Supercritical co2 anhydrous dyeing apparatus

Abstract

The application discloses a supercritical CO2 anhydrous dyeing equipment, which comprises a dyeing kettle body and a kettle cover, and the kettle cover seals a kettle opening of the dyeing kettle body; a top inlet and outlet is arranged at the top of the dyeing kettle body, and a bottom inlet and outlet is arranged at the bottom of the dyeing kettle body; an upper baffle and a lower baffle are arranged on the inner side of the dyeing kettle body, the upper baffle and the lower baffle separate the dyeing kettle body to form a dyeing cavity, the upper baffle separates the top of the dyeing kettle body into an upper chamber, the lower baffle separates the bottom of the dyeing kettle body into a lower chamber, the dyeing kettle body is provided with an upper dye box and a lower dye box, the upper dye box is located in the upper chamber, the lower dye box is located in the lower chamber, and the upper dye box and the lower dye box both have a filtering function; a porous pipe is connected between the upper baffle and the lower baffle, the upper end of the porous pipe is inserted into a jack, and the porous pipe extends along a serpentine path; the direction of the hollow of the porous pipe comprises a radial direction of the dyeing kettle body and an oblique direction to the radial direction of the dyeing kettle body. The application can improve the dyeing efficiency of the dyeing equipment integrating the dyeing kettle and the dyeing kettle.

Description

Technical Field

[0001] This application relates to the field of dyeing and finishing technology, and in particular to a supercritical CO2 anhydrous dyeing device. Background Technology

[0002] The dyeing and finishing industry is an indispensable sector in people's lives and the national economy, but it has historically been a major consumer of water and a major polluter. The pollution caused by this industry endangers human health and lives and damages the ecological environment. The use of supercritical carbon dioxide dyeing is a major breakthrough in the dyeing and finishing industry. Supercritical carbon dioxide dyeing is fast, dyes and carbon dioxide can be reused, and the reduction cleaning and baking processes can be eliminated. It is a clean production process with no waste gas, wastewater, or waste residue emissions.

[0003] The main components of the supercritical carbon dioxide dyeing process include a dyeing kettle, a dyeing kettle, a CO2 supply and storage system, and a circulation separation system. The dyeing kettle is the core unit for performing the dyeing process. Patent CN100473774C discloses a dyeing kettle in a supercritical carbon dioxide dyeing device. The dyeing kettle has an upper chamber formed by a fabric upper baffle at its top, with a through hole in the central area of ​​the fabric upper baffle. An upper dye box is located within the upper chamber. A lower chamber is formed by a fabric lower baffle at its bottom, with a carbon dioxide flow channel between the fabric lower baffle and the inner wall of the dyeing kettle. A lower dye box is located within the lower chamber. A porous tube coaxial with the dyeing kettle is located within the dyeing kettle. The upper end of the porous tube is fixed to the through hole in the central area of ​​the fabric upper baffle, and the lower end is fixed to the fabric lower baffle. The outer wall of the porous tube is completely covered by a stainless steel filter screen.

[0004] This invention integrates a dyeing kettle and a fabric dyeing kettle into one unit, allowing dye dissolution and fabric adsorption to be completed simultaneously within a single dyeing kettle. This simplifies the delivery pipeline and reduces fluid flow resistance. However, during operation, the pores on the porous tube of this dyeing kettle face a single direction, all radially, which easily leads to laminar flow. To ensure dyeing uniformity, a longer dyeing time is required, and dyeing efficiency needs further improvement. Summary of the Invention

[0005] In order to improve the dyeing efficiency of dyeing equipment that integrates dyeing and dyeing kettles, this application provides a supercritical CO2 anhydrous dyeing equipment.

[0006] The supercritical CO2 anhydrous dyeing device provided in this application adopts the following technical solution: A supercritical CO2 anhydrous dyeing apparatus includes a dyeing vessel body and a vessel lid, the vessel lid sealing the opening of the dyeing vessel body; the dyeing vessel body has a top inlet / outlet and a bottom inlet / outlet; the inner side of the dyeing vessel body is provided with an upper baffle and a lower baffle, the upper baffle and the lower baffle separating the dyeing vessel body to form a dyeing chamber, the upper baffle separating the top of the dyeing vessel body into an upper chamber, the lower baffle separating the bottom of the dyeing vessel body into a lower chamber, the upper chamber communicating with the top inlet / outlet, and the lower chamber communicating with the bottom inlet / outlet; the dyeing vessel body is provided with... The apparatus includes an upper dye box and a lower dye box, the upper dye box being located in the upper chamber and the lower dye box being located in the lower chamber. Both the upper and lower dye boxes have filtration functions. A porous tube connects the upper and lower baffles. The upper baffle has an insertion hole, and the upper end of the porous tube is inserted into the insertion hole. The porous tube has holes distributed on its wall and extends along a serpentine path. The holes on the porous tube have different orientations, including those along the radial direction of the dyeing vessel and those inclined to the radial direction of the dyeing vessel. The lower baffle has holes for fluid to pass through.

