Preparation process of carbon fiber shielding sleeve

Abstract

The invention discloses a preparation process of a carbon fiber shielding sleeve, and belongs to the field of shielding pumps. The method comprises the steps that S1, a cylinder is formed through injection molding to serve as a base body; s2, a core mold is arranged to support the barrel and drive the barrel to rotate, and the carbon fiber belt is wound around a carbon fiber winding area on the outer wall of the barrel; s3, performing full-coverage reciprocating rolling on the wound carbon fiber layer, and breaking and discharging tiny bubbles; and S4, continuously winding a shaping film on the outer side of the cylinder wound with the carbon fiber layer to prevent the glue solution from overflowing, then taking out the core mold, and sending the core mold into a curing oven for curing treatment. The prepared carbon fiber shielding sleeve can replace a metal shielding sleeve, the motor efficiency can be improved, and the reliability of the shielding sleeve can be guaranteed.

Description

Technical Field

[0001] This invention relates to the field of shielding sleeve technology, and more specifically, to a process for manufacturing carbon fiber shielding sleeves. Background Technology

[0002] Canned motor pumps, as a type of fluid transport device that highly integrates the electric motor and pump body to achieve fully sealed operation, have irreplaceable advantages in fields with extremely high requirements for safety and reliability, such as modern chemical engineering, pharmaceuticals, nuclear power, and aerospace. Their core design eliminates traditional mechanical seals or packing seals, completely encasing the motor stator and rotor with non-magnetic metal shielding sleeves, thus completely isolating the motor windings from the transported medium and achieving zero-leakage operation.

[0003] Currently, the shielding sleeves in industrial canned motor pumps are almost entirely made of metal, primarily due to the proven reliability of metal materials in long-term engineering practice. However, as canned motor pumps develop towards higher efficiency, more extreme operating conditions, and longer lifespans, the inherent defects of traditional metal shielding sleeves are becoming increasingly apparent: In a high-frequency rotating magnetic field, significant eddy currents are induced inside the metal shielding sleeve, generating Joule heating, i.e., eddy current losses. This loss not only directly reduces motor efficiency but also causes the shielding sleeve itself to heat up, accelerating material performance degradation. In practice, to reduce eddy current losses, the shielding sleeve often needs to be made very thin, which makes it extremely prone to microcracks, residual stress concentration, or deformation during molding and welding, and poses a potential risk of fatigue failure.

[0004] To overcome the aforementioned bottlenecks of metal shielding sleeves, the industry has begun exploring non-metallic alternatives. Using plastic shielding sleeves theoretically promises significant improvements in pump efficiency, weight reduction, and adaptability to a wider range of corrosive media. However, applying plastic materials to the demanding application of canned motor pumps presents stringent technical challenges. The shielding sleeve must withstand internal pressure, high-speed centrifugal force, and thermal cycling stress over extended periods; ensuring the reliability and stability of the plastic shielding sleeve under these conditions is a critical issue. Summary of the Invention

[0005] 1. The technical problem that the invention aims to solve

[0006] In view of the high eddy current loss of existing metal shielding sleeves, which affects motor efficiency, this invention aims to provide a carbon fiber shielding sleeve manufacturing process. The carbon fiber shielding sleeve prepared can help improve motor efficiency and ensure the reliability of the shielding sleeve.

[0007] 2. Technical Solution To achieve the above objectives, the technical solution provided by the present invention is as follows: The present invention provides a process for manufacturing a carbon fiber shielding sleeve, comprising: S1. Injection-molded cylindrical body as the base; in practice, the cylindrical body can be made of PPS+30%GF glass fiber and integrally molded by injection molding process. S2. Set the core mold support cylinder and drive the cylinder to rotate, so that the carbon fiber strip is wrapped and adhered to the carbon fiber winding area on the outer wall of the cylinder. In practice, the surface of the cylinder needs to be clean and free of contaminants before winding, and no release agents or similar substances are allowed. For the PPS material selected in this invention, the winding area of ​​the cylinder needs to be plasma treated before winding to make the surface tension reach 50 dyn / cm or higher, and the winding should be completed within 24 hours after the plasma treatment.

[0008] Specifically, in practice, a pneumatic expansion sleeve can be used to wind the mandrel, and the surface roughness of the mandrel should be controlled to <Ra0.2 to ensure uniform and stable support, and the smooth surface facilitates removal. The expansion sleeve and the inner cavity of the cylinder form a tight fit, providing uniform support to the cylinder and preventing the winding tension from squeezing the cylinder and causing uneven deformation, thus improving the winding quality of the carbon fiber and ensuring the reliability and stability of the carbon fiber shielding sleeve. After all winding processes are completed, the expansion sleeve and mandrel can be retracted and easily removed from the cylinder. During the winding process, the mandrel and the cylinder rotate synchronously, thereby rotating and winding the carbon fiber tape.

