High-temperature optical cable for aviation and preparation method thereof

Abstract

The invention relates to the technical field of aviation optical cables, in particular to a high-temperature optical cable for aviation and a preparation method of the high-temperature optical cable for aviation, and the high-temperature optical cable for aviation comprises a high-temperature optical fiber, a stainless steel loose sleeve protection tube, a fiber-woven reinforcement piece and a high-temperature-resistant polymer sheath, the stainless steel loose tube protection tube is sleeved with the fiber woven reinforcing piece, and the fiber woven reinforcing piece is sleeved with the high-temperature-resistant polymer sheath; according to the technical scheme, the temperature resistance grade of the aviation optical cable can be improved to 300 DEG C, and the product is small in structural size and light in weight and has good use characteristics of tensile strength, compression resistance, bending resistance and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation optical cables, and in particular to a high-temperature optical cable for aviation and a preparation method thereof. Background Art

[0002] Aviation optical cables have extremely high reliability and stability, and can work normally in harsh environments such as extreme temperature and high humidity. Secondly, aviation optical cables have excellent transmission performance, which can achieve high-speed and large-capacity data transmission, meeting the aviation field's needs for real-time and high-definition image transmission. In addition, aviation optical cables also have the advantages of small size, light weight, flexible and easy installation, and are widely used in aircraft. With the continuous advancement of science and technology, the aviation industry has an increasing demand for efficient, safe and reliable electromechanical equipment. Against this background, the upgrading of aviation optical cables is particularly important.

[0003] At present, high-speed technology is an important technology for aircraft. With the rapid development of the aviation field, all countries attach great importance to high-speed technology. When the speed exceeds Mach 2.5, the friction of gas molecules will cause aerodynamic heating, which will increase the surface temperature of the aircraft, up to 250℃~300℃, which is a great challenge to the temperature resistance level of aircraft structural materials. The existing aviation optical cable weighs ≤5g / m and has a diameter of ≤2.0mm. Due to material limitations, its temperature resistance level is -55℃~130℃, and it cannot be used in hypersonic aircraft with a maximum temperature of 250℃~300℃.

[0004] Therefore, how to improve the temperature resistance of aviation optical cables so that they can be used in hypersonic aircraft has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] The present invention provides a high-temperature optical cable for aviation and a preparation method thereof, which are used to improve the temperature resistance level of the optical cable for aviation so that the optical cable can be applied to hypersonic aircraft.

[0006] The present invention provides a high-temperature optical cable for aviation and a preparation method thereof, comprising: High temperature optical fiber; A stainless steel loose tube protective tube, wherein the stainless steel loose tube protective tube is sleeved on the high-temperature optical fiber; A fiber braided reinforcement member, wherein the fiber braided reinforcement member is sleeved on the stainless steel loose sleeve protection tube; High temperature resistant polymer sheath; the high temperature resistant polymer sheath is arranged on the fiber braided reinforcement.

[0007] In some of the embodiments, the high temperature optical fiber comprises: Fiber core; Cladding; the cladding is sleeved on the fiber core; Coating layer; the coating layer is coated on the outer surface of the cladding.

[0008] In some of the embodiments, the stainless steel loose tube protective tube is in a spiral shape.

[0009] In some embodiments, the high temperature optical fiber has a diameter of 155 μm±5 μm.

[0010] A method for preparing a high-temperature optical cable for aviation, comprising the following steps: S1. Use a CNC armored hose machine to flatten the stainless steel wire through a mold and form it into a stainless steel belt in a spiral shape to form a stainless steel loose tube protection tube. Thread the high-temperature optical fiber to the center of the CNC armored hose machine and bond it to the stainless steel loose tube protection tube. Then gradually bring in the high-temperature optical fiber for bonding and sleeve installation. S2. Use a braiding machine to braid polyimide aramid to form a fiber braided reinforcement and sleeve it on the stainless steel loose sleeve protection tube; S3, extruding the ECA material through a high temperature extruder to form a high temperature resistant polymer sheath; S4, through the high temperature oven, the internal crystals of the ECA high temperature resistant polymer sheath form epitaxial co-crystallization to complete the processing.

