Flame-retardant fireproof temperature-sensing optical cable

Abstract

The utility model relates to the technical field of optical cables, in particular to a flame-retardant fireproof temperature-sensing optical cable which comprises a flame-retardant outer sheath, a steel wire stranded armor is arranged in the flame-retardant outer sheath, the steel wire stranded armor is formed by spirally winding and stranding a plurality of steel wires, a cavity is formed in the middle of the steel wire stranded armor, and a temperature-sensing optical fiber is arranged in the cavity in a penetrating mode. The fireproof temperature-sensing optical cable is simple in structure, and has the advantages of fireproof and fire-resistant performance of the optical cable and heat-conducting performance of the temperature-sensing optical cable.

Description

Technical Field

[0001] This application relates to the technical field of optical cables, and more specifically, to a flame-retardant, fire-resistant, and temperature-sensitive optical cable. Background Technology

[0002] Fire-resistant and temperature-sensing optical cables are special optical cables that integrate fire resistance performance and real-time temperature monitoring functions. They are widely used in high-risk scenarios that are sensitive to fire prevention and temperature.

[0003] Existing fire-resistant and temperature-sensing optical cables have multiple layers of heat-insulating protective materials in their structure to achieve fire resistance. However, while the heat-insulating layer achieves heat insulation and fire resistance, it also isolates the optical fiber from sensing changes in external temperature. This makes the optical fiber unable to sense or quickly sense the external temperature, thus losing its basic function as a temperature-sensing optical cable. Utility Model Content

[0004] To address the problem that existing fire-resistant and heat-sensing optical fibers cannot sense or quickly sense external temperatures, this application provides a flame-retardant and fire-resistant heat-sensing optical cable.

[0005] A flame-retardant and fire-resistant temperature-sensing optical cable includes a flame-retardant outer sheath, inside which is a steel wire stranded armor. The steel wire stranded armor is formed by spirally winding multiple steel wires and forming a cavity in the middle. A temperature-sensing optical fiber is inserted into the cavity. The space between the temperature-sensing optical fiber and the inner wall of the steel wire stranded armor is filled with grease. The flame-retardant outer sheath is an LSZH sheath.

[0006] Preferably, the temperature-sensing optical fiber is a DTS-optimized optical fiber.

[0007] Preferably, the inner wall of the flame-retardant outer sheath is in close contact with the outer surface of the wire stranded armor and fills the gaps between the wires.

[0008] Preferably, the steel wire used in the wire stranded armor is stainless steel wire or galvanized steel wire.

[0009] Preferably, the wire-stranded armor uses five wires twisted together.

[0010] Preferably, the flame-retardant outer sheath is circular and its outer diameter is 3-3.5 mm.

[0011] Preferably, the diameter of the temperature-sensing optical fiber is 0.25 mm.

[0012] The beneficial technical effects of this application are as follows: The LSZH sheath has low smoke, halogen-free, and flame-retardant properties. Using the LSZH sheath as the outer peripheral protection achieves the purpose of flame retardancy, fire resistance, and waterproofing. The inner layer of the outer sheath is set with steel wire stranded armor, grease, and temperature-sensing optical fiber. The structure is simple, the simplified flame-retardant and fire-resistant structure layer is economical, and the overall diameter of the optical cable is small, which facilitates installation and maintenance. Moreover, the heat is conducted by metal and grease, and the heat penetration is fast, which allows the temperature-sensing optical fiber to respond to temperature measurement quickly. Furthermore, the steel wire stranded armor protection gives the optical cable strong tensile and compressive strength, making it less likely for the external environment to damage the temperature-sensing optical fiber and reducing the failure of the temperature-sensing optical fiber. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a flame-retardant and fire-resistant temperature-sensing optical cable according to this embodiment.

