High-temperature-resistant coaxial insulated signal cable and manufacturing method thereof

Abstract

The invention discloses a high-temperature-resistant coaxial insulation signal cable and a manufacturing method thereof, and relates to the technical field of signal transmission cables. The cable specifically comprises a signal line, a signal layer, an insulating layer and an outer sheath. The signal layer is arranged outside the signal line and is concentric with the signal line; the insulating layer wraps the peripheral walls of the signal line and the signal layer; the outer sheath wraps the outermost insulating layer; wherein the inner core cable and the coaxial cable both adopt a drawing and annealing alternating processing mode to form a signal cable with the outer diameter smaller than 3.0 mm. A signal cable with the outer diameter smaller than 3.0 mm is produced by combining a drawing mode and an annealing mode, so that the cable can fully meet the flexibility requirement and can meet the overall high-temperature-resistant performance, and when a high-temperature-resistant device is used, the problems that the high-temperature-resistant cable is poor in flexibility and prone to breakage during wiring bending are effectively solved, and the service life of the high-temperature-resistant device is prolonged. Wire harness operation after installation is improved, and reservation of follow-up maintenance space is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of signal transmission cables, and in particular to a high temperature resistant coaxial insulated signal cable and a manufacturing method thereof. Background Art

[0002] With the vigorous development of contemporary industrial technology, the requirements for wired signal transmission cables are becoming more and more diverse. Among them, coaxial cable is a cable composed of two coaxial conductors. It has the characteristics of low loss, high isolation, strong anti-interference ability and ultra-bandwidth during signal transmission, and can effectively transmit various digital signals and analog signals.

[0003] There are various types of transmission cables on the market, each with different applicable environments. The coaxial cables sold on the market or mentioned in various authorized patents have insulation layers and protective covers made of high molecular polymers, which determines that their maximum operating environment cannot exceed 300°C. If the temperature exceeds this, the insulation performance and mechanical strength of the signal transmission line will be reduced, and it cannot meet the high temperature environment of more than 300°C, so the signal cable needs to be improved accordingly.

[0004] According to the development of market conditions, the inventor concluded that the high-temperature resistant signal cables sold on the market use mineral insulated cables to achieve high-temperature resistance. In order to ensure the fire resistance of mineral insulated cables, multiple fireproof layers are added inside the mineral cables. In order to improve the electrical conductivity of the cables, the outer diameter of the cable core is also increased. However, some customers use them in complex environments. For example, they are used in equipment that works in an environment below 600°C. Certain wiring processing is required in the equipment. Mineral insulated cables with large outer diameters have poor flexibility and are difficult to adapt to wiring operations in the equipment, thereby increasing the difficulty of wiring operations for customers. At the same time, due to the poor flexibility of mineral insulated cables, after installation in the equipment, the mineral cables are difficult to organize in the equipment, making the mineral cables complicated after use. In addition, mineral cables are not easy to bend, making it difficult to achieve wiring harness operations, which hinders the space for subsequent maintenance and processing.

[0005] Therefore, the present application aims to improve the flexibility of signal transmission lines in working equipment under working environment conditions of 600°C, while facilitating the wiring harness operation of the equipment and helping to reserve space for subsequent maintenance. Summary of the invention

[0006] The main purpose of the present invention is to provide a high-temperature resistant coaxial insulated signal cable and a manufacturing method thereof, which is intended to improve the flexibility of the signal transmission line in a working device working in an environment of 600°C, facilitate the wiring harness operation of the device, and help reserve space for subsequent maintenance.

[0007] In order to achieve the above object, the present invention provides a high temperature resistant coaxial insulated signal cable, including a signal cable, wherein the signal cable includes:

[0008] Signal line;

[0009] A signal layer, arranged outside the signal line and concentric with the signal line;

[0010] an insulating layer, wrapped around the signal line and the outer peripheral wall of the signal layer; and

[0011] An outer sheath, wrapped around the outermost insulating layer;

[0012] Among them, the signal line, the signal layer and the insulating layer therebetween form an inner core cable, the inner core cable, the outer sheath and the insulating layer therebetween form a coaxial cable, and the inner core cable and the coaxial cable are both processed by alternating drawing and annealing to form a signal cable with an outer diameter less than 3.0 mm.