[0007] By adopting the above technical solution, the porous tube extends along a serpentine path, allowing for the setting of holes in various directions along the radial direction of the dyeing kettle and along the direction inclined to the radial direction of the dyeing kettle. The supercritical carbon dioxide entering and exiting the holes of the porous tube will form flow trajectories in various directions, and the supercritical carbon dioxide will produce phenomena such as convergence and interference, enabling the supercritical carbon dioxide to more fully impregnate the fabric, which is beneficial to improving the dyeing efficiency while ensuring the uniformity of fabric dyeing.

[0008] Optionally, both the upper dye box and the lower dye box are provided with a sandwich cavity. The inner cavity of the sandwich cavity is a flat chamber. The sandwich cavity has a flat structure and has two parallel main sidewalls. The main sidewalls are perpendicular to the center line of the dyeing vessel. The main sidewalls have a filtering function. Helical springs are provided on both sides of the sandwich cavity. Both helical springs are in a pre-compression deformation state.

[0009] By adopting the above technical solution, when filling the upper and lower dye boxes with dye, a portion of the dye is first filled into the dye box, then placed into the interlayer cavity, and finally the remaining dye is filled, ensuring a dense filling. The helical springs on both sides of the interlayer cavity keep it suspended, thus maintaining it in the center of the dye. With the dye densely filled in the upper and lower dye boxes, the supercritical carbon dioxide needs to overcome the resistance of the dye as it flows through the filler. By setting up an interlayer cavity within the upper and lower dye boxes, which occupies a certain space inside the dye, the resistance of the supercritical carbon dioxide flowing through the dye is reduced, thereby promoting dye dissolution.

[0010] Optionally, each of the two main sidewalls is provided with a positioning post on its outer surface. The positioning post is located inside the helical spring on the same side. The length of the positioning post is less than that of the helical spring on the same side. The helical spring and the positioning post are in clearance fit. A polytetrafluoroethylene lubricating pad is provided between the helical spring and the interlayer cavity.

[0011] By adopting the above technical solution, the positioning post on the main sidewall plays a positioning role for the helical spring, keeping the relative position between the main sidewall and the helical spring stable. The PTFE lubricating pad can lubricate the relative rotation between the sandwich cavity and the helical spring, reducing the resistance to the rotation of the sandwich cavity.

[0012] Optionally, the inner side of the sandwich cavity is provided with a plurality of swirling guide vanes, which are distributed in a circumferential array along the center line of the sandwich cavity.

[0013] By adopting the above technical solution, the swirling guide vane can generate swirling flow of supercritical carbon dioxide flowing through the interlayer cavity, which is beneficial to improving the dye dissolution efficiency and thus improving the dyeing efficiency of the fabric.

[0014] Optionally, a sandwich ring is connected between the two main sidewalls, and the swirl guide vane is fixedly connected to the sandwich ring.

[0015] By adopting the above technical solution, the sandwich ring is connected to the two main side walls to form a sandwich cavity, thereby forming a flat chamber. The swirl guide vane is fixedly connected to the sandwich ring, making installation relatively convenient.

[0016] Optionally, the outer peripheral surface of the sandwich ring is provided with a disturbance flow structure, and the disturbance flow structure is distributed in an array along the central circumference of the sandwich ring.

[0017] By adopting the above technical solution, when the dye in the dye box is fully dissolved, the interlayer cavity is in a suspended state. At this time, the supercritical carbon dioxide flowing through the swirling guide vanes will drive the interlayer cavity to rotate, thereby disturbing the supercritical carbon dioxide in the turbulence structure, thus promoting the uniformity of dyeing.

