Multi-batch mixing system for polyimide stock solution
By designing the feeding circulation component and the stirring component, the problems of uneven mixing and difficult temperature control in the multi-batch mixing system of polyimide stock solution were solved, achieving efficient mixing effect and temperature management, and improving product quality and production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-03-27
AI Technical Summary
Existing multi-batch mixing systems for polyimide stock solutions suffer from uneven mixing and difficulty in temperature control during the stirring process, resulting in low product quality and low production efficiency.
The system employs a feeding circulation assembly and a stirring assembly, including a feed coil, a reducing pipe, a three-way valve, a stirring paddle, a jacket, and a temperature sensor. Through multiple batches of raw liquid circulation and stirring, as well as temperature control, it ensures uniform mixing and temperature stability.
This improved the mixing uniformity and temperature control accuracy of the polyimide stock solution, thereby enhancing product quality and production efficiency.
Smart Images
Figure CN224040670U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to spinning equipment technical field especially relates to a kind of for polyimide stock solution multi-batch mixing system. BACKGROUND
[0002] The industrial production of polyimide fibers usually requires large quantities of stock solution supply. If the yield of a single batch of stock solution is insufficient to meet the requirements of subsequent processing and production, mixing multiple batches can provide sufficient stock solution to avoid production interruptions. The synthesis of polyimide stock solution involves complex chemical reactions, and small differences may exist between different batches of stock solution, leading to fluctuations in the performance parameters of the stock solution. By mixing multiple batches of stock solution, these differences can be balanced to ensure the uniformity and stability of the final stock solution.
[0003] Conventional polyimide stock solution multi-batch mixing systems have problems such as high stock solution viscosity, temperature control during stirring, design of stirring paddles, and stirring speed control, which result in insufficient disturbance between the upper and lower layers of the stock solution during mixing, low overall mixing uniformity, poor viscosity uniformity, and impact on product quality and production efficiency. SUMMARY
[0004] The utility model aims at the above-mentioned insufficient of prior art, proposes a kind of for polyimide stock solution multi-batch mixing system.
[0005] The utility model relates to a kind of for polyimide stock solution multi-batch mixing system, including kettle body, stirring assembly and feeding circulation component, the stirring assembly includes driving part and stirring paddle, one end of the stirring paddle is arranged in the kettle body, and the other end extends out of the kettle body and is connected with the driving part, the feeding circulation component includes feed coil pipe, variable diameter pipe and tee valve, the feed coil pipe is sleeved on the outer periphery of the middle part of the kettle body, and is connected with the kettle body by the variable diameter pipe, and the variable diameter pipe is at least 2 pairs;The first interface of the tee valve is connected with the feed coil pipe by circulating feeding pipe, the second interface of the tee valve is connected with the discharge valve arranged at the bottom of the kettle body by circulating discharge pipe, a delivery pump is arranged on the circulating discharge pipe, and a discharge pipe is arranged on the third interface of the tee valve;The upper end of the kettle body is also provided with a feeding pipe;The kettle body is provided with a jacket, a water inlet valve and a water outlet valve are arranged on the jacket;The kettle body is also provided with a temperature sensor for detecting the temperature of the internal liquid.
[0006] Further, the feed coil pipe is located at 1 / 2 of the kettle body and includes 3 pairs of variable diameter pipes. The variable diameter pipes are arranged at equal angles, and the axis of each pair of variable diameter pipes is on the same straight line, and the straight line passes through the horizontal center point of the kettle body.
[0007] Further, the diameter of the end of the variable-diameter material pipe connected with the kettle body is 1:3-6 times the diameter of the end connected with the feed pipe.
[0008] Further, the stirring paddle comprises a stirring shaft and double helical stirring blades arranged on the stirring shaft.
[0009] Further, the stirring paddle further comprises a shaft stirring blade arranged at the lower end of the stirring shaft.
[0010] Further, the stirring assembly further comprises a scraper arranged on the stirring shaft, and the outer end of the scraper is in contact with the inner wall of the kettle body.
