steam attenuator duct and steam attenuator

Abstract

The utility model relates to carbon fiber precursor spinning equipment technical field discloses a steam drafting filament bundle duct and steam drafting machine, steam drafting filament bundle duct includes drafting chamber, and the drafting chamber includes the tubular body of integrally formed of setting in the drafting chamber body and drafting chamber, with the steam temperature pressure in the drafting chamber is more uniform. Still provide a kind of steam drafting machine, including pressure-reducing chamber and aforementioned drafting chamber, and steam drafting machine duct interior is provided with the fine slit for the passage of filament bundle. The steam drafting filament bundle duct and steam drafting machine improve the draft ratio of original yarn.

Description

Technical Field

[0001] This utility model relates to the technical field of carbon fiber precursor spinning equipment, specifically to a steam drawing bundle channel and a steam drawing machine. Background Technology

[0002] Carbon fiber is primarily composed of carbon elements and is a high-strength, high-modulus fiber with a carbon content exceeding 90%. It possesses properties such as high temperature resistance, friction resistance, thermal conductivity, corrosion resistance, and a low coefficient of thermal expansion. It has a fibrous appearance and, due to its flexibility, can be processed into various fabrics. Its main application is as a reinforcing material, combined with resins, metals, ceramics, and carbon to create advanced composite materials. Carbon fiber reinforced epoxy resin composites have the highest specific strength and specific modulus among existing engineering materials.

[0003] The preparation of high-performance carbon fibers using polyacrylonitrile (PAI) fibers is currently the mainstream process in carbon fiber production. The production steps generally include polymerization, spinning, oxidation, and carbonization. After coagulation, stretching, washing, oiling, and drying, the PAI doss is then processed using a steam drawer to refine the fiber denier and increase its strength. In the process of preparing high-strength, fine-denier precursor fibers, a steam drawer is needed to stretch the fibers to between 2 and 3 times their original length. During steam stretching, the PAI molecular chains move more rapidly and rearrange and aggregate along the molecular axis, increasing the molecular chain orientation and crystallinity, thus increasing the strength of the precursor fibers and ultimately affecting the mechanical properties of the carbon fibers.

[0004] Patent document CN218812292U discloses a steam drawing device for carbon fiber precursor. The steam drawing device consists of a drawing machine body and a steam drawing chamber. Each end of the steam drawing chamber is provided with a steam decompression chamber. A steam expansion chamber is detachably installed at the port of each steam decompression chamber. A ceramic ring is provided on the streamlined end face outlet of the steam expansion chamber and / or on each decompression plate.

[0005] like Figure 2 As shown, the existing drawing bundle channel uses a segmented ceramic ring 4 structure as a buffer structure to buffer the steam pressure. However, in actual production, the setting of ceramic ring 4 causes a significant decrease in steam pressure and temperature after steam enters the ceramic ring 4 segment, affecting the draw ratio of the precursor fiber in the drawing tube section. The draw ratio can only reach 2 to 3 times, and the carbon fiber produced from this precursor fiber is not stable enough. Utility Model Content

[0006] The purpose of this invention is to overcome the technical problem that the use of a segmented ceramic ring structure inside the drawing bundle channel in the existing technology affects the drawing ratio of the raw filament. This invention provides a steam drawing bundle channel and a steam drawing machine, which improve the steam drawing ratio of the raw filament.

[0007] To achieve the above objectives, this utility model provides a steam-drawn fiber bundle channel, including a drawing cavity, which includes a drawing cavity body and an integrally formed tubular body disposed within the drawing cavity body, so as to make the steam temperature and pressure within the drawing cavity more uniform.

[0008] The fiber bundle is steam-drawn in a steam-drawing channel to obtain carbon fiber precursor. The fiber bundle is drawn within a one-piece tubular structure, and the steam flows within the tubular body, resulting in minimal temperature and pressure loss. This provides a stable temperature and pressure steam environment for the fiber bundle, which is more conducive to the drawing process and can increase the draw ratio of the fiber bundle.

[0009] Preferably, at the middle position of the drawing chamber, both the drawing chamber body and the corresponding tubular body are provided with holes to allow steam to be introduced.

[0010] This design makes the steam within the drawing chamber more uniform. Inside the drawing chamber, steam enters from the center and diffuses to both sides, resulting in a more uniform temperature and pressure of the steam delivered to the drawing chamber, which is more conducive to the steam drawing process.

[0011] Preferably, the aspect ratio of the tubular body is 27 to 54.

[0012] A suitable aspect ratio (i.e., the ratio of the tubular length to its inner diameter) improves the versatility of the tubular structure while ensuring the passage of the filament bundle. An aspect ratio of 27–54 is suitable for various drawn filament tunnel structures.