[0013] Furthermore, at least one end of the signal cable is provided with a sealing member, and the sealing member is used to seal the end of the signal cable.

[0014] Furthermore, the seal includes a sealing joint with an open space and a second terminal, one end of the second terminal is pressed against the end of the signal cable, and the pressing area is located in the open space of the sealing joint, and the other end of the second terminal extends out of the open space of the sealing joint.

[0015] Furthermore, the signal line extends from the end of the signal cable to the open space of the sealing joint and is provided with a first terminal.

[0016] The present application also discloses a cable manufacturing method, which manufactures the high temperature resistant coaxial insulated signal cable as described above, comprising the following steps:

[0017] Step S1: In the inner core cable, the signal layer, the insulation layer and the signal line select a metal tube, an insulation part and a core rod in turn, and the core rod penetrates the insulation part and is assembled on the inner wall of the metal tube;

[0018] Step S2: alternately drawing and annealing the inner core cable, wherein the elongation of each drawing pass of the inner core cable is 18% to 22%, and the annealing temperature is 550° C. to 650° C., until the outer diameter is 4.0 mm to 4.5 mm, then the drawing is stopped;

[0019] Step S3: straightening the inner core cable. In the coaxial cable, the outer sheath and the insulating layer are selected from the pipe and the insulating member in turn. The inner core cable passes through the insulating member and is assembled on the inner wall of the pipe.

[0020] Step S4: The coaxial cable is alternately drawn and annealed, with the elongation of the coaxial cable being 13% to 19% in each pass and the annealing temperature being 950° C. to 1100° C., until the outer diameter of the coaxial cable is 2.0 mm to 3.0 mm, and then the drawing is stopped.

[0021] Furthermore, the step S4 further includes:

[0022] When the outer diameter of the coaxial cable is greater than 4.0 mm, the coaxial cable is annealed once for each drawing pass; when the outer diameter of the coaxial cable is less than 4.0 mm, the coaxial cable is annealed once for each two drawing passes.

[0023] Further, in step S4, the annealing speed of the coaxial cable is 0.4 to 2.2 m / mim.

[0024] Furthermore, the end of the coaxial cable is filled with a sealing material, and the sealing material melts and solidifies the end of the coaxial cable.

[0025] Furthermore, the sealing material is glass powder.

[0026] The above technical solution has the following advantages:

[0027] The present invention realizes the transmission of two groups of signals by wrapping the signal line with a signal layer, combining drawing and annealing to produce a signal cable with an outer diameter less than 3.0 mm, so that the cable can fully meet its flexibility requirements while also meeting the overall high temperature resistance performance. When the high temperature resistant device is in use, it effectively solves the problem of poor flexibility of the high temperature resistant cable, which is easy to bend and break during wiring, improves the operation of the wiring harness after installation, and helps to reserve space for subsequent maintenance.

[0028] The present invention uses a sealing joint to seal both ends of the cable, uses high temperature to remove moisture, and uses a sealing material to seal the ends of the cable, which can effectively avoid the problem of the ends of the cable being damp and avoid the problem of loose ceramic welding in the original. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0030] Figure 1 It is a structural schematic diagram of the present invention;

[0031] Figure 2 It is a schematic diagram of the local structure of the present invention;

[0032] Figure 3 The figure is a process route diagram of the preparation method of the present invention.

[0033] In the figure: 1, signal cable; 11, first signal line; 12, first insulation layer; 13, second signal line; 14, second insulation layer; 15, outer sheath; 2, sealing member; 21, sealing joint; 22, sealing material; 23, first terminal; 24, second terminal. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and do not constitute a limitation to the present invention.