[0018] Optionally, the porous tube includes an upper straight tube, a lower straight tube, a first meandering tube, and a second meandering tube. The upper straight tube is inserted into the insertion hole, and the lower straight tube is fixedly connected to the lower baffle. The plane of the extension path of the first meandering tube is perpendicular to the plane of the extension path of the second meandering tube. The two ends of the first meandering tube are respectively connected to the upper straight tube and the lower straight tube, and the second meandering tube is respectively connected to the upper straight tube and the lower straight tube.

[0019] By adopting the above technical solution, the porous tube has two branches, a first meandering tube and a second meandering tube, which can reduce the resistance of the supercritical fluid. The extension trajectories of the first meandering tube and the second meandering tube are perpendicular to each other, so that the first meandering tube and the second meandering tube form a three-dimensional spatial structure. This is beneficial to ensure that the supercritical carbon dioxide entering and exiting the porous tube can be distributed as evenly as possible in the staining chamber, thereby further improving the uniformity of staining.

[0020] Optionally, the upper straight tube and the lower straight tube are respectively provided with binding rings, and a gap is left between the binding rings and the porous tube for the fabric to pass through; the first meandering tube and the second meandering tube together prevent the binding rings from leaving the upper straight tube or the lower straight tube.

[0021] By adopting the above technical solution, after the fabric is filled into the dyeing chamber, the fabric is spread out in the dyeing chamber and then draped over the binding ring after passing through the annular gap between the porous tube and the binding ring. This creates frictional resistance between the fabric and the binding ring, making it difficult for the fabric to fall off the binding ring. This helps to keep the fabric in a stable position in the dyeing chamber, reduces fabric condensation and accumulation, and allows for more sufficient contact between supercritical carbon dioxide and the fabric.

[0022] Optionally, the restraint ring is a ring-shaped helical spring.

[0023] By adopting the above technical solution, the annular helical spring has an annular hollow area and a helical gap. Using the annular helical spring as a binding ring allows supercritical carbon dioxide to easily pass through the binding ring, making the binding ring less likely to affect the dyeing process. Moreover, the annular helical spring can flexibly expand and contract, making it easy to assemble and disassemble.

[0024] In summary, this application includes at least one of the following beneficial technical effects: The porous tube extends along a serpentine path, allowing for the installation of various orifices along the radial direction of the dyeing vessel and along an inclined direction. The supercritical carbon dioxide entering and exiting the orifices of the porous tube will form flow trajectories in various directions, and the supercritical carbon dioxide will produce phenomena such as convergence and interference, enabling the supercritical carbon dioxide to more fully impregnate the fabric. This is beneficial for improving dyeing efficiency while ensuring the uniformity of fabric dyeing.

[0025] The dye is densely packed in the upper and lower dye boxes. When supercritical carbon dioxide flows through the packing material, it needs to overcome the resistance of the dye. By setting up a sandwich cavity in the upper and lower dye boxes, the sandwich cavity occupies a certain space inside the dye, which helps to reduce the resistance of supercritical carbon dioxide flowing through the dye, thereby promoting the dissolution of the dye. Attached Figure Description

[0026] Figure 1This is a schematic diagram of the overall structure of Example 1.

[0027] Figure 2 This is a schematic diagram of the porous tube in Example 1.

[0028] Figure 3 This is a schematic diagram of the sandwich cavity structure in Example 1.

[0029] Figure 4 This is a schematic diagram of the overall structure of Example 2.

[0030] Figure 5 This is a schematic diagram of the porous tube structure in Example 2.

[0031] Explanation of reference numerals in the attached figures: 1. Dyeing vessel body; 11. Vessel lid; 12. Quick-release clamp structure; 13. Top inlet / outlet; 14. Bottom inlet / outlet; 15. Upper chamber; 16. Lower chamber; 2. Porous tube; 21. Upper straight tube; 22. Lower straight tube; 23. First meandering tube; 24. Second meandering tube; 3. Heating jacket; 5. Upper baffle; 51. Insertion hole; 6. Lower baffle; 7. Upper dye box; 71. Box lid; 8. Lower dye box; 9. Jacketed cavity; 91. Main side wall; 92. Jacketed ring; 93. Positioning post; 94. Swirl guide vane; 95. Turbulence structure; 10. Helical spring; 20. PTFE lubricating pad; 30. Restraint ring. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail. Example 1

