the above technical solution, when the angle sensor detects that the scraper deflection angle exceeds the preset value, the electric valve three is closed, and after the liquid in the lower cavity flows back to the upper cavity for a certain period of time, the controller drives the electric valve two to open, so that the silica sol in the upper cavity flows into the lower cavity through the connecting pipe, instead of being discharged through the discharge pipe to affect the quality of the silica sol.

[0019] Preferably, the second transmission mechanism comprises a driving pulley, a transmission belt and a driven pulley, the driving pulley is coaxially fixed on the output shaft of the motor, the driven pulley is coaxially fixed on the stirring shaft, and the transmission belt is connected to the driving pulley and the driven pulley.

[0020] By adopting the above technical solution, the second motor drives the stirring shaft to rotate through the driving pulley, the transmission belt and the driven pulley, thereby reducing the risk of clogging of the discharge pipe.

[0021] Preferably, a stirring blade is fixed on the stirring shaft.

[0022] By adopting the above technical solution, after the stirring shaft is fixed with stirring blades, the stirring effect is improved.

[0023] Preferably, the high-pressure gas transmission tank is connected to an air compressor.

[0024] By adopting the above technical solution, after the high-pressure gas transmission tank is connected to the air compressor, high-pressure gas can be continuously delivered to the high-pressure gas transmission tank.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. The motor drives the scraper to move through the transmission mechanism 1 to scrape off the silica sol on the surface of the ultrafiltration membrane, reducing the risk of ultrafiltration membrane clogging. The motor drives the stirring shaft to rotate through the transmission mechanism 2 to reduce the risk of discharge pipe clogging and reduce the risk of device clogging when the silica sol is concentrated;

[0027] 2. When the concentration of silica sol in the upper cavity is too high, the controller controls the electric valve 1 and the liquid return pump to open, and transports the liquid in the lower cavity to the upper cavity, thereby reducing the concentration of silica sol and avoiding damage to the scraper. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application.

[0029] Figure 2 yes Figure 1 sectional view of .

[0030] Figure 3 yes Figure 2 Sectional view of part A.

[0031] Figure 4 yes Figure 2 Sectional view of part B.

[0032] Explanation of the reference numerals in the accompanying drawings: 1. Concentration tank; 11. Upper cavity; 12. Lower cavity; 13. Feed port; 14. Air inlet; 15. Discharge pipe; 151. Horizontal pipe; 152. Vertical pipe; 16. Electric valve three; 2. Ultrafiltration membrane; 21. Connecting pipe; 22. Electric valve two; 3. High-pressure gas transmission tank; 31. Air compressor; 4. Scraper; 41. Connecting rod; 42. Scraper; 43. Torsion spring; 44. Angle sensor; 5. Stirring shaft; 51. Stirring blade; 6. Transmission mechanism one; 61. Screw; 7. Liquid return pipe; 71. Electric valve one; 72. Liquid return pump; 8. Transmission mechanism two; 81. Driving pulley; 82. Transmission belt; 83. Driven pulley; 9. Motor. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-4 This application is described in further detail.

[0034] like Figure 1 , Figure 2 As shown, the silica sol concentrating device includes a concentrating tank 1, a concentrating chamber is arranged in the concentrating tank 1, and an ultrafiltration membrane 2 is arranged in the concentrating chamber. In this embodiment, the ultrafiltration membrane 2 is arranged in the horizontal direction to divide the concentrating chamber into an upper chamber 11 and a lower chamber 12. The concentrating tank 1 is provided with a feed port 13, an air inlet 14 and a discharge pipe 15 connected to the upper chamber 11. The air inlet 14 is externally connected to a high-pressure gas tank 3. In this embodiment, the high-pressure gas tank 3 is connected to an air compressor 31, which can continuously transport high-pressure gas to the high-pressure gas tank 3. The high-pressure gas tank 3 transports high-pressure gas to the upper chamber 11. The silica sol solution flows into the upper chamber 11 through the feed port 13. Under the action of the high-pressure gas, water flows into the lower chamber 12 through the ultrafiltration membrane 2. The silica sol concentration in the upper chamber 11 gradually increases and is discharged from the discharge pipe 15 to the outside of the upper chamber 11.

[0035] like Figure 2 , Figure 3 As shown, a scraper 4 is movably provided in the concentration chamber and is in contact with the ultrafiltration membrane 2. A stirring shaft 5 is rotatably provided in the discharge pipe 15. A motor 9 is fixed to the concentration tank 1. The motor 9 drives the scraper 4 to move along the surface of the ultrafiltration membrane 2 through a transmission mechanism 6.