[0035] like Figure 1 and Figure 2 As shown, a high-temperature resistant coaxial insulated signal cable includes a signal cable 1, and the signal cable 1 includes a signal line, a signal layer, an insulating layer and an outer sheath 15; the signal layer is arranged on the outside of the signal line and is concentric with the signal line; the insulating layer is wrapped around the outer peripheral wall of the signal line and the signal layer; the outer sheath 15 is wrapped around the outermost insulating layer; wherein, the signal line, the signal layer and the insulating layer therebetween form an inner core cable, and the inner core cable, the outer sheath 15 and the insulating layer therebetween form a coaxial cable, and both the inner core cable and the coaxial cable are processed by alternating drawing and annealing to form a signal cable 1 with an outer diameter less than 3.0 mm. The signal line is used to transmit electrical signals. In the present application, the signal line is the first signal line 11, and the signal layer is the second signal line 13. There can be multiple second signal lines 13. In the present application, the second signal line 13 is arranged outside the first signal line 11 and is arranged concentrically with the first signal line 11. A first insulating layer 12 is also arranged between the first signal line 11 and the second signal line 13. A second insulating layer 14 is arranged outside the second signal line 13, and an outer sheath 15 is wrapped on the second insulating layer 14 to play a protective role. If there is a third signal line, the third signal line is arranged between the outer sheath 15 and the second insulating layer 14, and a third insulating layer is arranged between the third signal line and the outer sheath 15. By analogy, a coaxial cable with multiple signal lines can be formed.

[0036] In addition to the drawing and annealing methods, the signal cable 1 can also be produced by extrusion. In the present application, the signal cable 1 is preferably processed by drawing and annealing, and the cable with an outer diameter less than 3.0 mm is produced as much as possible.

[0037] like Figure 1 and Figure 2As shown, at least one end of the signal cable 1 is provided with a seal 2, and the seal 2 is used to seal the end of the signal cable 1. Among them, the seal 2 can be provided at one or both ends of the signal cable 1, and the seal 2 can be in the form of a sealing sleeve or a sealant. In the present application, a sealing joint 21 is preferably used. Specifically, the seal 2 includes a sealing joint 21 with an open space. Taking two groups of signal lines as an example, the signal lines extend from the ends of the signal cable 1 to the open space of the sealing joint 21, and are respectively covered with a first terminal 23 and a second terminal 24. The compression areas of the first terminal 23 and the second terminal 24 are both located in the open space of the sealing joint 21, and the other end of the second terminal 24 extends out of the open space of the sealing joint 21. The open space of the sealing joint 21 can be filled with sealing material, and the sealing material seals the connection end of the first terminal 23 and the second terminal 24, so as to achieve moisture-proof and sealing effects.

[0038] A cable manufacturing method, manufacturing the high temperature resistant coaxial insulated signal cable as mentioned above, comprises the following steps:

[0039] Step S1: The inner core cable selects a metal tube, an insulating member and a core rod, wherein the core rod penetrates the insulating member and is assembled on the inner wall of the metal tube;

[0040] Step S2: alternately drawing and annealing the inner core cable, wherein the elongation of each drawing pass of the inner core cable is 18% to 22%, and the annealing temperature is 550° C. to 650° C., until the outer diameter is 4.0 mm to 4.5 mm, then the drawing is stopped;

[0041] Step S3: straightening the inner core cable, selecting a pipe and an insulating member, passing the inner core cable through the insulating member, and assembling it on the inner wall of the pipe to form a coaxial cable;

[0042] Step S4: The coaxial cable is alternately drawn and annealed, with the elongation of the coaxial cable being 13% to 19% in each pass and the annealing temperature being 950° C. to 1100° C., until the outer diameter of the coaxial cable is 2.0 mm to 3.0 mm, and then the drawing is stopped.

[0043] In step S1, the metal tube is preferably a copper tube or a silver tube, preferably a copper tube; the insulating member is preferably a prefabricated insulating porcelain column, cross-linked polyethylene, or silicone rubber, preferably a prefabricated insulating porcelain column; the core rod can be a copper wire, a silver-plated conductor, or a carbon fiber composite material.