[0009] This invention specifically employs a wet winding process, with a preferred winding speed not exceeding 5.4 m / min. This ensures relatively uniform impregnation of the carbon fiber tape and prevents the adhesive adhering to the carbon fiber tape from being flung off during the winding process, guaranteeing safe and reliable production. Furthermore, the overlap rate of the carbon fiber tape is controlled at 5%-15%, such as 5%, 8%, 10%, 12%, and 15% in practice. This avoids defects caused by gaps due to equipment fluctuations or uneven carbon fiber tape arrangement, prevents waste of carbon fiber tape material and unnecessary weight increase, and avoids localized thickening in the overlap area, which could lead to stress concentration. This ensures the reliability and stability of the carbon fiber shielding sleeve.

[0010] S3. Perform full-coverage reciprocating rolling on the wound carbon fiber layer to break and expel tiny air bubbles; Specifically, after the carbon fiber tape is wound, a 50-100 Hz high-frequency oscillating roller can be used to perform at least one full-coverage reciprocating rolling on the newly wound carbon fiber layer. The roller is in contact with the cylinder using rubber material. Vibration energy is used to break and expel tiny air bubbles, ensuring the bonding quality between the carbon fiber tape and the cylinder layer, and ensuring the overall performance reliability and stability of the shielding sleeve.

[0011] S4. Send the cylinder with the carbon fiber layer wrapped around it into the curing oven for curing treatment.

[0012] Specifically, after removing air bubbles from the carbon fiber layer, a shaping film needs to be wrapped around the outside of the carbon fiber layer to prevent any undried adhesive from flowing out. High-temperature resistant OPP film, i.e., oriented polypropylene film, can be used as the shaping film. In practice, other materials or structural methods can also be used as the shaping film to prevent the adhesive from overflowing. After all the wrapping processes are completed, the core mold is removed, and the cylinder with the carbon fiber layer and shaping film wrapped around it is sent into the curing oven.

[0013] The temperature curve in the curing oven of this invention is as follows: First stage: initially heat to 80°C-90°C, which can be specifically controlled at 80°C, 85°C, 90°C, etc. in practice; Second stage: further heat to 120°C-130°C, which can be specifically controlled at 120°C, 125°C, 130°C, etc. in practice; Third stage: finally heat to 150°C-165°C, which can be specifically controlled at 150°C, 155°C, 160°C, 165°C, etc. Fourth stage: cool in the oven to below 60°C and then remove from the oven. The heating rate for all three heating stages was 1.5°C-3°C / min, and the holding time was 1.5h-3h. Specifically, the heating rate was controlled at 1.5°C / min, 2.0°C / min, 2.5°C / min, and 3°C / min, and the holding time was controlled at 1.5h, 2.0h, 2.5h, and 3h, respectively. The cylinder was placed vertically during the curing process. In practice, the performance of the cured carbon fiber shielding sleeve was found to be reliable and stable.

[0014] This invention uses an injection-molded cylinder as the base, on which carbon fiber tape is wet-wound and cured. The combination of the injection-molded cylinder and the carbon fiber layer forms a plastic shielding sleeve, ensuring the performance stability of the carbon fiber shielding sleeve. This helps reduce eddy current losses, improves motor efficiency, and achieves energy saving and consumption reduction goals. In practice, a thermosetting carbon fiber wet winding method can be used. After the winding layer is cured, the high tensile strength and high elastic modulus of carbon fiber are utilized to enable the reinforced plastic shielding sleeve to achieve the strength performance of a metal shielding sleeve, meeting various application conditions of the shielded pump. In practice, it can replace the metal shielding sleeve in application.

[0015] Furthermore, a thinner shielding sleeve wall thickness is more advantageous for controlling the air gap between the stator and rotor in the pump body. In this invention, the cylindrical wall thickness of the cylinder is controlled to be no more than 1.2 mm, while the wall thickness of other areas can be controlled to be 1.5 mm-2.5 mm, specifically 1.5 mm, 2.0 mm, 2.2 mm, 2.5 mm, etc. The other areas specifically refer to the areas where the stator and rotor do not overlap.

