Carbon fiber spinning solution distribution pipe based on microchannel

Abstract

The utility model discloses a carbon fiber spinning solution distribution pipe based on a microchannel, and belongs to the technical field of carbon fiber production equipment. Separating and combining type micro-channels are arranged on the six inner wall faces of the pipeline respectively, the inclination angles of the branch positions are 30 degrees, 45 degrees, 60 degrees and 90 degrees, due to the fact that the branch structures can damage the original flowing condition of fluid in the micro-channels, and the flow speed can be changed due to changes of the path size, the fluid can generate vortexes at the branch positions of the micro-channels, the fluid disturbance degree is increased, and the fluid flow rate is increased. Compared with an original pipeline, the problem of fluid retention can be effectively relieved; the hot water jacket is sleeved outside the pipeline, the temperature of the stock solution is increased through heat transfer, and along with the rise of the temperature, the thermal motion of molecules is intensified, and the interaction force between molecular chains is weakened, so that the viscosity of the precursor solution is reduced, and the adverse effect caused by high-viscosity fluid can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of carbon fiber production equipment, and in particular relates to a carbon fiber spinning solution distribution pipe based on a microchannel. Background Art

[0002] Carbon fiber has excellent properties such as high strength, high temperature resistance, and corrosion resistance. It is widely used in aerospace, sporting goods, wind power generation and other fields. In the process of preparing carbon fiber, the core process sections involved are polymerization, spinning, pre-oxidation, carbonization and so on. The polymerization process is a free radical polymerization. The monomer free radicals and olefin monomers (such as acrylonitrile) are chain-polymerized. The molecular chains of the polymerization products become longer and longer, and the molecular chains are easily entangled, and finally a high molecular weight polyacrylonitrile (PAN) is obtained. Because the molecular chains are very long, a pseudo-net-like entanglement structure is easily formed inside, resulting in a generally large viscosity of the polymer and a very slow flow rate in the pipeline. The Reynolds number Re≤0.1 is a creep flow, which affects production efficiency. At the same time, dead zones are easily formed in the conveying pipeline, which will cause the residence time of the raw liquid in the coagulation bath to be different, and it is very easy for the performance of the produced tow to be different. Summary of the Invention

[0003] The utility model mainly solves the technical problems existing in the above-mentioned prior art and provides a carbon fiber spinning solution distribution tube based on a microchannel.

[0004] The above technical problems of the present invention are mainly solved by the following technical solutions: a microchannel-based carbon fiber spinning solution distribution pipe, including a main pipe, which is a hexagonal pipe. The main pipe branches out a first branch pipe and a third branch pipe to the left and right sides respectively, and branches out a second branch pipe downward. The first branch pipe branches out a first branch and a third branch to the left and right sides respectively, and branches out a second branch downward. The pipe length of the second branch is the same as the horizontal length of the first branch pipe and the third branch pipe; the inner pipe walls of the main pipe, branch pipe and branch are all annularly arranged with split and combined microchannels.

[0005] Preferably, the exteriors of the main pipe, the first branch pipe, the second branch pipe, the third branch pipe, the first branch pipe, the second branch pipe and the third branch pipe are all jacketed with hot water jackets.

[0006] Preferably, the split-and-combine microchannel includes a first channel consisting of two trapezoids arranged in opposite directions and a second channel consisting of two trapezoids arranged in forward directions. A converging channel is formed between the first channel and the second channel, so the angle of the converging channel is J, the width of the first channel is W1, the width of the second channel is W2, the first channel and the second channel are aligned up and down and arranged in sequence along the pipe diameter, the length of the first channel is H1, and the length of the second channel is H2.

[0007] Preferably, W1 is 3mm-4mm, W2 is 1mm-2mm, H1 is 6mm-7mm, and H2 is 13mm-15mm.

[0008] Preferably, the length of the second branch pipe is the same as that of the first branch pipe and the third branch pipe; and the branching structure of the second branch pipe and the third branch pipe is the same as that of the first branch pipe.