[0013] Preferably, the inner diameter of the tubular body is 10–20 mm.

[0014] A tubular body with an inner diameter of 10-20mm can reduce the frequency of wire blockage inside the channel, improve the passability of the filament bundle, improve the production line efficiency, and provide a steam drawing environment for filament bundles of various K numbers.

[0015] Preferably, it further includes a drawing section and a buffer section connected to the drawing section. The drawing cavity is located in the drawing section, and the buffer section is located at both ends of the drawing section. The buffer section is provided with a drain pipe to drain condensate.

[0016] The drawing section is mainly used for steam drawing of the yarn bundle. The buffer sections at both ends of the drawing section are used for preheating the yarn bundle before steam drawing and for depressurization after steam drawing, respectively. Drainage pipes are installed in the buffer sections to facilitate the discharge of condensate.

[0017] Preferably, it also includes a pressure relief chamber, which is disposed in the buffer section.

[0018] The steam-drawn fiber bundle channel is equipped with a pressure-reducing chamber and a drawing chamber, wherein the drawing chamber is located in the drawing section and the pressure-reducing chamber is located in the buffer section.

[0019] Preferably, a steam inlet pipe is provided at the bottom of the stretching chamber, and steam outlet pipes are provided at both the inlet and outlet sections of the decompression chamber.

[0020] The steam inlet pipe ensures a stable supply of steam to the stretching chamber from the steam supply device, while the steam outlet pipe allows some steam to be discharged when the pressure reduction chamber needs to lower the steam pressure, thereby achieving the purpose of pressure reduction.

[0021] Preferably, control valves are installed on the steam inlet pipe and the steam outlet pipe.

[0022] To more precisely control the amount of steam delivered to the drawing chamber, an intake control valve is installed on the steam inlet pipe. Simultaneously, to precisely control the steam pressure relief in the pressure reducing chamber, a pressure relief control valve can be installed on the steam outlet pipe.

[0023] Preferably, the steam-drawn fiber bundle channel has a symmetrical structure, with the drawing section located in the middle and the buffer sections symmetrically located at both ends of the drawing section.

[0024] To ensure a more uniform distribution of steam within the steam drawing bundle channel, the channel is designed with a symmetrical structure. The drawing section is located in the middle, serving as the steam input section, while buffer sections are symmetrically positioned on either side of the drawing section. This allows the steam to diffuse more evenly to the buffer sections on both sides of the drawing section, improving the uniformity of steam temperature and pressure loss.

[0025] The second aspect of this utility model provides a steam drawing machine, including the aforementioned steam drawing yarn channel, wherein the steam drawing yarn channel is provided with a slit for the yarn to pass through.

[0026] The steam drawing machine includes a steam drawing yarn tunnel. Inside the steam drawing machine tunnel, there is a narrow slit for the yarn to pass through. This narrow slit is large enough to accommodate yarns of all K-numbers, so that yarns of all K-numbers can complete the steam drawing process in the steam drawing machine, making the steam drawing machine more versatile.

[0027] Through the above technical solution, this utility model improves the segmented ceramic ring structure in the drawing section of the steam drawing bundle channel into an integrally formed tubular structure, reducing the temperature and pressure loss of the steam transported to the drawing chamber, making the steam diffusion in the drawing section more uniform, and making the steam distribution in the drawing section more uniform, which is more conducive to the steam drawing of the bundle in the drawing chamber, improving the drawing ratio of the bundle, and thus improving the performance of the carbon fiber precursor. Attached Figure Description

[0028] Figure 1 This is a partial structural diagram of a steam drawing machine; Figure 2 This is a schematic diagram of the existing drawing chamber structure; Figure 3This is a schematic diagram of the stretching cavity of this utility model.

[0029] Explanation of reference numerals in the attached figures 1. Drawing chamber; 2. Condensate flow direction; 3. Steam flow direction; 4. Ceramic ring; 5. Tubular body. Detailed Implementation

[0030] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0031] In this utility model, unless otherwise stated, directional terms such as "up, down, left, right, inside, outside, far, near, front" are generally used to refer to the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and therefore should not be construed as limiting this utility model.

[0032] like Figure 3 The diagram shows a steam-drawn fiber bundle channel, including a drawing chamber 1. The drawing chamber 1 includes a drawing chamber body and an integrally formed tubular body 5 disposed within the drawing chamber body, so as to make the steam temperature and pressure within the drawing chamber 1 more uniform.

[0033] Specifically, the drawing chamber 1 includes a drawing chamber body and a tubular body 5, wherein the tubular body 5 is a one-piece cylindrical tube installed inside the drawing chamber body. The one-piece tubular body 5 can be a long segment structure or a segmented structure.

