Double-helical-ribbon stirrer for high-viscosity reaction kettle

Abstract

The utility model provides a double-helical-ribbon stirrer for a high-viscosity reaction kettle, which comprises a barrel body, an end socket connected to the upper end of the barrel body, a motor arranged at the top of the end socket, a main shaft connected to the motor, the main shaft extending downwards into the barrel body, a support plate arranged at the bottom of the barrel body, and a flow guide hole arranged on the support plate, the lower end of the spindle is rotationally connected with the supporting plate, a double-helical-ribbon stirrer is arranged on the spindle, and a supporting frame is arranged on the lower portion of the double-helical-ribbon stirrer. Compared with the prior art, the utility model has the beneficial effects that the structure is simple, the cleaning is convenient, no dead angle exists in the barrel, the accumulation of polymers can be effectively reduced, the material stirring uniformity is ultrahigh, the double-helical-ribbon stirrer adopts a coarse pitch design principle, the running resistance is reduced, the accumulated materials are reduced, the shaft sticking rate is low, the maintenance frequency is reduced, and the utilization rate of equipment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of reactor stirring equipment, in particular to a double-ribbon stirrer for a high-viscosity reactor. Background Art

[0002] 107 silicone rubber, namely hydroxyl-terminated polydimethylsiloxane, is abbreviated as 107 glue, which is a colorless, transparent and viscous liquid with a viscosity between 2000 and 120000 MPa·s. The traditional 107 glue polymerization reaction uses a frame stirrer. When the polymerization reaction is carried out, the catalyst is mainly mixed and reacted by the stirrer to generate 107 glue. Due to the limitation of its structure, attention is paid to mechanical stiffness and compactness, while the mixing efficiency is ignored. Moreover, corners and "dead corners" are likely to appear during stirring, resulting in the material remaining in its gaps and "dead corners", affecting the next polymerization; due to the particularity of its structure, the problem of unstable stirring effect is likely to occur. Therefore, the structure of the frame stirrer can neither improve the mixing efficiency nor facilitate cleaning. Patent CN216260772U discloses a high-viscosity stirring device, which adopts a structure combining a ribbon stirrer and an anchor stirrer. However, only the top of the stirring shaft is fixed. When the equipment is running, due to the large viscosity of the material in the kettle, the generated torque increases. If the bottom is not fixed, the connection between the motor and the rotating shaft is likely to loosen or even be damaged, causing unnecessary maintenance. Summary of the Utility Model

[0003] In order to solve the above technical problems, the utility model provides a double-ribbon stirrer for a high-viscosity reactor, which has a simple structure, no dead corners inside the cylinder during use, can effectively reduce the accumulation of polymers, reduce the maintenance frequency, and improve the equipment utilization rate.

[0004] To achieve this technical purpose, the utility model adopts the following scheme:

[0005] A double-ribbon stirrer for a high-viscosity reactor includes a cylinder body. The upper end of the cylinder body is connected with a head. The top of the head is provided with a motor. The motor is connected with a main shaft. The main shaft extends downward into the cylinder body. The bottom of the cylinder body is provided with a support plate. The support plate is provided with a diversion hole. The lower end of the main shaft is rotatably connected with the support plate. The main shaft is provided with a double-ribbon stirrer. The lower part of the double-ribbon stirrer is provided with a support frame.

[0006] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0007] The utility model has a simple structure, is easy to clean, has no dead corners inside the cylinder, can effectively reduce the accumulation of polymers, has a very high uniformity of material stirring, adopts the design principle of large pitch for the double-ribbon stirrer, reduces the running resistance, reduces the accumulation of materials, has a low shaft seizure rate, reduces the maintenance frequency, and improves the equipment utilization rate.

[0008] Furthermore, a speed reducer is arranged between the motor and the main shaft. One end of the speed reducer is directly connected to the motor, and the other end of the speed reducer is connected to the main shaft through a coupling. The motor drives the main shaft to rotate.

[0009] Furthermore, a mechanical seal is arranged at the connection between the main shaft and the head to ensure the sealing performance inside the reaction kettle. A cage is arranged on the head. The upper end of the cage is connected to the speed reducer, which is used to support the stable installation of the speed reducer and the motor on the head and maintain its stability during stirring rotation.

[0010] Furthermore, the double spiral ribbon agitator is fixedly connected to the main shaft. The double spiral ribbon agitator is a blade structure of asymmetric diagonal double spirals, and the pitch of the double spiral ribbon agitator is 0.5 - 0.8 meters. This structure can adapt to materials with different viscosities and densities and make the mixing effect more uniform.

[0011] Furthermore, the support plate is fixed to the bottom of the cylinder body by bolts to ensure its stability. The diversion holes are opened on the support plate to prevent the catalyst from attaching under the support plate and causing uneven polymerization. The diversion holes are arranged at the four corners of the support plate, and the size is φ18mm.

[0012] Furthermore, a feed inlet is arranged at the top of the head, a discharge outlet is arranged at the bottom of the cylinder body, and a steam jacket is arranged outside the cylinder body. The working medium in the steam jacket is medium-pressure steam, which provides a high-temperature environment for the polymerization reaction. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the double spiral ribbon agitator for a high-viscosity reaction kettle according to an embodiment of the present utility model;

[0014] Figure 2 It is a schematic structural diagram of the support plate according to an embodiment of the present utility model;

[0015] The marks in the figure are: 1, motor; 2, speed reducer; 3, cage; 4, mechanical seal; 5, head; 6, main shaft; 7, cylinder body; 8, double spiral ribbon agitator; 9, support plate; 10, support frame; 11, diversion hole; 12, steam jacket. Detailed Embodiments

[0016] In order to fully understand the purpose, features and effects of the present utility model, the present utility model will be described in detail through the following specific embodiments, but the present utility model is not limited thereto.