[0036] In this embodiment, the transmission mechanism 6 includes a screw rod 61, which is rotatably arranged in the upper cavity 11 and coaxially connected to the output shaft of the motor 9. The scraper 4 is arranged in the vertical direction and includes a connecting rod 41 and a scraper 42. The upper end of the connecting rod 41 is provided with a threaded hole that matches the thread of the screw rod 61.

[0037] The motor 9 moves to drive the screw 61 to rotate, so that the scraper 4 moves along the surface of the ultrafiltration membrane 2 .

[0038] As another solution, the scraper 4 can be arranged in the horizontal direction, and the transmission mechanism 6 includes a rotating shaft and a gear set. One end of the scraper 4 is connected to the rotating shaft. The rotating shaft is arranged in the vertical direction and connected to the motor 9 through the gear set. The motor 9 drives the scraper 4 to swing around the rotating shaft.

[0039] Preferably, the lower end of the connecting rod 41 is hinged to the scraper 42, and a torsion spring 43 is provided therebetween. The side wall of the scraper 42 is slidably matched with the inner wall of the concentration chamber, and the lower end of the scraper 42 is in contact with the upper surface of the ultrafiltration membrane 2. The scraper 42 is provided with an angle sensor 44 for detecting the swing angle of the scraper 42, and the angle sensor 44 is connected to the controller.

[0040] like Figure 2 , Figure 3 As shown, the lower cavity 12 is connected to the upper cavity 11 through the liquid return pipe 7, and the liquid return pipe 7 is provided with an electric valve 71 and a liquid return pump 72, and the electric valve 71 and the liquid return pump 72 are both connected to the controller.

[0041] When the angle sensor 44 detects that the deflection angle of the scraper 42 exceeds the preset value, it means that the scraper 42 encounters strongly adhered silica sol particles and the concentration of silica sol water is too high. The controller sends an opening command to the electric valve 71 and the return liquid pump 72 to make the liquid in the lower cavity 12 flow back to the upper cavity 11, thereby reducing the silica sol concentration in the upper cavity 11.

[0042] like Figure 2 , Figure 4 As shown, a connecting pipe 21 connecting the upper cavity 11 and the lower cavity 12 is provided in the ultrafiltration membrane 2, an electric valve 22 is provided in the connecting pipe 21, and the electric valve 22 is connected to the controller. An electric valve 3 16 is provided in the discharge pipe 15.

[0043] In this embodiment, the ultrafiltration membrane 2 can be:

[0044] 1. Polysulfone ultrafiltration membrane 2: Polysulfone is a polymer material with excellent chemical stability and thermal stability. The ultrafiltration membrane 2 made of polysulfone has high retention performance and flux, and is suitable for the concentration of silica sol;

[0045] 2. Polyvinylidene fluoride ultrafiltration membrane 2: Polyvinylidene fluoride ultrafiltration membrane 2 has excellent chemical corrosion resistance and mechanical strength, can operate stably in relatively harsh environments, and is suitable for the concentration and separation of silica sol;

[0046] 3. Polyethersulfone ultrafiltration membrane 2: Polyethersulfone ultrafiltration membrane 2 has good hydrophilicity and anti-pollution properties, and can effectively prevent pollutants in the silica sol from depositing on the membrane surface, thereby maintaining a high flux and retention performance.

[0047] When the angle sensor 44 detects that the deflection angle of the scraper 42 exceeds a preset value, the electric valve three 16 is closed, and the liquid in the lower cavity 12 flows back to the upper cavity 11 for a certain period of time. Then, the controller drives the electric valve two 22 to open, so that the silica sol in the upper cavity 11 flows into the lower cavity 12 through the connecting pipe 21.

[0048] like Figure 2 , Figure 4 As shown, the motor 9 drives the stirring shaft 5 to rotate in the discharge pipe 15 through the transmission mechanism 8, and a stirring blade 51 is fixed on the stirring shaft 5.

[0049] In this embodiment, the transmission mechanism 2 8 includes a driving pulley 81, a transmission belt 82 and a driven pulley 83. The driving pulley 81 is coaxially fixed on the output shaft of the motor 9, and the driven pulley 83 is coaxially fixed on the stirring shaft 5. The transmission belt 82 is connected to the driving pulley 81 and the driven pulley 83.

[0050] As another solution, the transmission mechanism 2 8 can also be set as a bevel gear set, and the stirring shaft 5 is connected to the output shaft of the motor 9 through the bevel gear set, and the motor 9 drives the stirring shaft 5 to rotate through the bevel gear set.

[0051] In this embodiment, the discharge pipe 15 includes a horizontal pipe 151 and a vertical pipe 152. The stirring shaft 5 is arranged at the connection between the horizontal pipe 151 and the vertical pipe 152. The electric valve 16 is arranged in the vertical pipe 152. The stirring shaft 5 will not interfere with the electric valve, and the silica sol in the vertical pipe 152 is not easy to be blocked under the action of gravity.