[0016] Furthermore, the injection molding of the cylinder can be carried out in different ways. For example, the cylinder can be molded from one end, with the front end being open and the rear end closed by an end cap. The inner diameter of the cylinder cavity gradually increases from the closed end to the open end, and the inclination angle of the inner wall is 0.2°-0.5°, specifically controlled at 0.2°, 0.4°, 0.5°, etc. The small draft angle of the inner wall of the cylinder results in a small change in the cylinder diameter, which helps to ensure stability during the carbon fiber winding process, ensures a more uniform outer diameter distribution of the shielding sleeve after winding, and also helps to reduce bulges and bubbles in the bonding between the cylinder and the carbon fiber, thus ensuring the quality of the carbon fiber winding bonding.

[0017] For a one-end demolding configuration, further, a radially protruding first convex ring is provided around the outer wall of the open end of the cylinder, and a tail flange extending axially beyond the end cap is provided at the closed end of the cylinder, forming a carbon fiber winding area between the first convex ring and the tail flange. Furthermore, a radially protruding second convex ring is also provided on the outer wall of the open end of the cylinder in front of the first convex ring, and a chamfered inclined wall is provided between the second convex ring and the inner cavity of the cylinder.

[0018] The above design, with its second convex ring at the open end, facilitates the stability and convenience of subsequent shielding sleeve sealing installation, and can be used to form an end-face sealing mating surface between the shielding sleeve and the front bearing housing inside the pump body. The first convex ring can position the starting position of carbon fiber winding, and the tail flange at the closed end effectively ensures the quality of the effective area of ​​carbon fiber winding, thereby guaranteeing the overall performance improvement of the carbon fiber shielding sleeve. The height of the first and second convex rings can be greater than 2.5mm. The separate arrangement of the first and second convex rings also helps to ensure uniform wall thickness.

[0019] Furthermore, the inner surface of the end cover is formed with an inner convex ring, and a rear bearing is pre-embedded and assembled in the inner convex ring; a boss is provided on the outer surface of the end cover at the position corresponding to the rear bearing, the inner diameter of the boss is not greater than the inner diameter of the rear bearing, and it communicates with the inner diameter of the rear bearing; an outer convex ring is also formed on the outer surface of the outer surface of the boss, and an annular cavity is formed between the outer convex ring and the tail flange. When the shielding sleeve is installed, a sealing element can be installed in the annular cavity to fit and seal with the end cover of the base.

[0020] Alternatively, the cylinder injection molding can also employ a two-end demolding method, with both ends of the cylinder being open. The front open end of the cylinder still features a radially protruding first ring for initial carbon fiber positioning. In this case, the pre-embedded bearing structure at the other end of the cylinder is eliminated, and the two-end demolding method facilitates cylinder injection molding, controls cylinder wall thickness, and reduces the diameter variation at both ends due to increased cylinder depth, ensuring uniform winding of the carbon fiber. Furthermore, since the pre-embedded bearing at the cylinder end is eliminated, the bearing support and fixation at the rear end of the motor shaft no longer relies on the structural strength of the shielding sleeve itself, which also contributes to stable rotor operation. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the carbon fiber shielding sleeve in the embodiment; Figure 2 for Figure 1 A magnified schematic diagram of the local structure at point A; Figure 3 This is a schematic diagram showing the installation state of the shielding sleeve in the pump unit in the embodiment; Figure 4 This is a cross-sectional view of the carbon fiber shielding sleeve in another embodiment; Figure 5 for Figure 4 A schematic diagram showing the installation status of the shielding sleeve in the pump unit.

[0022] Explanation of the labels in the diagram: 100. Cylinder body; 101. First convex ring; 102. Second convex ring; 103. Tail flange; 104. Inner convex ring; 105. Outer convex ring; 106. Annular cavity; 107. Boss portion; 108. Rear bearing; 109. Chamfered beveled wall; 110. End cover; 111. A sealing ring; 112. B sealing ring; 200. Machine base; 201. Rotor; 202. Machine base end cover; 203. Front bearing housing; 204. Front fixed bearing. Detailed Implementation

[0023] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings.

[0024] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] The present invention will be further described below with reference to embodiments.

[0026] Example Combination Figures 1-5 As shown, this embodiment provides a carbon fiber shielding sleeve manufacturing process, including: S1. Injection-molded cylindrical body 100 serves as the base material; S2. Set the core mold support cylinder 100 and drive the cylinder 100 to rotate, so that the carbon fiber strip is wound on the carbon fiber winding area on the outer wall of the cylinder 100. S3. Perform full-coverage reciprocating rolling on the wound carbon fiber layer to break and expel tiny air bubbles; S4. Remove the core mold and send the cylinder 100 with the carbon fiber layer wrapped around it into the curing oven for curing treatment.