[0033] This application discloses a supercritical CO2 anhydrous dyeing apparatus. (Refer to...) Figure 1 and Figure 2 The supercritical CO2 anhydrous dyeing equipment includes a dyeing vessel body 1, a vessel cover 11, and a heating jacket 3. The heating jacket 3 is sealed to the dyeing vessel body 1 to form a heating medium gap. The vessel opening of the dyeing vessel body 1 is provided with a flange structure. The vessel cover 11 is connected to the flange structure at the vessel opening through a quick-release clamp structure 12. The vessel cover 11 closes the vessel opening of the dyeing vessel body 1. The top of the dyeing vessel body 1 is provided with a top inlet / outlet 13, which is arranged radially along the dyeing vessel body 1. The bottom is provided with a bottom inlet / outlet 14, which is arranged axially along the dyeing vessel body 1.

[0034] The dyeing vessel body 1 is provided with an upper baffle 5 and a lower baffle 6 on its inner side. The upper baffle 5 and the lower baffle 6 divide the dyeing vessel body 1 to form a dyeing chamber. The upper baffle 5 divides the top of the dyeing vessel body 1 into an upper chamber 15, and the lower baffle 6 divides the bottom of the dyeing vessel body 1 into a lower chamber 16. The upper chamber 15 is connected to the top inlet / outlet 13, and the lower chamber 16 is connected to the bottom inlet / outlet 14. The dyeing vessel body 1 is provided with an upper dye box 7 and a lower dye box 8. The upper dye box 7 is located in the upper chamber 15 and is detachably installed on the upper baffle 5 by screws. The upper dye box 7 has a box cover 71. The box cover 71 and the bottom wall of the upper dye box 7 are both made of stainless steel sintered filter plate. The lower dye box 8 is located in the lower chamber 16 and the box opening of the lower dye box 8 is detachably installed on the lower baffle 6 by screws. The bottom wall and side wall of the lower dye box 8 are both made of stainless steel sintered filter plate.

[0035] The upper baffle 5 is equipped with an annular baffle structure, and the upper dye box 7 is located inside the annular baffle. The annular baffle has holes distributed circumferentially for fluid to pass through. The annular baffle can make the supercritical carbon dioxide flow more evenly when passing through the upper dye box 7.

[0036] A porous tube 2 is connected between the upper baffle 5 and the lower baffle 6. The upper baffle 5 is provided with an insertion hole 51, which is directly opposite the bottom wall of the upper dye box 7. The upper end of the porous tube 2 is inserted into the insertion hole 51. The tube wall of the porous tube 2 is distributed with holes. The porous tube 2 extends along a serpentine path. Straight tube sections are provided at both ends of the porous tube 2. The porous tube 2 is connected to the upper baffle 5 and the lower baffle 6 through the straight tube sections. The holes on the porous tube 2 are oriented in different directions, including radially along the dyeing vessel body 1 and inclined radially to the dyeing vessel body 1. The lower baffle 6 is provided with holes for fluid to pass through.

[0037] The implementation principle of the supercritical CO2 anhydrous dyeing equipment in this application embodiment is as follows: When using the supercritical CO2 anhydrous dyeing equipment, the fabric is filled into the dyeing chamber and tied to the porous tube; supercritical carbon dioxide flows through the dyeing equipment from top to bottom or from bottom to top; since the porous tube 2 of the dyeing equipment extends along a serpentine path, holes of various different orientations can be set on the porous tube 2 along the radial direction of the dyeing vessel 1 and along the radial direction inclined to the dyeing vessel 1. The supercritical carbon dioxide entering and exiting the holes of the porous tube 2 will form flow trajectories of various different directions, and the supercritical carbon dioxide will produce phenomena such as convergence and interference, so that the supercritical carbon dioxide can more fully impregnate the fabric, which is beneficial to improving the uniformity of fabric dyeing.

[0038] Reference Figure 1 and Figure 3Both the upper dye box 7 and the lower dye box 8 are equipped with a sandwich cavity 9. The inner cavity of the sandwich cavity 9 is a flat chamber. The sandwich cavity 9 has two parallel main side walls 91, and a sandwich ring 92 is welded between the two main side walls 91. The sandwich ring 92 and the two main side walls 91 together form a flat inner cavity. The main side walls 91 are perpendicular to the center line of the dyeing vessel body 1. The material of the main side walls 91 is a sintered stainless steel filter plate, which enables the main side walls 91 to filter out large particles of dye that are not fully dissolved. Helical springs 10 are provided on both sides of the sandwich cavity 9. Both helical springs 10 are in a pre-compression deformed state. Positioning posts 93 are welded and fixed to the outer surfaces of the two main side walls 91. The positioning posts 93 are located inside the helical springs 10 on the same side. The length of the positioning posts 93 is less than that of the helical springs 10 on the same side. The helical springs 10 and the positioning posts 93 are clearance-fitted. A polytetrafluoroethylene lubricating pad 20 is provided between the helical springs 10 and the sandwich cavity 9.