[0044] In step S4, when the outer diameter of the coaxial cable is greater than 4.0 mm, the coaxial cable is annealed once for each drawing pass; when the outer diameter of the coaxial cable is less than 4.0 mm, the coaxial cable is annealed once for each two drawing passes. The annealing speed of the coaxial cable is 0.4 to 2.2 m / mim. The end of the coaxial cable is filled with a sealing material 22, and the sealing material 22 melts and solidifies the end of the coaxial cable.

[0045] The sealing material 22 can be made of ferrite or ceramic material, preferably glass powder, which is melted and sealed at the end of the signal cable 1 by high-frequency heating. The specific scheme is as follows:

[0046] like Figure 3 As shown, as embodiment 1 of the present application

[0047] The inner core cable is set to have an outer diameter of 4.0 mm, and the inner core cable includes a first signal line 11, a first insulating layer 12, and a second signal line 13. The second signal line 13 selects a copper tube with an outer diameter of 25.4 mm, and the first signal line 11 and the first insulating layer 12 respectively select a pure copper core rod and a prefabricated insulating porcelain column. The copper tube is assembled with a prefabricated insulating porcelain column and a pure copper core rod with a specification of 20 mm*1 mm*5.0 mm. The calculation meets the assembly requirements, and the outer diameter of the core rod is 3.6±0.2 mm.

[0048] According to the process of 22.8mm, 20.4mm, 18.4mm, 16.6mm, 15.0mm, 13.5mm, 12.5mm, 11.4mm, 10.3mm, 9.4mm, 8.5mm, 7.7mm, 7.0mm, 6.4mm, 5.8mm, 5.3mm, 4.8mm, 4.4mm, 4.0mm, the inner core cable is drawn on the stretching machine, and the cable is annealed once every two drawing passes, and the annealing temperature is 550 to 650°C. When the outer diameter of the inner core cable is 4.0mm, the drawing is stopped.

[0049] After drawing, the inner core cable is straightened. According to the set outer diameter and calculation, the second insulating layer 14 and the outer sheath 15 respectively select prefabricated magnesium oxide insulating porcelain columns and pipes with an outer diameter of 12.7±0.1mm. The interior of the pipe is assembled with prefabricated magnesium oxide insulating porcelain columns and inner core cables with specifications of 9.5mm*1mm*6mm to form a coaxial cable.

[0050] The coaxial cable is drawn according to 11.4mm, 10.3mm, 9.4mm, 8.5mm, 7.7mm, 7.0mm, 6.4mm, 5.8mm, 5.3mm, 4.8mm, 4.4mm, 4.1mm, 3.8mm, 3.5mm, 3.2mm, 2.9mm, 2.7mm, and 2.5mm. When the outer diameter of the coaxial cable is above 4.0mm, it is annealed in a tubular furnace once for each drawing; when the outer diameter of the coaxial cable is less than 4.0mm, it is annealed once for each two drawing. The annealing speed is 0.4 to 2.2m / min. The smaller the outer diameter of the coaxial cable, the faster the annealing speed; the annealing temperature is 950℃ to 1100℃.

[0051] After multiple drawing and annealing, the finished cable has an outer diameter of 2.5mm. After passing the test, take a 10m long finished cable, remove the inner and outer sheaths 15 at both ends, expose 5mm to 9mm of the copper tube, and expose 20mm to 25mm of the pure copper core rod.

[0052] Install the 316L tail sealing pot onto the cable, and measure a length of 14 mm to 18 mm from the tail end of the outer sheath 15 and mark it as a fixing identification point for the sealing pot.

[0053] A 25mm to 30mm long special-shaped lead-out terminal, i.e., the second terminal 24, is installed on the copper tube and compressed with a crimping pliers; then a 20mm to 25mm long nickel tube, i.e., the first terminal 23, is crimped onto the pure copper core rod. After being led out, the nickel tube is 2mm to 3mm longer than the special-shaped terminal.

[0054] Move the sealing can to the marking point, align the tail end with the marking point, and press it tightly with air pressure pliers.