[0027] More specifically, before winding the carbon fiber tape in step S2, the surface of the cylinder 100 needs to be cleaned. The carbon fiber winding area of ​​the cylinder 100 is then subjected to plasma treatment to achieve a surface tension of 50 dyn / cm or higher, ensuring stable winding and coverage of the carbon fiber tape. Winding must be completed within 24 hours after plasma treatment. In step S3, air bubble removal is performed. Specifically, a 50-100 Hz high-frequency oscillating roller is used to perform at least one full-coverage reciprocating rolling motion on the freshly wound carbon fiber layer. The roller contacts the cylinder with a rubber material, using vibration energy to break and expel tiny air bubbles. In step S4, before being sent to the curing oven, the mandrel continues to rotate the cylinder 100, further wrapping a shaping film around the outside of the carbon fiber layer to prevent glue leakage. Then, the mandrel is removed, and the cylinder 100, wrapped with the carbon fiber layer and shaping film, is sent to the curing oven. A high-temperature resistant OPP film, i.e., oriented polypropylene film, can be used as the shaping film. The temperature profile in the curing oven is as follows: First stage: Initially heat to 80°C-90°C, which can be controlled in practice at 80°C, 85°C, 90°C, etc.; Second stage: Further heat to 120°C-130°C, which can be controlled in practice at 120°C, 125°C, 130°C, etc.; Third stage: Finally heat to 150°C-165°C, which can be controlled in practice at 150°C, 155°C, 160°C, 165°C, etc.; Fourth stage: Cool in the oven to below 60°C before unloading. The heating rate for each of the three heating stages is 1.5°C-3°C / min, and the holding time is 1.5h-3h. Specifically, the heating rate can be controlled at 1.5°C / min, 2.0°C / min, 2.5°C / min, and 3°C / min, and the holding time can be controlled at 1.5h, 2.0h, 2.5h, and 3h, respectively. The cylinder is placed vertically during the curing process. The cured carbon fiber shielding sleeve exhibits stable and reliable performance.

[0028] In this embodiment, the carbon fiber tape employs a wet winding process with a winding speed not exceeding 5.4 m / min. This ensures relatively uniform impregnation of the carbon fiber tape and prevents the adhesive container from being thrown out during the winding process, guaranteeing safe and reliable production. Furthermore, the overlap rate of the carbon fiber tape is controlled within 5%-15%, such as 5%, 8%, 10%, 12%, and 15% in practice. This avoids defects caused by gaps due to equipment fluctuations or uneven carbon fiber arrangement, prevents waste of carbon fiber material and unnecessary weight increase, and avoids localized thickening in the overlap area, which could lead to stress concentration.

[0029] In practice, a pneumatic expansion sleeve can be used to wind the mandrel, and the surface roughness of the mandrel should be controlled to be <Ra0.2 to ensure uniform and stable support, and the surface is smooth for easy removal. The expansion sleeve and the inner cavity of the cylinder form a certain tight fit, which provides uniform support to the cylinder and avoids the winding tension from squeezing the cylinder and causing uneven deformation. After winding, the expansion sleeve mandrel can be retracted and removed smoothly, making it easy to remove from the cylinder.

[0030] In this embodiment, the preferred cylindrical wall thickness of the cylinder 100 is no greater than 1.2 mm. A thinner shielding sleeve wall thickness is more beneficial for controlling the air gap between the stator and rotor in the pump body. The wall thickness in other areas is 1.5 mm to 2.5 mm, specifically 1.5 mm, 2.0 mm, 2.2 mm, 2.5 mm, etc. The specific cylindrical wall thickness refers to the area where the motor stator and rotor axially overlap during installation in the canned motor pump, while the other areas refer to areas where the stator and rotor do not axially overlap.

[0031] For injection molding of the 100mm cylinder, in practice, either one-end ejection or double-end ejection can be used, combined with... Figures 1-3 As shown, the cylinder 100 can be formed by demolding from one end. In this case, the front end of the cylinder 100 is open, and the tail end is closed by the end cap 110. The inner diameter of the inner cavity of the cylinder 100 gradually increases from the closed end to the open end, and the inclination angle of the inner wall is 0.2°-0.5°. At this time, the draft angle of the inner wall of the cylinder 100 is small, and the diameter change of the cylinder 100 is small. This is conducive to ensuring the stability of the carbon fiber winding process, ensuring that the outer diameter distribution of the shielding sleeve after winding is relatively uniform, and also helps to reduce the occurrence of bulges, bubbles and other problems when the cylinder 100 and the carbon fiber are combined, thus ensuring the winding and bonding quality of the carbon fiber.