[0039] The dye is densely packed in the upper dye box 7 and the lower dye box 8. When supercritical carbon dioxide flows through the packing, it needs to overcome the resistance of the dye. By setting a sandwich cavity 9 in the upper dye box 7 and the lower dye box 8, the sandwich cavity 9 occupies a certain space inside the dye, which helps to reduce the resistance of supercritical carbon dioxide flowing through the dye, thereby promoting the dissolution of the dye.

[0040] Multiple swirling guide vanes 94 are provided on the inner side of the sandwich cavity 9. The swirling guide vanes 94 are welded and fixed to the sandwich ring 92. The multiple swirling guide vanes 94 are arranged in a circumferential array along the center line of the sandwich cavity 9. The outer circumferential surface of the sandwich ring 92 is provided with a disturbance flow structure 95. The disturbance flow structure 95 is arranged in a circumferential array along the center of the sandwich ring 92.

[0041] The swirling guide vane 94 enables the supercritical carbon dioxide flowing through the interlayer cavity 9 to generate a swirling flow, which is beneficial to improving the dye dissolution efficiency and thus improving the dyeing efficiency of the fabric. When the dye in the dye box is fully dissolved, the interlayer cavity 9 is in a suspended state. At this time, the supercritical carbon dioxide flowing through the swirling guide vane 94 will drive the interlayer cavity 9 to rotate, thereby disturbing the supercritical carbon dioxide by the turbulence structure 95, which in turn promotes the uniformity of dyeing. Example 2

[0042] Reference Figure 4 and Figure 5The difference between this embodiment and embodiment 1 is that, in this embodiment, the porous tube 2 includes an upper straight tube 21, a lower straight tube 22, a first meandering tube 23, and a second meandering tube 24. The upper straight tube 21 is inserted into the insertion hole 51, and the lower straight tube 22 is fixedly connected to the lower baffle 6. The plane where the extension path of the first meandering tube 23 is located is perpendicular to the plane where the extension path of the second meandering tube 24 is located. The two ends of the first meandering tube 23 are respectively connected to the upper straight tube 21 and the lower straight tube 22, while the second meandering tube 24 is respectively connected to the upper straight tube 21 and the lower straight tube 22.

[0043] The implementation principle of this embodiment is as follows: The porous tube 2 has two branches, a first meandering tube 23 and a second meandering tube 24, which can reduce the resistance of the supercritical fluid. The extension trajectories of the first meandering tube 23 and the second meandering tube 24 are perpendicular to each other, so that the first meandering tube 23 and the second meandering tube 24 form a three-dimensional spatial structure. This is beneficial to ensure that the supercritical carbon dioxide entering and exiting the porous tube 2 is distributed as evenly as possible in the staining chamber, thereby further improving the uniformity of staining.