[0011] Further, the bottom of the kettle body is further provided with a liquid level variator.
[0012] Further, the circulating material pipe is provided with a pressure transmitter.
[0013] Further, the feed pipe is provided with two feed ports, and the two feed ports are symmetrically arranged on the same straight line with the center point of the feed pipe as the symmetric center and are connected with the first interface of the three-way valve.
[0014] Further, the driving member is a variable-frequency speed-regulating motor.
[0015] In the utility model, the mixed stock solution enters the kettle body through the feed pipe, and after the stock solution at the lower part of the kettle body is transported to the feed pipe at the middle part of the kettle body through the feeding and circulating assembly, the stock solution enters the kettle through the multiple variable-diameter material ports, so that multiple batches of stock solutions are fully stirred up and down in the mixing kettle, and the overall mixing uniformity is improved.
[0016] The utility model reaches the balance between the stirring mixing effect and the mechanical heat through controlling the stirring speed, and the mechanical heat generated by the kettle body stirring is exchanged with the cooling water in the jacket, so that the temperature of the mixed stock solution is always kept at the process requirement.
[0017] The double helical stirring blades can produce axial flow and radial flow for mixing high-viscosity stock solutions, and the double helical stirring blades can form gentle shearing mixing for the shearing-sensitive mixed stock solution; the shaft stirring blade can realize axial and radial flow mixing in the middle part of the double helical stirring paddle, the scraper can scrape the mixed stock solution adhered to the inner wall of the kettle body during the stirring process, and the scraper works cooperatively with the stirring paddle to enhance the stirring effect, destroy the vortex, and fully mix the mixed stock solution. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is a structural schematic view of a polyimide stock solution multi-batch mixing system.
[0019] Figure 2 This is a schematic diagram of the feed coil structure.
[0020] 1. Reactor body; 11. Discharge valve; 12. Feed pipe; 2. Stirring assembly; 21. Drive unit; 22. Stirring paddle; 221. Stirring shaft; 222. Double spiral ribbon stirring blade; 223. Shaft-mounted stirring blade; 23. Scraper; 3. Feeding and circulation assembly; 31. Feeding coil; 311. Feed inlet; 32. Variable diameter feed pipe; 33. Three-way valve; 4. Circulating feed pipe; 5. Circulating discharge pipe; 51. Conveying pump; 52. Pressure transmitter; 6. Discharge pipe; 7. Jacket; 71. Water inlet valve; 72. Water outlet valve; 8. Temperature sensor; 9. Liquid level gauge; 10. Ball valve. Detailed Implementation
[0021] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0022] like Figure 1 As shown, this utility model discloses a multi-batch mixing system for polyimide stock solution, comprising a vessel body 1, a stirring assembly 2, and a feeding and circulation assembly 3. The stirring assembly 2 includes a drive component 21 and a stirring paddle 22. One end of the stirring paddle 22 is disposed inside the vessel body 1, and the other end extends out of the vessel body 1 and is connected to the drive component 21 for transmission. The feeding and circulation assembly 3 includes a feed coil 31, a variable diameter feed pipe 32, and a three-way valve 33. The feed coil 31 is sleeved on the outer periphery of the middle part of the vessel body 1 and is connected to the vessel body 1 through the variable diameter feed pipe 32. The variable diameter feed pipe 32... There are at least two pairs; the first port of the three-way valve 33 is connected to the feed coil 31 through the circulating feed pipe 4, the second port of the three-way valve 33 is connected to the discharge valve 11 located at the bottom of the vessel body 1 through the circulating discharge pipe 5, the circulating discharge pipe 5 is equipped with a conveying pump 51, and the third port of the three-way valve 33 is equipped with a discharge pipe 6; the upper end of the vessel body 1 is also equipped with a feed pipe 12; the vessel body 1 is equipped with a jacket 7, and the jacket 7 is equipped with a water inlet valve 71 and a water outlet valve 72; the vessel body 1 is also equipped with a temperature sensor 8 for detecting the internal liquid temperature.