[0009] The J tilt angles include four types: 30°, 45°, 60°, and 90°.

[0010] The utility model has the beneficial effects:

[0011] Splitting and combining microchannels are arranged on the six inner walls of the pipeline, with four inclination angles at the branches: 30°, 45°, 60°, and 90°. Because the branching structure disrupts the original flow of the fluid in the microchannel, changes in the path size will change the flow rate, so the fluid will generate vortices at the microchannel branches, increasing the degree of fluid disturbance. Compared with the original pipeline, it can effectively alleviate the problem of fluid retention.

[0012] A hot water jacket is installed on the outside of the pipeline to increase the temperature of the raw liquid through heat transfer. As the temperature rises, the molecular thermal motion intensifies, the interaction force between molecular chains weakens, and the viscosity of the raw silk liquid decreases, which can reduce the adverse effects of high-viscosity fluids. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a structural schematic diagram of the split-and-combined microchannel of the utility model.

[0015] In the figure: 1, main pipe; 2, first branch pipe; 3, third branch pipe; 4, second branch pipe; 5, first branch; 6, third branch; 7, second branch; 8, split-and-combine microchannel; 9, hot water jacket; 10, first channel; 11, second channel. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described in detail below with reference to embodiments and in conjunction with the accompanying drawings.

[0017] Example: A carbon fiber spinning solution distribution tube based on microchannel, such as Figure 1 - Figure 2As shown, it includes a main pipe 1, characterized in that: the main pipe 1 is a hexagonal pipe, the main pipe 1 branches out a first branch pipe 2 and a third branch pipe 3 to the left and right sides respectively, and branches out a second branch pipe 4 downwardly, the first branch pipe 2 branches out a first branch 5 and a third branch 6 to the left and right sides respectively, and branches out a second branch 7 downwardly, and the pipe length of the second branch 7 is the same as the horizontal length of the first branch pipe 2 and the third branch pipe 3; the main pipe 1, the branch pipes and the branches are respectively annularly arranged with split-and-combine microchannels 8 on the inner pipe walls; the main pipe 1, the first branch pipe 2, the second branch pipe 4, the third branch pipe 3, the first branch 5, the second branch 7 and the third branch 6 are all sheathed with a hot water jacket 9; the split-and-combine microchannel 8 includes a first channel 10 consisting of two trapezoidal channels arranged in opposite directions and a second channel 10 consisting of two trapezoidal channels arranged in forward directions Channel 11, a converging channel is formed between the first channel 10 and the second channel 11, so the angle of the converging channel is J, the width of the first channel 10 is W1, the width of the second channel 11 is W2, the first channel 10 and the second channel 11 are aligned up and down and arranged in sequence along the pipe diameter, the length of the first channel 10 is H1, and the length of the second channel 11 is H2; the W1 is 3mm~4mm, W2 is 1mm~2mm, H1 is 6mm~7mm, and H2 is 13mm~15mm; the pipe length of the second branch pipe 4 is the same as that of the first branch pipe 2 and the third branch pipe 3; the branch structure of the second branch pipe 4 and the third branch pipe 3 is the same as that of the first branch pipe 2; the J inclination angle has four types: 30°, 45°, 60°, and 90°.