[0032] Furthermore, the outer wall of the open end of the cylinder 100 is provided with a radially protruding first convex ring 101, and the closed end of the cylinder 100 is provided with a tail flange 103 extending axially beyond the end cap 110. A carbon fiber winding area is formed between the first convex ring 101 and the tail flange 103. The first convex ring 101 can serve as the starting position for winding the carbon fiber strip, and the tail flange 103 extending beyond the end cap 110 can ensure the length of the effective winding area of ​​the carbon fiber.

[0033] Furthermore, a second convex ring 102 is radially protruding on the outer wall of the open end of the cylinder 100, located in front of the first convex ring 101. A chamfered inclined wall 109 is provided between the second convex ring 102 and the inner cavity of the cylinder 100. The first convex ring 101 can form a sealing mating surface with the front bearing seat in the pump body, and the chamfered inclined wall 109 is also beneficial for the sealing arrangement in the pump body. Furthermore, an inner convex ring 104 is formed on the inner side of the end cover 110, and a rear bearing 108 is pre-embedded and assembled in the inner convex ring 104; a boss portion 107 is provided on the outer side of the end cover 110 at a position corresponding to the rear bearing 108. The inner diameter of the boss portion 107 is not greater than the inner diameter of the rear bearing 108, and it communicates with the inner diameter of the rear bearing 108; an outer convex ring 105 is also formed on the outer side of the boss portion 107, and an annular cavity 106 is formed between the outer convex ring 105 and the tail flange 103. This design helps ensure a sealed assembly of the shielding sleeve within the pump body.

[0034] Specific combination Figure 3 As shown, this is the assembly state of the shielding sleeve inside the pump body. The pump body includes a base 200 and a pump casing. The motor shaft, rotor 201, and stator assembly are assembled in the inner cavity of the base 200. The carbon fiber shielding sleeve is placed between the rotor 201 and the stator assembly for isolation. The two ends of the motor shaft are supported and fixed by a front fixed bearing 204 and a rear bearing 108, respectively. The front fixed bearing 204 is fitted onto a front bearing seat 203. The front bearing seat 203 has an extension extending axially toward the inner cavity of the opening end of the cylinder 100. An A sealing ring 111 fits between the outer wall of this extension and the inner wall of the cylinder 100 to seal the radial gap between them. The chamfered beveled wall 109 facilitates the installation guidance of the A sealing ring 111. The side wall of the second convex ring 102 abuts tightly against the side wall of the front bearing seat 203 to form a sealing mating surface.

[0035] Regarding the closed end of the shielding sleeve, combined with Figure 3 As shown, the tail end of the motor shaft mates with the rear bearing 108 and extends into the boss portion 107, the inner diameter of which is larger than the diameter of the motor shaft. The tail end of the base 200 has a base end cover 202, and the inner side of the base end cover 202 has a protruding ring portion extending toward the annular cavity 106, which presses against the B sealing ring 112 disposed inside the annular cavity 106. In this way, after the shielding sleeve is installed, an elastic buffer fit is formed in the axial installation space between the shielding sleeve and the base 200, avoiding excessive compression of the shielding sleeve and helping to reduce the dimensional accuracy requirements of the parts.

[0036] Combination Figure 4 and Figure 5As shown, in practice, the cylinder 100 can also be formed by molding from both ends. In this case, both ends of the cylinder 100 are open, and the front open end of the cylinder 100 still has a radially protruding first convex ring 101 to position the initial winding position of the carbon fiber strip. In this case, the pre-embedded rear bearing 108 is eliminated from the cylinder 100. Molding from both ends helps to control the wall thickness of the cylinder 100 and reduces the change in diameter at both ends due to the increase in the depth of the cylinder 100, ensuring uniform winding of the carbon fiber. In addition, since the pre-embedded rear bearing 108 is eliminated at the end of the cylinder 100, the bearing support and fixation at the rear end of the motor shaft no longer depends on the structural strength of the shielding sleeve itself, which is also beneficial to the stable operation of the rotor.