[0055] Use a heat gun to remove moisture from the cable cutout at a distance of 30cm to 50cm, and measure the insulation resistance. After the cable insulation treatment is qualified, seal the glass powder on the sealing joint 21 can and heat the glass powder by high-frequency heating. After the glass powder is melted, slowly cool and solidify. Repeat this 3 to 4 times until the molten and solidified glass powder completely fills the sealing joint 21.

[0056] After sealing is completed, the sealing joint 21 is polished, and after being immersed in water for 1 hour, the insulation resistance at room temperature and the insulation resistance at a high temperature of more than 300°C are measured.

[0057] like Figure 3 As shown, as embodiment 2 of the present application

[0058] According to calculation, the outer diameter of the inner core cable is set to 4.0mm. The inner core cable includes a first signal line 11, a first insulating layer 12 and a second signal line 13. The second signal line 13 selects a copper tube with an outer diameter of 25.4mm. The first signal line 11 and the first insulating layer 12 respectively select pure copper core rods and prefabricated insulating porcelain columns. The copper tube is assembled with prefabricated insulating porcelain columns and pure copper core rods with specifications of 20mm*1mm*5.0mm. According to calculation and to meet assembly requirements, the outer diameter of the core rod is 3.6±0.2mm.

[0059] According to the process of 22.8mm, 20.4mm, 18.4mm, 16.6mm, 15.0mm, 13.5mm, 12.5mm, 11.4mm, 10.3mm, 9.4mm, 8.5mm, 7.7mm, 7.0mm, 6.4mm, 5.8mm, 5.3mm, 4.8mm, 4.4mm, 4.0mm, the inner core cable is drawn on the stretching machine, and the cable is annealed once every two drawing passes, and the annealing temperature is 550 to 650°C. When the outer diameter of the inner core cable is 4.0mm, the drawing is stopped.

[0060] The inner core cable is straightened after drawing. According to the set outer diameter and calculation, the second insulating layer 14 and the outer sheath 15 respectively select prefabricated magnesium oxide insulating porcelain columns and pipes with an outer diameter of 11.5±0.1mm. The pipes are assembled with prefabricated magnesium oxide insulating porcelain columns and inner core cables with specifications of 8.5mm*1mm*6mm to form a coaxial cable.

[0061] The coaxial cable is drawn according to 10.3mm, 9.4mm, 8.5mm, 7.7mm, 7.0mm, 6.4mm, 5.8mm, 5.3mm, 4.8mm, 4.4mm, 4.1mm, 3.8mm, 3.5mm, 3.2mm, 2.9mm, 2.7mm, 2.5mm, and 2.3mm. When the outer diameter of the coaxial cable is above 4.0mm, it is annealed in a tubular furnace once for each drawing; when the outer diameter of the coaxial cable is less than 4.0mm, it is annealed once for each two drawing. The annealing speed is 0.4 to 2.2m / min. The smaller the outer diameter of the coaxial cable, the faster the annealing speed; the annealing temperature is 950℃ to 1100℃.

[0062] After multiple drawing and annealing, the finished cable has an outer diameter of 2.3mm. After passing the test, take a 10m long finished cable, remove the inner and outer sheaths 15 at both ends, expose 5mm to 9mm of the copper tube, and expose 20mm to 25mm of the pure copper core rod.

[0063] Install the 316L tail sealing pot onto the cable, and measure a length of 14 mm to 18 mm from the tail end of the outer sheath 15 and mark it as a fixing identification point for the sealing pot.

[0064] A 25mm to 30mm long special-shaped lead-out terminal, i.e., the second terminal 24, is installed on the copper tube and compressed with a crimping pliers; then a 20mm to 25mm long nickel tube, i.e., the first terminal 23, is crimped onto the pure copper core rod. After being led out, the nickel tube is 2mm to 3mm longer than the special-shaped terminal.

[0065] Move the sealing can to the marking point, align the tail end with the marking point, and press it tightly with air pressure pliers.

[0066] Use a heat gun to remove moisture from the cable cutout at a distance of 30cm to 50cm, and measure the insulation resistance. After the cable insulation treatment is qualified, seal the glass powder on the sealing joint 21 can and heat the glass powder by high-frequency heating. After the glass powder is melted, slowly cool and solidify. Repeat this 3 to 4 times until the molten and solidified glass powder completely fills the sealing joint 21.