[0018] The principle of the present invention is as follows: after monomer polymerization, a polymer liquid is generated, and then after de-monomerization and degassing treatment, a raw silk liquid is obtained. Because the polymerization reaction is an exothermic reaction, the reaction rates in different parts of the reactor will be different, and it is inevitable that there will be certain differences in the conversion rate and molecular weight; the raw liquid is transported to the static mixer, and under its specific structural action, the carbon fiber raw liquid can reach a fully mixed state, and then it is transported to the raw liquid distribution main pipe 1. A hot water jacket 9 is provided on the outside of the raw liquid distribution pipe. The temperature of the raw liquid is increased by heat transfer, so that the material temperature is maintained at about 65°C. The main pipe 1 branches out a first branch pipe 2 and a third branch pipe 3 to the left and right sides respectively, and branches out a second branch pipe 4 downwards. The pipe length of the second branch pipe 4 is the same as that of the first branch pipe 2 and the third branch pipe 3; then the first branch pipe 2 branches out a first branch 5 and a third branch 6 to the left and right sides respectively, and branches out a second branch 7 downwards. The pipe length of the second branch 7 The sum is the same as the horizontal length of the first branch pipe 2 and the third branch pipe 3; the second branch pipe 4 and the third branch pipe 3 are the same as the first branch pipe 2, and finally a total of 9 stock liquid distribution branches are divided, each entering its corresponding coagulation bath tank; precisely because of this pipeline arrangement, in order to increase fluid disturbance and reduce the retention of high-viscosity stock liquid in the pipeline, so that the stock liquid can enter the 9 stock liquid distribution branches more evenly, a split-and-combine microchannel 8 with branches at a certain inclination angle is provided on the inner wall surface, and J is 30°, 45°, 60°, and 90° respectively, and other data are the same. The optimal solution is that W1 is 3mm, W2 is 1.5mm, H1 is 6mm, and H2 is 14mm; at the same time, a pressure sensor can be set on the inner wall of the pipeline to know the fluid flow distribution in each branch pipe; after distribution through the stock liquid distribution pipe, the stock liquid enters the coagulation bath tank more evenly and can proceed to the next step of processing.

[0019] Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and is susceptible to numerous variations. Any simple modifications, equivalent variations, and modifications to the above embodiments based on the technical essence of the present invention shall be deemed to fall within the scope of protection of the present invention.

Claims

1. A microchannel-based carbon fiber spinning solution distribution pipe, comprising a main pipe (1), characterized in that: The main pipe (1) is a hexagonal pipe. The main pipe (1) branches out a first branch pipe (2) and a third branch pipe (3) on the left and right sides respectively, and branches out a second branch pipe (4) downwards. The first branch pipe (2) branches out a first branch pipe (5) and a third branch pipe (6) on the left and right sides respectively, and branches out a second branch pipe (7) downwards. The pipe length of the second branch pipe (7) is the same as the transverse length of the first branch pipe (2) and the third branch pipe (3). Splitting and combining microchannels (8) are arranged in an annular shape on the inner pipe walls of the main pipe (1), the branch pipes and the branch pipes.

2. The microchannel-based carbon fiber spinning solution distribution tube according to claim 1, characterized in that: The exteriors of the main pipe (1), the first branch pipe (2), the second branch pipe (4), the third branch pipe (3), the first branch pipe (5), the second branch pipe (7) and the third branch pipe (6) are all sheathed with hot water jackets (9).

3. The microchannel-based carbon fiber spinning solution distribution tube according to claim 1, characterized in that: The split-and-combine microchannel (8) comprises a first channel (10) formed by two trapezoids arranged in opposite directions and a second channel (11) formed by two trapezoids arranged in forward directions. A converging channel is formed between the first channel (10) and the second channel (11), so the converging channel has an angle of J. The width of the first channel (10) is W1, and the width of the second channel (11) is W2. The first channel (10) and the second channel (11) are aligned vertically and arranged in sequence along the direction of the pipe diameter. The length of the first channel (10) is H1, and the length of the second channel (11) is H2.

4. The microchannel-based carbon fiber spinning solution distribution tube according to claim 3, characterized in that: The W1 is 3mm to 4mm, W2 is 1mm to 2mm, H1 is 6mm to 7mm, and H2 is 13mm to 15mm.

5. The microchannel-based carbon fiber spinning solution distribution tube according to claim 1, characterized in that: The pipe length of the second branch pipe (4) is the same as that of the first branch pipe (2) and the third branch pipe (3); the branching structure of the second branch pipe (4) and the third branch pipe (3) is the same as that of the first branch pipe (2).

6. The microchannel-based carbon fiber spinning solution distribution tube according to claim 3, characterized in that: The J tilt angles include four types: 30°, 45°, 60°, and 90°.

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