[0052] The working principle of this embodiment is as follows: the silica sol solution is added to the concentration chamber of the concentration tank 1 through the feed port 13, and the high-pressure gas tank 3 inputs high-pressure gas into the concentration chamber through the air inlet 14 to concentrate the silica sol solution, and the water is discharged through the ultrafiltration membrane 2, and the high-concentration silica sol is discharged through the discharge pipe 15. The motor 9 drives the scraper 4 to move through the transmission mechanism 16 to scrape off the silica sol on the surface of the ultrafiltration membrane 2, thereby reducing the risk of clogging of the ultrafiltration membrane 2. At the same time, the motor 9 drives the stirring shaft 5 to rotate through the transmission mechanism 2 8 to reduce the risk of clogging of the discharge pipe 15, thereby reducing the risk of clogging of the device during silica sol concentration. When the silica sol concentration in the upper cavity 11 is too high, the scraper 4 may be damaged, and it also exceeds the predetermined concentration range. The controller can control the electric valve 171 and the return liquid pump 72 to open, and the liquid in the lower cavity 12 is transported to the upper cavity 11 to reduce the silica sol concentration and avoid damage to the scraper 4.

[0053] 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. A blockage-resistant silica sol concentration device, characterized in that: The invention comprises a concentration tank (1), wherein a concentration chamber is arranged in the concentration tank (1), an ultrafiltration membrane (2) is arranged in the concentration chamber, the concentration tank (1) is provided with a feed port (13), an air inlet (14) and a discharge pipe (15) which are communicated with the concentration chamber, the air inlet (14) is externally connected to a high-pressure gas transmission tank (3), a scraper (4) which is movably arranged in contact with the ultrafiltration membrane (2) is arranged in the concentration chamber, a stirring shaft (5) is rotatably arranged in the discharge pipe (15), a motor (9) is fixed to the concentration tank (1), the motor (9) drives the scraper (4) to move along the surface of the ultrafiltration membrane (2) through a transmission mechanism 1 (6), and the motor (9) drives the stirring shaft (5) to rotate in the discharge pipe (15) through a transmission mechanism 2 (8).

2. The anti-clogging silica sol concentration device according to claim 1, characterized in that: The ultrafiltration membrane (2) is arranged in the horizontal direction to divide the concentration chamber into an upper chamber (11) and a lower chamber (12); the feed port (13), the air inlet (14), and the discharge pipe (15) are all connected to the upper chamber (11); the lower chamber (12) is connected to the upper chamber (11) via a liquid return pipe (7); an electric valve (71) and a liquid return pump (72) are provided in the liquid return pipe (7); and the concentration device includes a controller connected to the electric valve (71) and the liquid return pump (72).

3. The anti-clogging silica sol concentration device according to claim 2, characterized in that: The transmission mechanism 1 (6) comprises a screw rod (61), the screw rod (61) is rotatably arranged in the upper cavity (11) and is coaxially connected to the output shaft of the motor (9), the scraper (4) comprises a connecting rod (41) and a scraper (42), the upper end of the connecting rod (41) is provided with a threaded hole that is threadedly matched with the screw rod (61), the lower end of the connecting rod (41) is hinged to the scraper (42), and a torsion spring (43) is arranged therebetween, the side wall of the scraper (42) is slidably matched with the inner wall of the concentration chamber, and the lower end of the scraper (42) is in contact with the upper surface of the ultrafiltration membrane (2).

4. The anti-clogging silica sol concentration device according to claim 3, characterized in that: The scraper (42) is provided with an angle sensor (44) for detecting the swing angle of the scraper (42), and the angle sensor (44) is connected to the controller.

5. The anti-clogging silica sol concentration device according to claim 4, characterized in that: The ultrafiltration membrane (2) is provided with a connecting pipe (21) connecting the upper cavity (11) and the lower cavity (12), the connecting pipe (21) is provided with an electric valve 2 (22), the electric valve 2 (22) is connected to the controller, and the discharge pipe (15) is provided with an electric valve 3 (16).

6. The anti-clogging silica sol concentration device according to claim 5, characterized in that: The second transmission mechanism (8) comprises a driving pulley (81), a transmission belt (82) and a driven pulley (83); the driving pulley (81) is coaxially fixed to the output shaft of the motor (9); the driven pulley (83) is coaxially fixed to the stirring shaft (5); and the transmission belt (82) is connected to the driving pulley (81) and the driven pulley (83).

7. The anti-clogging silica sol concentration device according to claim 6, characterized in that: A stirring blade (51) is fixed on the stirring shaft (5).

8. The anti-clogging silica sol concentration device according to claim 6, characterized in that: The high-pressure gas transmission tank (3) is connected to an air compressor (31).

Images