[0067] After sealing is completed, the sealing joint 21 is polished, and after being immersed in water for 1 hour, the insulation resistance at room temperature and the insulation resistance at a high temperature of more than 300°C are measured.

[0068] like Figure 3 As shown, as embodiment 3 of the present application

[0069] According to calculation, the inner core cable is set to have an outer diameter of 4.0 mm. The inner core cable includes a first signal line 11, a first insulating layer 12 and a second signal line 13. The second signal line 13 selects a copper tube with an outer diameter of 25.4 mm, and the first signal line 11 and the first insulating layer 12 respectively select a pure copper core rod and a prefabricated insulating porcelain column. The copper tube is assembled with a prefabricated insulating porcelain column and a pure copper core rod with a specification of 20 mm*1 mm*5.0 mm. According to calculation, the assembly requirements are met, and the outer diameter of the core rod is 3.6±0.2 mm.

[0070] According to the process of 22.8mm, 20.4mm, 18.4mm, 16.6mm, 15.0mm, 13.5mm, 12.5mm, 11.4mm, 10.3mm, 9.4mm, 8.5mm, 7.7mm, 7.0mm, 6.4mm, 5.8mm, 5.3mm, 4.8mm, 4.4mm, 4.0mm, the inner core cable is drawn on the stretching machine, and the cable is annealed once every two drawing passes, and the annealing temperature is 550 to 650°C. When the outer diameter of the inner core cable is 4.0mm, the drawing is stopped.

[0071] The inner core cable is straightened after drawing. According to the set outer diameter and calculation, the second insulating layer 14 and the outer sheath 15 respectively select prefabricated magnesium oxide insulating porcelain columns and pipes with an outer diameter of 10.0±0.1mm. The pipes are assembled with prefabricated magnesium oxide insulating porcelain columns and inner core cables with specifications of 7.5mm*1mm*5.5mm to form a coaxial cable.

[0072] The coaxial cable is drawn according to 8.5mm, 7.7mm, 7.0mm, 6.4mm, 5.8mm, 5.3mm, 4.8mm, 4.4mm, 4.1mm, 3.8mm, 3.5mm, 3.2mm, 2.9mm, 2.7mm, 2.5mm, 2.3mm, and 2.1mm. When the outer diameter of the coaxial cable is above 4.0mm, it is annealed in a tubular furnace once for each drawing; when the outer diameter of the coaxial cable is less than 4.0mm, it is required to be annealed once for each two drawing. The annealing speed is 0.4 to 2.2m / min. The smaller the outer diameter of the cable, the faster the annealing speed; the annealing temperature is 950℃ to 1100℃.

[0073] After multiple drawing and annealing, the finished cable has an outer diameter of 2.1mm. After passing the test, take a 10m long finished cable, remove the inner and outer sheaths 15 at both ends, expose 5mm to 9mm of the copper tube, and expose 20mm to 25mm of the pure copper core rod.

[0074] Install the 316L end sealing pot on the cable, and measure the length of 14mm to 18mm from the end of the outer sheath 15 and mark it as the fixing identification point of the sealing pot.

[0075] A 25mm to 30mm long special-shaped lead-out terminal, i.e., the second terminal 24, is installed on the copper tube and compressed with a crimping pliers; then a 20mm to 25mm long nickel tube, i.e., the first terminal 23, is crimped onto the pure copper core rod. After being led out, the nickel tube is 2mm to 3mm longer than the special-shaped terminal.

[0076] Move the sealing can to the marking point, align the tail end with the marking point, and press it tightly with air pressure pliers.

[0077] Use a heat gun to remove moisture from the cable cutout at a distance of 30 to 50 cm, and measure the insulation resistance. After the cable insulation treatment is qualified, seal the glass powder on the sealing joint 21 can and heat the glass powder by high-frequency heating. After the glass powder is melted, slowly cool and solidify. Repeat this 3 to 4 times until the molten and solidified glass powder completely fills the sealing joint 21.