[0034] The fiber bundle is steam-drawn in a steam-drawing channel to obtain carbon fiber precursor. The fiber bundle is drawn within an integrally formed tubular structure 5. Steam flows within the tubular structure 5, resulting in minimal temperature and pressure loss. This provides a stable temperature and pressure steam environment for the fiber bundle, which is more conducive to the drawing process and can increase the draw ratio of the fiber bundle.

[0035] Furthermore, at the middle position of the drawing chamber 1, both the drawing chamber body and the corresponding tubular body 5 are provided with holes to allow steam to be introduced.

[0036] To ensure more uniform steam distribution within the drawing chamber 1, the steam inlet is positioned at the center of the drawing chamber 1, such as... Figure 3 As shown. Specifically, holes for steam input are opened at corresponding positions on the drawing cavity body and the tubular body 5, allowing the input steam to pass through the holes sequentially through the drawing cavity body layer and the tubular body 5 layer into the interior of the tubular body 5. The steam flow direction 3 is as follows. Figure 3 As shown. Inside the drawing chamber 1, steam is input from the middle and diffuses to both sides, making the temperature and pressure of the steam inside the drawing chamber 1 relatively more uniform.

[0037] Furthermore, the aspect ratio of the tubular body 5 is 27–54.

[0038] The aspect ratio of the tubular body 5 improves its versatility. The aspect ratio of the tubular body is 27 to 54, which is suitable for various drawn wire tunnel structures.

[0039] Furthermore, the inner diameter of the tubular body 5 is 10–20 mm.

[0040] The inner diameter of the tubular body 5 is related to the passage of the filament bundle. In the parameter setting of the inner diameter of the tubular body 5, the inner diameter of the tubular body 5 is set to 10-20mm. In order to improve the passage of the filament bundle, the inner diameter of the tubular body 5 is preferably 12-18mm. This parameter can reduce the frequency of filament blockage inside the channel, improve the production efficiency of the production line, and also provide a steam drawing environment for filament bundles of various K numbers.

[0041] The tubular body 5 is preferably made of stainless steel. Stainless steel has good thermal conductivity and stable performance. During the process of conveying steam into the drawing chamber 1, the stainless steel tubular body 5 can be heated quickly as a whole, so that the space environment inside the tubular body 5 can be heated quickly and the temperature can become uniform quickly, which is more conducive to the steam drawing process of the filament bundle.

[0042] Furthermore, it also includes a drawing section and a buffer section connected to the drawing section. The drawing cavity 1 is located in the drawing section, and the buffer section is located at both ends of the drawing section. The buffer section is equipped with a drain pipe to drain condensate.

[0043] like Figure 1 As shown, the steam-drawing fiber bundle channel includes an interconnected drawing section and a buffer section, wherein the drawing cavity 1 is located within the drawing section, and the buffer sections are located at both ends of the drawing section. The drawing section is mainly used for the steam drawing of the fiber bundle, while the buffer sections at both ends are used for preheating the fiber bundle before steam drawing and for depressurization after steam drawing, respectively.

[0044] Steam enters the tunnel from the stretching section and flows towards the buffer sections on both sides. During steam diffusion in the buffer sections, there is a loss of temperature and pressure. The steam that loses temperature will condense into water, resulting in condensate formation in the buffer sections. Drainage pipes are installed in the buffer sections to facilitate condensate drainage. The condensate flow direction is as shown in Figure 2. Figure 1 As shown.

[0045] Furthermore, it also includes a pressure relief chamber, which is located in the buffer section.

[0046] The steam-drawn fiber bundle channel is provided with a pressure-reducing chamber and a drawing chamber 1, wherein the drawing chamber 1 is located in the drawing section and the pressure-reducing chamber is located in the buffer section.

[0047] Furthermore, a steam inlet pipe is provided at the bottom of the stretching chamber 1, and steam outlet pipes are provided at both the inlet and outlet sections of the pressure reducing chamber.

[0048] Specifically, the drawing chamber 1 has a hole at its bottom. One end of the steam inlet pipe extends through the hole into the tubular body 5 of the drawing chamber 1 and is sealed to the drawing chamber 1. The other end of the steam inlet pipe is sealed to the steam supply device, so that the steam supply device can stably input steam into the drawing chamber 1. The pressure reducing chamber is equipped with steam outlet pipes at both its inlet and outlet sections, so that when the pressure reducing chamber needs to reduce steam pressure, the steam outlet pipes can be opened to discharge some steam, thereby achieving the purpose of pressure reduction.

[0049] Furthermore, control valves are installed on the steam inlet pipe and the steam outlet pipe.