[0023] In this invention, the mixed raw liquid enters the vessel body 1 through the feed pipe 12. The raw liquid in the lower part of the vessel body 1 is transported to the feed coil 31 located in the middle of the vessel body 1 through the feeding circulation component 3, and then enters the mixing vessel through multiple variable diameter feed ports, so that multiple batches of raw liquid are fully stirred in the mixing vessel, thereby improving the overall mixing uniformity.
[0024] This invention achieves a balance between the mixing effect and the heat generated by the stirring machinery by controlling the stirring speed. The cooling water in the jacket 7 exchanges heat with the mechanical heat generated by stirring in the vessel body 1, so that the temperature of the mixed raw liquid is always maintained at the process requirements.
[0025] The water inlet valve 71 and the water outlet valve 72 of the kettle body 1 are opened, and cooling water is filled to exchange heat with the mechanical heat generated by stirring in the kettle body 1, and the temperature sensor 8 is monitored to keep the temperature of the mixed raw liquid in the kettle body 1 within the process requirement range.
[0026] In order to improve the mixing effect, the feeding coil 31 can be located at 1 / 2 of the kettle body 1, and includes three pairs of variable-diameter pipes 32, the variable-diameter pipes 32 are arranged at equal angles, and the axes of each pair of variable-diameter pipes 32 are on the same straight line, and the straight line passes through the horizontal center point of the kettle body 1.
[0027] The diameter of the one end of the variable-diameter pipe 32 connected with the kettle body 1 is 1:3-6 compared with the diameter of the one end connected with the feeding coil 31, so that the pressure value of the circulating discharge pipe 5 is kept between 0.2-0.3 Mpa, and the raw liquid entering the kettle body 1 does not appear to be gathered.
[0028] The structure of the stirring paddle 22 is various, in the embodiment, the stirring paddle 22 can include a stirring shaft 221 and double helical ribbon stirring blades 222 arranged on the stirring shaft 221. The stirring paddle 22 further includes a shaft stirring blade 223 arranged at the lower end of the stirring shaft 221. The stirring assembly 2 can further include a scraper 23 arranged on the stirring shaft 221, and the outer end of the scraper 23 is in contact with the inner wall of the kettle body 1. The double helical ribbon stirring blades 222 can generate axial flow and radial flow for mixing high-viscosity raw liquid, and the double helical ribbon stirring blades 222 can form gentle shear mixing for shear-sensitive mixed raw liquid. The shaft stirring blade 223 can realize axial and radial flow mixing in the middle part of the double helical ribbon stirring paddle 22, and the scraper 23 can scrape the mixed raw liquid adhered to the inner wall of the kettle body 1 during stirring, and cooperates with the stirring paddle 22 to enhance the stirring effect, destroy the formed vortex, and fully mix the mixed raw liquid.
[0029] The bottom of the kettle body 1 can be further provided with a liquid level transmitter 9, the mixed raw liquid enters the kettle body 1 through the feeding pipe 12, and the amount of the raw liquid in the kettle body 1 is controlled by the liquid level transmitter.
[0030] The circulating discharge pipe 5 can be further provided with a pressure transmitter 52 for monitoring the pressure value of the circulating discharge pipe 5.
[0031] The feeding coil 31 can be provided with two feeding ports 311, and the two feeding ports 311 are connected with the first interface of the three-way valve 33, and the two feeding ports 311 are symmetrically arranged on the same straight line with the center point of the feeding coil 31 as the symmetric center.
[0032] The driving member 21 can be a variable frequency speed regulation motor, which controls the stirring speed to balance the stirring mixing effect and the mechanical heat.
[0033] The discharge valve 11 arranged at the bottom of the kettle body 1 can be a downward discharge valve 11 to prevent the accumulation of materials at the bottom of the mixing kettle.
[0034] The conveying pump 51 arranged on the circulating feeding pipe 5 can be a gear conveying pump.