[0078] After sealing is completed, grind the joint, immerse it in water for 1 hour, and measure the insulation resistance at room temperature and high temperature above 300℃.

[0079] Specific multiple embodiments and experimental data are as follows:

[0080]

[0081] It can be seen from the data in the table that, under the condition of 600°C, the high temperature resistance and insulation effects of the cables in Examples 1, 2 and 3 of the present application still meet the requirements, while the high temperature resistance of the commercially available PI cables and PEEK cables is not as good as that of Examples 1, 2 and 3 of the present application. At the same time, the outer diameter of the cable of the present application can be below 3.0 mm, meeting the required flexibility requirements and facilitating wiring operations.

[0082] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A high temperature resistant coaxial insulated signal cable, comprising a signal cable (1), characterized in that: The signal cable (1) comprises: Signal line; A signal layer, arranged outside the signal line and concentric with the signal line; an insulating layer, wrapped around the signal line and the outer peripheral wall of the signal layer; and An outer sheath (15) wrapped around the outermost insulating layer; The signal line, the signal layer and the insulating layer therebetween form an inner core cable, the inner core cable, the outer sheath (15) and the insulating layer therebetween form a coaxial cable, and both the inner core cable and the coaxial cable are processed by alternating drawing and annealing to form a signal cable (1) with an outer diameter less than 3.0 mm.

2. The high temperature resistant coaxial insulated signal cable according to claim 1, characterized in that: At least one end of the signal cable (1) is provided with a sealing member (2), and the sealing member (2) is used to seal the end of the signal cable (1).

3. The high temperature resistant coaxial insulated signal cable according to claim 2, characterized in that: The sealing member (2) comprises a sealing joint (21) with an open space and a second terminal (24), one end of the second terminal (24) being pressed against the end of the signal cable (1), and the pressing area being located in the open space of the sealing joint (21), and the other end of the second terminal (24) extending out of the open space of the sealing joint (21).

4. The high temperature resistant coaxial insulated signal cable according to claim 3, characterized in that: The signal line extends from the end of the signal cable (1) to the open space of the sealed joint (21) and is provided with a first wiring terminal (23).

5. A cable manufacturing method for manufacturing a high temperature resistant coaxial insulated signal cable as claimed in any one of claims 1 to 4, characterized in that: The manufacturing method comprises the following steps: Step S1: In the inner core cable, the signal layer, the insulation layer and the signal line select a metal tube, an insulation part and a core rod in turn, and the core rod penetrates the insulation part and is assembled on the inner wall of the metal tube; Step S2: alternately drawing and annealing the inner core cable, wherein the elongation of each drawing pass of the inner core cable is 18% to 22%, and the annealing temperature is 550° C. to 650° C., until the outer diameter is 4.0 mm to 4.5 mm, then the drawing is stopped; Step S3: straightening the inner core cable. In the coaxial cable, the outer sheath (15) and the insulating layer are respectively selected from the pipe and the insulating member. The inner core cable passes through the insulating member and is assembled on the inner wall of the pipe. Step S4: The coaxial cable is alternately drawn and annealed, with the elongation of the coaxial cable being 13% to 19% in each pass and the annealing temperature being 950° C. to 1100° C., until the outer diameter of the coaxial cable is 2.0 mm to 3.0 mm, and then the drawing is stopped.

6. The cable manufacturing method according to claim 5, characterized in that: The step S4 further comprises: When the outer diameter of the coaxial cable is greater than 4.0 mm, the coaxial cable is annealed once for each drawing pass; when the outer diameter of the coaxial cable is less than 4.0 mm, the coaxial cable is annealed once for each two drawing passes.

7. The cable manufacturing method according to claim 5, characterized in that: In step S4, the coaxial cable is annealed at a speed of 0.4 to 2.2 m / mim.

8. The cable manufacturing method according to claim 5, characterized in that: The end of the coaxial cable is filled with a sealing material (22), and the sealing material melts and solidifies the end of the coaxial cable.

9. The cable manufacturing method according to claim 8, characterized in that: The sealing material (22) is glass powder.

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