[0014] Reference numerals: 1. Flame-retardant outer sheath; 2. Steel wire stranded armor; 3. Cavity; 4. Temperature-sensing optical fiber; 5. Grease. Detailed Implementation

[0015] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0016] Reference Figure 1 A flame-retardant and fire-resistant temperature-sensing optical cable includes a flame-retardant outer sheath 1, which is an LSZH sheath. Inside the flame-retardant outer sheath 1 is a steel wire stranded armor 2. The steel wire stranded armor 2 is formed by spirally winding five steel wires and forming a cavity 3 in the middle. A temperature-sensing optical fiber 4, which is a DTS-optimized optical fiber, is inserted into the cavity 3. The space between the temperature-sensing optical fiber 4 and the inner wall of the steel wire stranded armor 2 is filled with grease. In this structure, the LSZH sheath serves as the flame-retardant outer sheath 1, providing flame-retardant and fire-resistant protection for the outermost layer of the optical cable, thus protecting the temperature-sensing optical fiber 4 from open flame combustion. The steel wire stranded armor 2, formed by the five steel wires, gives the optical cable strong tensile and compressive strength, making it less susceptible to damage from the external environment to the temperature-sensing optical fiber 4, further reducing the likelihood of failure. The simplified structure of the flame-retardant and fire-resistant layer allows for direct and rapid heat conduction to the temperature-sensing fiber 4 via metal and grease, enabling the fiber 4 to respond quickly to temperature measurement. This also simplifies the overall structure of the optical cable, making it easier to install and maintain, and increasing its economic efficiency. The DTS-optimized fiber 4, used as the temperature-sensing fiber 4, enhances the Raman scattering effect and improves temperature sensitivity by doping the fiber core with rare earth elements (such as erbium and ytterbium) or metal ions, resulting in more accurate temperature sensing.

[0017] Reference Figure 1 Furthermore, the inner wall of the flame-retardant outer sheath 1 is tightly attached to the outer surface of the steel wire stranded armor 2 and fills the gaps between the steel wires. This structure involves feeding the formed steel wire stranded armor 2 into an extruder, then extruding the outer sheath material through a die to uniformly wrap the steel wire stranded armor 2. The outer sheath material is then cooled using a cooling device to achieve a tight bond between the flame-retardant outer sheath 1 and the steel wire stranded armor 2. This technology is existing and will not be elaborated upon in this embodiment. The tight bond between the flame-retardant outer sheath 1 and the steel wire stranded armor 2 makes the steel wire stranded armor 2 less prone to dispersion, resulting in strong tensile and compressive protection for the optical cable and making it less susceptible to water penetration. The steel wire used in the steel wire stranded armor 2 is stainless steel wire or galvanized steel wire, preferably galvanized steel wire. Galvanized steel wire has strong corrosion resistance and good flexibility, resulting in a long optical cable life and easy installation.

[0018] Furthermore, the flame-retardant outer sheath 1 is circular with an outer diameter of 3-3.5mm, which is selected as 3mm in this embodiment. The diameter of the temperature-sensing optical fiber 4 is 0.25mm, which makes the overall optical cable small in diameter, making it easy to bend and install or hide it.

[0019] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fire resistant, flame retardant temperature sensing optical cable, characterized by: The application relates to a flame-retardant outer sheath, which is internally provided with a steel wire stranded armor, the steel wire stranded armor is formed by spirally winding and stranding a plurality of steel wires and has a cavity in the middle part, a temperature sensing optical fiber is arranged in the cavity, and the temperature sensing optical fiber is filled with ointment between the inner wall of the steel wire stranded armor, and the flame-retardant outer sheath is an LSZH sheath.

2. A fire resistant, fire survivable temperature sensitive optical cable according to claim 1, wherein: The temperature sensing optical fiber is a DTS optimized optical fiber.

3. A fire resistant, fire survivable temperature sensitive optical cable according to claim 1, wherein: The inner wall of the flame-retardant outer sheath is tightly attached to the outer surface of the steel wire stranded armor and fills the gaps between the steel wires.

4. A fire resistant, fire survivable temperature sensitive optical cable according to claim 1, wherein: The steel wire stranded armor adopts stainless steel wires or galvanized steel wires.

5. A fire resistant, fire survivable temperature sensitive optical cable according to claim 1, wherein: The steel wire stranded armor adopts five steel wires for stranding.

6. A fire resistant, fire survivable temperature sensitive optical cable according to claim 1, wherein: The flame-retardant outer sheath is circular and has an outer diameter of 3-3.5 mm.

7. A fire resistant, fire survivable temperature sensitive optical cable according to claim 1, wherein: The diameter of the temperature sensing optical fiber is 0.25 mm.

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