[0017] See Figure 1 and Figure 2, an embodiment of the present utility model provides a double-ribbon agitator for a high-viscosity reactor, which includes a cylinder body 7. The upper end of the cylinder body 7 is connected with a head 5. The head 5 and the cylinder body 7 are connected by a flange. A motor 1 is arranged on the top of the head 5. The lower end of the motor 1 is directly connected with a speed reducer 2. The speed reducer 2 and a main shaft 6 are connected by a coupling. The main shaft 6 extends downward into the interior of the cylinder body 7. A mechanical seal 4 is arranged at the connection between the main shaft 6 and the head 5 to ensure the sealing of the whole structure. A cage 3 is arranged between the head 5 and the speed reducer 2. The two ends of the cage 3 are respectively connected with the head 5 and the speed reducer 2, which is used to support the stable installation of the speed reducer 2 and the motor 1 on the head 5 and maintain the structural stability during stirring rotation.

[0018] A double-ribbon agitator 8 is arranged in the middle of the main shaft 6. The double-ribbon agitator 8 is fixedly connected with the main shaft 6. The double-ribbon agitator 8 is a blade structure of an asymmetric diagonal double helix. The pitch of the double-ribbon agitator 8 is 0.5 - 0.8 meters. This structure can adapt to materials with different viscosities and densities and make the mixing effect more uniform. The lower part of the double-ribbon agitator 8 is a support frame 10, which is used to enhance the stability of the agitator and ensure no dead angle in stirring. The bottom of the cylinder body 7 is connected with a support plate 9 by bolts. φ18mm diversion holes 11 are arranged around the support plate 9 to prevent the catalyst from adhering to the lower part of the support plate 9, resulting in uneven polymerization. A bushing is arranged at the center of the support plate 9. The bushing is rotationally connected with the lower end of the main shaft 6. The support plate 9 provides strong support for the main shaft 6, enabling the main shaft 6 to maintain stability during rotation and reducing the equipment maintenance frequency.

[0019] A feed inlet is arranged on the top of the head 5. A discharge outlet is arranged at the bottom of the cylinder body 7. A steam jacket 12 is arranged outside the cylinder body 7. The working medium of the steam jacket 12 is medium-pressure steam, which provides a high-temperature environment for the polymerization reaction.

[0020] The components in contact with the material, such as the head 5, the cylinder body 7, the main shaft 6, the support plate 9, and the double-ribbon agitator 8, are all made of 304 stainless steel, which has high strength and good corrosion resistance and can avoid impurities in the material.

[0021] During operation, the material is pumped from the front-system metering tank into the double-ribbon agitator of the present utility model through a negative-pressure environment. The motor 1 and the speed reducer 2 are started to drive the main shaft 6 to rotate. The main shaft 6 drives the double-ribbon agitator 8 to rotate together. Feeding and stirring are carried out simultaneously. The support plate 9 provides strong support for the main shaft 6 to ensure its stable rotation. Medium-pressure steam medium is introduced into the steam jacket 12 to provide a high-temperature environment for the reaction. A catalyst is added for polymerization reaction under the action of high temperature. After the reaction is sufficient, it is discharged through a transfer pump and enters the next system.

[0022] Finally, it should be noted that: The above-listed are only the preferred embodiments of the present utility model. Of course, those skilled in the art can make changes and modifications to the present utility model. Provided that these modifications and variations fall within the scope of the claims of the present utility model and its equivalent technologies, they shall be regarded as within the protection scope of the present utility model.

Claims

1. A double-screw ribbon agitator for a high-viscosity reactor, comprising a barrel (7), the upper end of the barrel (7) being connected to a head (5), a motor (1) being arranged on the top of the head (5), a main shaft (6) being connected to the motor (1), and the main shaft (6) extending downward into the barrel (7), characterized in that: A support plate (9) is arranged at the bottom of the cylinder (7), a φ18 mm flow guide hole (11) is opened on the support plate (9), a shaft sleeve is arranged at the center of the support plate (9), the lower end of the main shaft (6) is rotatably connected to the shaft sleeve of the support plate (9), a double-screw agitator (8) is arranged in the middle of the main shaft (6), the double-screw agitator (8) is fixedly connected to the main shaft (6), the double-screw agitator (8) is an asymmetric diagonal double-screw blade structure, the pitch of the double-screw agitator (8) is 0.5-0.8 meters, and a support frame (10) is arranged at the bottom of the double-screw agitator (8) for enhancing the stability of the agitator and ensuring that there is no dead angle in the agitation.

2. The double-screw ribbon agitator for a high-viscosity reactor according to claim 1, characterized in that: A reducer (2) is arranged between the motor (1) and the main shaft (6); one end of the reducer (2) is connected to the motor (1), and the other end of the reducer (2) is connected to the main shaft (6) via a coupling.

3. The double-screw ribbon agitator for a high-viscosity reactor according to claim 2, characterized in that: An organic seal (4) is provided at the connection between the main shaft (6) and the head (5), a retaining frame (3) is provided on the head (5), and the retaining frame (3) is connected to the reducer (2).

4. The double-screw ribbon agitator for a high-viscosity reactor according to claim 1, characterized in that: A feed inlet is provided at the top of the sealing head (5), a discharge outlet is provided at the bottom of the cylinder (7), and a steam jacket (12) is provided outside the cylinder (7).

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