[0011] In some of the embodiments, in step S1, the high-temperature optical fiber is placed in a high-temperature optical fiber pay-off rack, a whole roll of stainless steel wire with a diameter of 0.55 mm is installed in a stainless steel wire installation tray, a flattening mold and a forming mold are installed, the protective cover is closed, and the electrical control switch of the equipment is turned on. When the equipment is turned on and the stainless steel loose tube protective tube is processed to 0.5 meters, the equipment is turned off, the protective cover is opened, and the high-temperature optical fiber is passed from the pay-off rack through the central conduit into the stainless steel loose tube protective tube, and the head of the high-temperature optical fiber is bonded to the stainless steel loose tube protective tube, and then the equipment is turned on. As the protective tube is processed, the high-temperature optical fiber is gradually brought into the interior of the protective tube, completing the processing of the stainless steel loose tube protective tube.

[0012] In some of the embodiments, the polyimide fiber is stranded onto a spindle, and the spindle is installed on a braiding machine. In step S2, the polyimide fiber is led out from the spindle, passed through a tension control guide wheel, led out from a wire groove, and fixed to a braiding point; each spindle is threaded and fixed with the polyimide fiber in the above manner, and after being fixed, the braiding machine is turned on, the upper spindle rotates clockwise, and the lower spindle rotates counterclockwise, the polyimide fiber is processed into a braided sleeve, and after braiding for a section, the equipment is stopped, a braiding mold is used, and installed into a mold base, and a stainless steel loose sleeve protective tube is threaded from the bottom to the braiding point. As the polyimide fiber sleeve is braided, the stainless steel loose sleeve protective tube is brought into the fiber sleeve to complete the braiding action of the fiber braiding reinforcement.

[0013] In some of the embodiments, the polyimide fiber used has a specification of 400 dtex, a braiding angle of less than 45°, and a braiding tension of 3N to 4N.

[0014] In some of the embodiments, in step S3, the ECA material is extruded into a sheath, and the sheath extrusion is performed using a high-temperature extruder, the maximum temperature of the extruder is set to 380°C to 400°C, the extrusion speed is 5m / min to 20m / min, and the cooling method adopts step-by-step cooling.

[0015] In some embodiments, in step S4, the treatment temperature is 280° C. to 310° C., and the treatment time is 120 h.

[0016] The beneficial effects of the present invention are as follows: With the existing high-temperature materials, the structural design of the present invention can improve the temperature resistance level of the optical cable, reduce the outer diameter, and make it more suitable for high-temperature use occasions in the aviation field. The stainless steel wire is deformed by extrusion, and a stainless steel loose tube protection tube is formed by a forming die; a reinforcement is formed by weaving polyimide fibers; a sheath is formed by high-temperature extrusion; and the sheath is processed twice by post-processing to form an epitaxial eutectic structure, ensuring that the optical cable can work stably for a long time under high temperature conditions. As a result, the temperature resistance level of the aviation optical cable can be increased to 300°C by the present invention. The product has a small structural size, light weight, and good tensile, compressive and bending properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a high-temperature optical cable for aviation use of the present invention; Figure 2 It is a schematic diagram of a process for preparing a high-temperature optical cable for aviation use according to the present invention; Figure 3 It is a structural schematic diagram of a high-temperature optical cable for aviation and a numerically controlled armored hose machine in a preparation method thereof of the present invention; Figure 4 It is a structural schematic diagram of a braiding machine in a high-temperature optical cable for aviation and a preparation method thereof of the present invention; In the attached drawings, 1, fiber core; 2, cladding; 3, coating layer; 4, stainless steel loose tube protection tube; 5, fiber braiding reinforcement; 6, high temperature resistant polymer sheath; 7, CNC armored hose machine; 71, high temperature optical fiber pay-off rack; 72-equipment base; 73-equipment electrical control switch; 74-flattening and forming mold; 75-protective cover; 76-stainless steel wire installation plate; 77-wire outlet hole; 8, braiding machine; 81-braiding machine upper spindle; 82-braiding machine lower spindle; 83-lower spindle baffle; 84-slide rail base; 85-wire trough; 86-mold base; 87-braiding mold; 88-polyimide fiber. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] At present, high-speed technology is an important technology for aircraft. With the rapid development of the aviation field, all countries attach great importance to high-speed technology. When the speed exceeds Mach 2.5, the friction of gas molecules will cause aerodynamic heating, which will increase the surface temperature of the aircraft, up to 250℃~300℃, which is a great challenge to the temperature resistance level of aircraft structural materials. The existing aviation optical cable weighs ≤5g / m and has a diameter of ≤2.0mm. Due to material limitations, its temperature resistance level is -55℃~130℃, and it cannot be used in hypersonic aircraft with a maximum temperature of 250℃~300℃; therefore, how to improve the temperature resistance level of aviation optical cables so that they can be used in hypersonic aircraft has become a technical problem that needs to be solved urgently by technicians in this field.