[0035] For convenient control, ball valves can be arranged on the feeding pipe 12, the discharging pipe 6 and the circulating feeding pipe 4.
[0036] The above-mentioned parts not involved in the description are applicable to the prior art.
[0037] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood that the above examples are only for illustration and are not intended to limit the scope of the present application. Those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the direction of the present application or exceed the scope defined by the appended claims. Those skilled in the art should understand that any modification, equivalent replacement, improvement, etc. made according to the technical essence of the present application to the above embodiments shall be included in the protection scope of the present application.
Claims
1. A polyimide dope multi-batch mixing system, characterized by: The utility model relates to a kind of kettle, including kettle body (1), stirring assembly (2) and feeding circulation assembly (3), the stirring assembly (2) includes driving part (21) and stirring paddle (22), one end of the stirring paddle (22) is arranged in the kettle body (1), the other end is out of the kettle body (1) and driving part (21) transmission connection, the feeding circulation assembly (3) includes feed coil pipe (31), variable diameter pipe (32) and tee valve (33), the feed coil pipe (31) is sleeved in the middle outer periphery of the kettle body (1), and is connected with the kettle body (1) by the variable diameter pipe (32), the variable diameter pipe (32) is at least 2 pairs;The first interface of the tee valve (33) is connected with the feed coil pipe (31) by circulation feeding pipe (4), the second interface of the tee valve (33) is connected with the discharge valve (11) arranged in the bottom of the kettle body (1) by circulation discharging pipe (5), and conveying pump (51) is arranged on the circulation discharging pipe (5), the third interface of the tee valve (33) is equipped with discharge pipe (6);The upper end of the kettle body (1) is also equipped with feed pipe (12);The kettle body (1) is equipped with jacket (7) outside, and the jacket (7) is equipped with water inlet valve (71) and water outlet valve (72);The kettle body (1) is also equipped with temperature sensor (8) for detecting the temperature of internal liquid.
2. The polyimide stock solution multi-batch mixing system of claim 1, wherein: The feed coil pipe (31) is located at 1 / 2 of the kettle body (1), including 3 pairs of variable diameter pipe (32), the variable diameter pipe (32) is arranged at equal angle, and the axis of each pair of variable diameter pipe (32) is on the same straight line, and the straight line passes through the horizontal center point of the kettle body (1).
3. The polyimide stock solution multi-batch mixing system of claim 1, wherein: The caliber of the end of the variable diameter pipe (32) connected with kettle body (1) is 1:3-6 compared with the caliber of the end connected with feed coil pipe (31).
4. The polyimide stock solution multi-batch mixing system of claim 1, wherein: The stirring paddle (22) includes stirring shaft (221) and double helical ribbon stirring blade (222) arranged on the stirring shaft (221).
5. The polyimide stock solution multi-batch mixing system of claim 4, wherein: The stirring paddle (22) further includes around shaft stirring blade (223) arranged at the lower end of the stirring shaft (221).
6. The polyimide stock solution multi-batch mixing system of claim 4, wherein: The stirring assembly (2) further includes scraper (23) arranged on the stirring shaft (221), and the outer end of the scraper (23) is in contact with the inner wall of the kettle body (1).
7. The polyimide stock solution multi-batch mixing system according to any one of claims 1-6, wherein: The bottom of the kettle body (1) is further equipped with liquid level variator (9).
8. The polyimide stock solution multi-batch mixing system according to any one of claims 1-6, wherein: The circulation discharging pipe (5) is equipped with pressure transmitter (52).
9. The polyimide stock solution multi-batch mixing system according to any one of claims 1-6, wherein: The feed coil pipe (31) is provided with two feed ports (311), and the two feed ports (311) are connected with the first interface of the tee valve (33), and the two feed ports (311) are symmetrically arranged on the same straight line with the center point of the feed coil pipe (31) as the symmetric center.
10. The polyimide stock solution multi-batch mixing system according to any one of claims 1-6, wherein: The driving part (21) is variable frequency speed regulation motor.