[0037] This embodiment aims to use carbon fiber composite materials to manufacture shielding sleeves for key components. It combines the high specific strength, corrosion resistance, and low eddy current loss characteristics of carbon fiber materials, enabling the reinforced plastic shielding sleeve to achieve the strength performance of a metal shielding sleeve, thus meeting the various application conditions of the shielded pump.

[0038] The present invention and its embodiments have been described above illustratively. This description is not restrictive and is merely one embodiment of the present invention, and is not actually limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A process for manufacturing a carbon fiber shielding sleeve, characterized in that, include: S1, Injection-molded cylindrical body (100) as the base; S2. Set the core mold support cylinder (100) and drive the cylinder (100) to rotate, so that the carbon fiber strip is wound around the carbon fiber winding area on the outer wall of the cylinder (100); S3. Perform full-coverage reciprocating rolling on the wound carbon fiber layer to break and expel tiny air bubbles; S4. Remove the core mold and send the cylinder (100) with the carbon fiber layer wrapped around it into the curing oven for curing treatment.

2. The carbon fiber shielding sleeve manufacturing process according to claim 1, characterized in that: Before winding the carbon fiber tape in S2, the carbon fiber winding area of ​​the cylinder (100) is first subjected to plasma treatment to make the surface tension reach 50dyn / cm or above, and the winding is completed within 24 hours after plasma treatment.

3. The carbon fiber shielding sleeve manufacturing process according to claim 1, characterized in that: Before being sent into the curing oven in S4, a shaping film is first wrapped around the outside of the carbon fiber layer to prevent the adhesive from overflowing. Then, the core mold is removed, and the cylinder (100) wrapped with the carbon fiber layer and the shaping film is sent into the curing oven.

4. The carbon fiber shielding sleeve manufacturing process according to claim 1, characterized in that: The temperature profile in the curing oven of S4 is as follows: first, the temperature is raised to 80°C-90°C, then to 120°C-130°C, and finally to 150°C-165°C. The heating rate in each stage is 1.5°C-3°C / min, and the holding time is 1.5h-3h. Then, it is cooled in the oven to below 60°C and removed from the oven.

5. The carbon fiber shielding sleeve manufacturing process according to claim 1, characterized in that: S2 uses a wet winding process with a winding speed not exceeding 5.4 m / min and the overlap rate of the carbon fiber tape is controlled at 5%-15%. Or / and, the surface roughness of the core mold used in S2 is <Ra0.2; Or / and, the cylindrical wall thickness of the cylinder (100) is no more than 1.2 mm, and the wall thickness of the remaining areas is 1.5 mm to 2.5 mm.

6. A carbon fiber shielding sleeve manufacturing process according to any one of claims 1-5, characterized in that: The cylinder (100) is formed by molding from one end. The front end of the cylinder (100) is open, and the tail end is closed by end cap (110). The inner diameter of the inner cavity of the cylinder (100) gradually increases from the closed end to the open end, and the inclination angle of the inner wall is 0.2°-0.5°.

7. The carbon fiber shielding sleeve manufacturing process according to claim 6, characterized in that: The outer wall of the open end of the cylinder (100) is surrounded by a first protruding ring (101) that protrudes radially, and the closed end of the cylinder (100) is provided with a tail flange (103) that extends axially beyond the end cap (110). A carbon fiber winding area is formed between the first protruding ring (101) and the tail flange (103).

8. The carbon fiber shielding sleeve manufacturing process according to claim 7, characterized in that: A second protruding ring (102) is provided radially protruding on the outer wall of the opening end of the cylinder (100) in front of the first protruding ring (101), and a chamfered inclined wall (109) is provided between the second protruding ring (102) and the inner cavity of the cylinder (100).

9. The carbon fiber shielding sleeve manufacturing process according to claim 7, characterized in that: An inner convex ring (104) is formed on the inner side of the end cap (110), and a rear bearing (108) is pre-embedded in the inner convex ring (104); a boss (107) is provided on the outer side of the end cap (110) at the position corresponding to the rear bearing (108), the inner diameter of the boss (107) is not greater than the inner diameter of the rear bearing (108), and it communicates with the inner diameter of the rear bearing (108); an outer convex ring (105) is also formed on the outer side of the boss (107) on the outer side of the end cap (110), and an annular cavity (106) is formed between the outer convex ring (105) and the tail flange (103).

10. A carbon fiber shielding sleeve manufacturing process according to any one of claims 1-5, characterized in that: The cylinder (100) is formed by molding at both ends. Both ends of the cylinder (100) are open ends, and a radially protruding first protruding ring (101) is provided at the front open end of the cylinder (100).

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