[0050] To more precisely control the amount of steam delivered to the drawing chamber 1, an intake control valve is installed on the steam inlet pipe. Simultaneously, to precisely control the pressure relief of the steam in the pressure reducing chamber, a pressure relief control valve can be installed on the steam outlet pipe.

[0051] Furthermore, the steam-drawn fiber bundle channel has a symmetrical structure, with the drawing section located in the middle and the buffer sections symmetrically located at both ends of the drawing section.

[0052] To ensure a more uniform distribution of steam within the steam drawing bundle channel, the channel is designed with a symmetrical structure. The drawing section is located in the middle, serving as the steam input section, while buffer sections are symmetrically positioned on either side of the drawing section. This allows the steam to diffuse more evenly to the buffer sections on both sides of the drawing section, improving the uniformity of steam temperature and pressure loss.

[0053] A steam drawing machine includes the aforementioned steam drawing yarn tunnel, the interior of which is provided with slits for the yarn to pass through.

[0054] The steam drawing machine includes a steam drawing yarn tunnel. Inside the steam drawing machine tunnel, there is a narrow slit for the yarn to pass through. This narrow slit is large enough to accommodate yarns of all K-numbers, so that yarns of all K-numbers can complete the steam drawing process in the steam drawing machine, making the steam drawing machine more versatile.

[0055] This invention improves the segmented ceramic ring 4 structure in the drawing section of the steam drawing yarn channel into an integrally formed tubular structure 5, which makes the steam in the drawing section more uniform and more conducive to the steam drawing of the yarn in the drawing cavity 1.

[0056] Example 1: When the internal temperature of the steam drawing machine chamber is 140℃, after replacing the segmented ceramic rings inside the steam drawing yarn channel with stainless steel tubular bodies 5, and ensuring the yarn tension is 60N, the drawing ratio of the steam drawing machine increases from 2.9 times to 3.3 times, and the breaking strength of the yarn increases from 6.65CN / dtex to 7.6 CN / dtex. The increase in the yarn drawing ratio also improves the strength of the carbon fiber yarn obtained after the steam drawing process.

[0057] Example 2: The drawing limits of the steam drawing machine were tested before and after modification at an internal temperature of 140℃. The tests revealed that the drawing ratio increased from 3 times to 3.7 times after modification. When the drawing ratio was less than or equal to 3.6 times, fewer fuzzy fibers were obtained, the probability of fiber blockage in the steam drawing bundle channel decreased, and the filament strength reached 7.81 CN / dtex. The high-performance carbon fibers produced by steam drawing the bundle using the steam drawing bundle channel of this invention exhibit fewer fuzzy fibers and more stable performance.

[0058] It should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0059] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A steam-drawn fiber bundle channel, characterized in that, It includes a drawing chamber (1), which includes a drawing chamber body and an integrally formed tubular body (5) disposed within the drawing chamber body, so as to make the steam temperature and pressure in the drawing chamber (1) more uniform.

2. The steam-drawn fiber bundle channel according to claim 1, characterized in that, At the middle position of the stretching cavity (1), both the stretching cavity body and the corresponding tubular body (5) are provided with holes to allow steam to be introduced.

3. The steam-drawn fiber bundle channel according to claim 2, characterized in that, The aspect ratio of the tubular body (5) is 27 to 54.

4. The steam-drawn fiber bundle channel according to claim 3, characterized in that, The inner diameter of the tubular body (5) is 10-20 mm.

5. The steam-drawn fiber bundle channel according to claim 2, characterized in that, It also includes a drawing section and a buffer section connected to the drawing section. The drawing cavity (1) is located in the drawing section, and the buffer section is located at both ends of the drawing section. The buffer section is provided with a drain pipe to drain condensate.

6. The steam-drawn fiber bundle channel according to claim 5, characterized in that, It also includes a pressure relief chamber, which is located in the buffer section.

7. The steam-drawn fiber bundle channel according to claim 6, characterized in that, The bottom of the stretching chamber (1) is provided with a steam inlet pipe, and the inlet and outlet sections of the pressure reducing chamber are both provided with steam outlet pipes.

8. The steam-drawn fiber bundle channel according to claim 7, characterized in that, Control valves are installed on the steam inlet pipe and the steam outlet pipe.

9. The steam-drawn fiber bundle channel according to claim 6, characterized in that, The steam-drawn fiber bundle channel has a symmetrical structure, with the drawing section located in the middle and the buffer sections symmetrically located at both ends of the drawing section.

10. A steam drawing machine, characterized in that, The steam-drawing yarn channel according to any one of claims 1-9 is provided with a slit inside the steam-drawing yarn channel for the yarn to pass through.

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