[0020] To solve the above problems, refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the present invention provides a high temperature optical fiber; A stainless steel loose tube protection tube 4, wherein the stainless steel loose tube protection tube 4 is sleeved on the high-temperature optical fiber; A fiber braided reinforcement member 5, wherein the fiber braided reinforcement member 5 is sleeved on the stainless steel loose sleeve protection tube 4; A high temperature resistant polymer sheath 6; the high temperature resistant polymer sheath 6 is sleeved on the fiber braided reinforcement 5; Preferably, the high temperature optical fiber comprises: Fiber core 1; Cladding 2; the cladding 2 is sleeved on the core 1; Coating layer 3; the coating layer 3 is coated on the outer surface of the cladding 2; Specifically, the material of the fiber core 1 and the cladding 2 is silicon dioxide, the material of the coating layer 3 is polyimide; the material of the stainless steel loose tube protection tube 4 is stainless steel, the material of the fiber braided reinforcement 5 is polyimide fiber 88, and the material of the high-temperature resistant polymer sheath 6 is high-temperature resistant fluoroplastic polymer (ECA), which is a composite of PTFE and PFA.

[0021] Preferably, the stainless steel loose tube protection tube 4 is in a spiral shape.

[0022] Preferably, the high temperature optical fiber has a diameter of 155 μm ± 5 μm; Specifically, the operating temperature is -65°C to 300°C, the bending radius is 9mm, the maximum working height is 28,000m, the weight is less than 5g / m, and the diameter is less than 1.8mm.

[0023] A method for preparing a high-temperature optical cable for aviation, comprising the following steps: S1. Use a CNC armored hose machine 7 to flatten the stainless steel wire through a mold and form it into a stainless steel belt in a spiral shape to form a stainless steel loose tube protection tube 4. Thread the high-temperature optical fiber to the center of the CNC armored hose machine 7 and bond it to the stainless steel loose tube protection tube 4. Then gradually bring in the high-temperature optical fiber for bonding and sleeve installation. S2, using a braiding machine 8 to braid polyimide aramid to form a fiber braided reinforcement 5 and sleeve it on the stainless steel loose sleeve protection tube 4; S3, extruding the ECA material through a high temperature extruder to form a high temperature resistant polymer sheath 6; S4, passing through a high temperature oven, so that the internal crystals of the ECA high temperature resistant polymer sheath 6 form epitaxial co-crystallization, and the processing is completed.

[0024] Preferably, in step S1, the high-temperature optical fiber is placed in a high-temperature optical fiber pay-off frame 71, a whole roll of stainless steel wire with a diameter of 0.55 mm is installed in a stainless steel wire installation disk 76, a flattening mold and a molding mold 74 are installed, the protective cover 75 is closed, and the electrical control switch 73 of the equipment is turned on. When the equipment is turned on and the stainless steel loose tube protective tube 4 is processed to 0.5 meters, the equipment is turned off, the protective cover 75 is opened, and the high-temperature optical fiber is passed from the pay-off frame 71 through the central conduit into the stainless steel loose tube protective tube 4, and the head of the high-temperature optical fiber is bonded to the stainless steel loose tube protective tube 4, and then the equipment is turned on. As the protective tube is processed, the high-temperature optical fiber is gradually brought into the interior of the protective tube, and the processing of the stainless steel loose tube protective tube is completed, wherein the high-temperature optical fiber pay-off frame 71, the flattening and molding mold 74, the protective cover 75 and the stainless steel wire installation disk 76 are all installed on the equipment base 72, the equipment electrical control switch 73 is used to control the start and stop of the equipment, and the outlet hole 77 is opened at the output end of the equipment.

[0025] Specifically, the stainless steel loose tube protection tube 4 is made of stainless steel wire with a diameter of 0.55 mm, which is flattened into a stainless steel strip with a width of 0.6 mm and a thickness of 0.16 mm. After being processed into a spiral shape, the pitch is 0.74 mm, the diameter of the spiral tube is 0.6 mm ± 0.02 mm, and the inner diameter is 0.28 mm ± 0.02 mm.