[0044] Another difference between this embodiment and Embodiment 1 is that each end of the porous tube 2 is provided with a binding ring 30, which is a ring-shaped helical spring 10. A gap is left between the binding ring 30 and the porous tube 2 for the fabric to pass through. The first meandering tube 23 and the second meandering tube 24 together prevent the binding ring 30 from leaving the upper straight tube 21 or the lower straight tube 22. After the fabric is filled into the dyeing chamber, it is spread out inside the dyeing chamber and then draped over the binding ring 30 after passing through the annular gap between the porous tube 2 and the binding ring 30. This creates frictional resistance between the fabric and the binding ring 30, making it difficult for the fabric to come off the binding ring 30. This helps to keep the fabric in a stable position in the dyeing chamber, reduces fabric condensation and accumulation, and allows for more sufficient contact between supercritical carbon dioxide and the fabric.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A supercritical CO2 anhydrous dyeing device, characterized in that: The apparatus includes a dyeing vessel body (1) and a lid (11), the lid (11) sealing the opening of the dyeing vessel body (1); the dyeing vessel body (1) has a top inlet / outlet (13) and a bottom inlet / outlet (14); the dyeing vessel body (1) has an upper baffle (5) and a lower baffle (6) on its inner side, the upper baffle (5) and the lower baffle (6) separating the dyeing vessel body (1) to form a dyeing chamber, the upper baffle (5) separating the top of the dyeing vessel body (1) into an upper chamber (15), the lower baffle (6) separating the bottom of the dyeing vessel body into a lower chamber (16), the upper chamber (15) communicating with the top inlet / outlet (13), and the lower chamber (16) communicating with the bottom inlet / outlet (14). The body (1) is provided with an upper dye box (7) and a lower dye box (8). The upper dye box (7) is located in the upper chamber (15), and the lower dye box (8) is located in the lower chamber (16). Both the upper dye box (7) and the lower dye box (8) have a filtering function. A porous tube (2) is connected between the upper baffle (5) and the lower baffle (6). The upper baffle (5) is provided with an insertion hole (51). The upper end of the porous tube (2) is inserted into the insertion hole (51). The tube wall of the porous tube (2) is distributed with holes. The porous tube (2) extends along a serpentine path. The orientation of the holes of the porous tube (2) includes radial direction along the dyeing vessel body (1) and inclined radial direction to the dyeing vessel body (1). The lower baffle (6) is provided with holes for fluid to pass through.

2. The supercritical CO2 anhydrous dyeing equipment according to claim 1, characterized in that: Both the upper dye box (7) and the lower dye box (8) are provided with a double-layered cavity (9). The inner cavity of the double-layered cavity (9) is a flat chamber. The double-layered cavity (9) has a flat structure and two parallel main sidewalls (91). The main sidewalls (91) are perpendicular to the center line of the dyeing vessel body (1). The main sidewalls (91) have a filtering function. The double-layered cavity (9) is provided with helical springs (10) on both sides. Both helical springs (10) are in a pre-compression deformation state.

3. The supercritical CO2 anhydrous dyeing equipment according to claim 2, characterized in that: The outer surfaces of the two main sidewalls (91) are provided with positioning posts (93), the positioning posts (93) are located inside the helical springs (10) on the same side, the length of the positioning posts (93) is less than that of the helical springs (10) on the same side, and the helical springs (10) and the positioning posts (93) are in clearance fit; a polytetrafluoroethylene lubricating pad (20) is provided between the helical springs (10) and the interlayer cavity (9).

4. The supercritical CO2 anhydrous dyeing equipment according to claim 3, characterized in that: The inner side of the sandwich cavity (9) is provided with a plurality of swirling guide vanes (94), and the plurality of swirling guide vanes (94) are arranged in a circumferential array along the center line of the sandwich cavity (9).

5. The supercritical CO2 anhydrous dyeing equipment according to claim 4, characterized in that: A sandwich ring (92) is connected between the two main sidewalls (91), and the swirl guide vane (94) is fixedly connected to the sandwich ring (92).

6. The supercritical CO2 anhydrous dyeing apparatus according to claim 5, characterized in that: The outer circumferential surface of the sandwich ring (92) is provided with a disturbance flow structure (95), and the disturbance flow structure (95) is distributed in an array along the central circumference of the sandwich ring (92).

7. The supercritical CO2 anhydrous dyeing equipment according to claim 1, characterized in that: The porous tube (2) includes an upper straight tube (21), a lower straight tube (22), a first meandering tube (23), and a second meandering tube (24). The upper straight tube (21) is inserted into the insertion hole (51), and the lower straight tube (22) is fixedly connected to the lower baffle (6). The plane of the extension path of the first meandering tube (23) is perpendicular to the plane of the extension path of the second meandering tube (24). The two ends of the first meandering tube (23) are respectively connected to the upper straight tube (21) and the lower straight tube (22), and the second meandering tube (24) is respectively connected to the upper straight tube (21) and the lower straight tube (22).

8. The supercritical CO2 anhydrous dyeing apparatus according to claim 7, characterized in that: The upper straight tube (21) and the lower straight tube (22) are respectively provided with binding rings (30), and a gap is left between the binding rings (30) and the porous tube (2) for the fabric to pass through; the first meandering tube (23) and the second meandering tube (24) together prevent the binding rings (30) from leaving the upper straight tube (21) or the lower straight tube (22).

9. The supercritical CO2 anhydrous dyeing equipment according to claim 8, characterized in that: The restraint ring (30) is a ring-shaped helical spring (10).

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