[0026] Preferably, in step S2, the polyimide fiber 88 is stranded onto a spindle, the spindle is installed onto a braiding machine 8, the polyimide fiber 88 is led out from the spindle, passed through a tension control guide wheel, led out from a wire groove 85, and fixed to a braiding point; each spindle is threaded and fixed with the polyimide fiber 88 in the above manner, and after being fixed, the braiding machine 8 is turned on, the upper spindle 81 rotates clockwise, and the lower spindle 82 rotates counterclockwise, the polyimide fiber 88 is processed into a braided sleeve, and after braiding for a section, the equipment is stopped, a braiding mold 87 is used, and installed into a mold base 86, the stainless steel loose sleeve protective tube 4 is threaded from below to the braiding point, and as the polyimide fiber sleeve is braided, the stainless steel loose sleeve protective tube 4 is brought into the fiber sleeve, completing the braiding action of the fiber braiding reinforcement 5; Specifically, after processing, the stainless steel loose tube protection tube 4 should avoid stress accumulation in its spiral, and the processed semi-finished product should naturally fall into a barrel. When the reinforcement 5 is braided, the semi-finished product of the stainless steel loose tube protection tube 4 is directly released from the barrel naturally to complete the release of torque and avoid the existence of torsional force in the optical cable. The grade of the above-mentioned stainless steel material is 204L, wherein a lower spindle baffle 83 is provided on one side of the braiding machine lower spindle 82, and the slide rail base is circumferentially arranged on the outside of the braiding machine upper spindle 81.

[0027] Preferably, the polyimide fiber 88 used has a specification of 400 dtex, a braiding angle less than 45°, and a braiding tension of 3N to 4N.

[0028] Preferably, in step S3, the ECA material is extruded into a sheath 6, and the sheath 6 is extruded using a high-temperature extruder, the maximum temperature of the extruder is set to 380° C. to 400° C., the extrusion speed is 5 m / min to 20 m / min, and the cooling method is step-by-step cooling; Specifically, the equipment used for cooling is a heating furnace, and the temperature is set to four sections of 250°C, 200°C, 150°C, and 100°C. Each cooling section is 2 meters long, completing the primary crystallization of the sheath 6 material.

[0029] Preferably, in step S4, the treatment temperature is 280°C to 310°C, and the treatment time is 120h; Specifically, the optical cable extruded through the sheath is subjected to a certain tension, and then rewound onto a reel made of aluminum alloy material, and the reel is placed in a high-temperature oven, and the temperature is set to 280℃~310℃ for 120 hours. When the time is up, the heating function of the high-temperature oven is turned off, and after the temperature inside the oven slowly drops to room temperature, the optical cable is taken out and the processing is completed. In this step, there is a certain tension inside the optical cable at high temperature, ensuring that the size of the optical cable sheath is stable and does not shrink under high temperature conditions; at the same time, under high temperature conditions, the PFA molecules are tightly coated on the outside of the PTFE crystal to form an epitaxial eutectic, and the stability of the epitaxial eutectic is improved by slow cooling.

[0030] In another embodiment, the selected high temperature optical fiber has a core 1 diameter of 9 μm, a cladding 2 diameter of 125 μm, a coating 3 diameter of 155 μm, and a transmission attenuation of 1.0 dB / km@1310 nm and 0.8 dB / km@1550 nm. The specific operation is as follows: (1) Processing of the stainless steel loose tube protective tube 4: Place the semi-finished high-temperature optical fiber into the high-temperature optical fiber pay-off rack 71, install the entire roll of stainless steel wire with a diameter of 0.55 mm into the stainless steel wire installation plate 76, select the gap of the flattening mold to be 0.16 mm, select the inner diameter of the forming mold 74 to be 0.605 mm, and install the flattening mold and the forming mold 74. Set the number of revolutions of the stainless steel hose processing equipment to 100 r / min and the pitch to 0.74 mm. When the stainless steel loose tube protective tube 4 is processed to 0.5 meters, turn off the equipment, open the protective cover 75, pass the high-temperature optical fiber from the pay-off rack 71 through the central conduit into the stainless steel loose tube protective tube 4, and bond the head of the high-temperature optical fiber to the stainless steel loose tube protective tube 4. Place a stainless steel barrel with a diameter of 500 mm at the outlet, then turn on the equipment to complete the processing of the stainless steel loose tube protective tube; (2) Processing of fiber braided reinforcement 5: 400 dtex polyimide fiber 88 is wound on the spindle through a doubling machine, and a 24-spindle braiding machine 8 is used, with the braiding pitch set to 12 mm and the braiding angle set to 20°. A handheld tension meter is used to adjust the tension of each spindle to 3N to 4N; the semi-finished product equipped with the stainless steel loose sleeve protection tube 4 is placed under the braiding machine, and the wire is released naturally to complete the processing of the fiber braided reinforcement 5; (3) Processing of high temperature resistant polymer sheath 6: A high temperature extruder is used, and the high temperature optical fiber pay-off frame 71 adopts an active pay-off method. The extruder temperature is set to 260°C, 300°C, 330°C, 360°C, 380°C, and 390°C respectively; a heating furnace is used in the cooling zone, and the temperature is set to 250°C, 200°C, 150°C, and 100°C. The extrusion screw speed is 2r / min; (4) Post-processing: Use a rewinding machine to rewind the optical cable after the sheath 6 is extruded. The reel used for rewinding is made of aluminum alloy, with a diameter of 400 mm and a tension of 10 N. The reel after rewinding is placed in a high-temperature oven. The temperature of the oven is set to 300°C for 120 hours. When the temperature is reached, the timing starts. When the time is reached, the heating function of the high-temperature oven is turned off. After the temperature inside the oven slowly drops to room temperature, the optical cable is taken out and the post-processing is completed.

[0031] In another embodiment, the selected high temperature optical fiber has a core 1 diameter of 50 μm, a cladding 2 diameter of 125 μm, a coating 3 diameter of 155 μm, and a transmission attenuation of 3.5 dB / km@850nm and 1.5 dB / km@1300nm. The specific operation is as follows: (1) Processing of the stainless steel loose tube protective tube 4: Place the semi-finished high-temperature optical fiber into the high-temperature optical fiber pay-off rack 71, install the entire roll of stainless steel wire with a diameter of 0.55 mm into the stainless steel wire installation plate 76, select the gap of the flattening mold to be 0.16 mm, select the inner diameter of the molding mold to be 0.605 mm, and install the flattening mold and the molding mold 74. Set the speed of the stainless steel hose processing equipment to 100 r / min and the pitch to 0.74 mm. When the stainless steel loose tube protective tube 4 is processed to 0.5 meters, turn off the equipment, open the protective cover 75, pass the high-temperature optical fiber from the pay-off rack 71 through the central conduit into the stainless steel loose tube protective tube 4, and bond the head of the high-temperature optical fiber to the stainless steel loose tube protective tube 4. Place a stainless steel barrel with a diameter of 500 mm at the outlet, then turn on the equipment to complete the processing of the stainless steel loose tube protective tube; (2) Processing of fiber braided reinforcement 5: Through the winding machine, 400dtex polyimide fiber 88 is wound on the spindle, and a 24-spindle braiding machine 8 is used, with the braiding pitch set to 12mm and the braiding angle set to 20°. Use a handheld tension meter to adjust the tension of each spindle to 3N~4N. Place the semi-finished product equipped with the stainless steel loose sleeve protection tube 4 under the braiding machine, and let out the wire naturally to complete the processing of the fiber braided reinforcement 5; (3) Processing of high temperature resistant polymer sheath 6: A high temperature extruder is used, and the high temperature optical fiber pay-off frame 71 adopts an active pay-off method. The extruder temperature is set to 260°C, 300°C, 330°C, 360°C, 380°C, and 390°C respectively; a heating furnace is used in the cooling zone, and the temperature is set to 250°C, 200°C, 150°C, and 100°C. The extrusion screw speed is 2r / min.

[0032] (4) Post-processing: Use a rewinding machine to rewind the optical cable after the sheath 6 is extruded. The reel used for rewinding is made of aluminum alloy, with a diameter of 400 mm and a tension of 10 N. The reel after rewinding is placed in a high-temperature oven. The temperature of the oven is set to 300°C for 120 hours. When the temperature is reached, the timing starts. When the time is reached, the heating function of the high-temperature oven is turned off. After the temperature inside the oven slowly drops to room temperature, the optical cable is taken out and the post-processing is completed.

[0033] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0037] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A high temperature optical cable for aviation, characterized in that: include: High temperature optical fiber; A stainless steel loose tube protective tube (4), wherein the stainless steel loose tube protective tube (4) is sleeved on the high-temperature optical fiber; A fiber braided reinforcement member (5), wherein the fiber braided reinforcement member (5) is sleeved on the stainless steel loose sleeve protective tube (4); A high temperature resistant polymer sheath (6); the high temperature resistant polymer sheath (6) is sleeved on the fiber braided reinforcement (5).

2. The high temperature optical cable for aviation according to claim 1, characterized in that: The high temperature optical fiber comprises: Fiber core (1); A cladding (2); the cladding (2) is sleeved on the fiber core (1); A coating layer (3); the coating layer (3) is coated on the outer surface of the cladding (2).

3. The high temperature optical cable for aviation according to claim 1, characterized in that: The stainless steel loose sleeve protective tube (4) is in a spiral shape.

4. The high temperature optical cable for aviation according to claim 1, characterized in that: The high temperature optical fiber has a diameter of 155 μm±5 μm.

5. A method for preparing a high-temperature optical cable for aviation, which is realized by using a high-temperature optical cable for aviation according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Using a CNC armored hose machine (7), the stainless steel wire is flattened through a mold and formed into a stainless steel strip in a spiral shape to form a stainless steel loose tube protective tube (4). The high-temperature optical fiber is threaded into the center of the CNC armored hose machine (7) and bonded to the stainless steel loose tube protective tube (4). Then, the high-temperature optical fiber is gradually brought in for bonding and sleeve installation. S2, using a braiding machine (8) to braid polyimide aramid to form a fiber braided reinforcement member (5) and sleeve it on the stainless steel loose sleeve protection tube (4); S3, extruding the ECA material through a high temperature extruder to form a high temperature resistant polymer sheath (6); S4, passing through a high temperature oven, so that the internal crystals of the ECA high temperature resistant polymer sheath (6) form epitaxial co-crystallization, and the processing is completed.

6. The method for preparing a high-temperature optical cable for aviation according to claim 5, characterized in that: In step S1, the high-temperature optical fiber is placed in a high-temperature optical fiber pay-off frame (71), a whole roll of stainless steel wire with a diameter of 0.55 mm is installed in a stainless steel wire installation plate (76), a flattening mold and a forming mold (74) are installed, the protective cover (75) is closed, and the electrical control switch (73) of the equipment is turned on. When the stainless steel loose tube protective tube (4) is processed to 0.5 meters, the equipment is turned off, the protective cover (75) is opened, and the high-temperature optical fiber is passed from the pay-off frame (71) through the central guide tube into the stainless steel loose tube protective tube (4), and the head of the high-temperature optical fiber is bonded to the stainless steel loose tube protective tube (4). Then, the equipment is turned on, and the high-temperature optical fiber is gradually brought into the interior of the protective tube as the protective tube is processed, thereby completing the processing of the stainless steel loose tube protective tube (4).

7. The high-temperature optical cable for aviation and the method for preparing the same according to claim 5, characterized in that: In step S2, the polyimide fiber (88) is stranded onto a spindle, the spindle is mounted onto a braiding machine (8), the polyimide fiber (88) is led out from the spindle, passed through a tension control guide wheel, led out from a wire slot (85), and fixed to a braiding point; each spindle is threaded and fixed with the polyimide fiber (88) in the above manner, and after being fixed, the braiding machine is turned on, the upper spindle (81) rotates clockwise, and the lower spindle (82) rotates counterclockwise, the polyimide fiber (88) is processed into a braided sleeve, and after braiding for a section, the equipment is stopped, a braiding mold (87) is used, and installed into a mold base (86), and a stainless steel loose sleeve protective tube (4) is threaded from the bottom to the braiding point, and as the polyimide fiber sleeve is braided, the stainless steel loose sleeve protective tube (4) is brought into the fiber sleeve, completing the braiding action of the fiber braiding reinforcement (5).

8. The high-temperature optical cable for aviation and the method for preparing the same according to claim 5, characterized in that: The polyimide fiber (88) used has a specification of 400 dtex, a weaving angle of less than 45°, and a weaving tension of 3N to 4N.

9. The high-temperature optical cable for aviation and the method for preparing the same according to claim 5, characterized in that: In step S3, the ECA material is extruded into a high temperature resistant polymer sheath (6). The high temperature resistant polymer sheath (6) is extruded using a high temperature extruder. The maximum temperature of the extruder is set at 380° C. to 400° C., the extrusion speed is 5 m / min to 20 m / min, and the cooling method is step-by-step cooling.

10. The high-temperature optical cable for aviation and the method for preparing the same according to claim 5, characterized in that: In step S4, the treatment temperature is 280°C to 310°C, and the treatment time is 120 hours.

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