A type of bend-resistant temperature measuring cable

Abstract

This utility model relates to a bending-resistant temperature-sensing cable in the field of cable technology. It includes a cable core and a wrapping tape, an inner sheath, an armor layer, and an outer sheath sequentially wrapped around the cable core. The cable core is composed of several conductors, with a filler layer between the conductors and the cable core. A temperature-sensing optical fiber connected to the outside is located within the filler layer. A shape memory metal layer is located between the wrapping tape and the inner sheath. This utility model uses the externally connected temperature-sensing optical fiber to monitor changes in the cable's internal temperature in real time, thereby providing timely warnings of abnormal temperatures and ensuring the cable's safe operation. Furthermore, the elastic deformation recovery properties of the shape memory metal layer enhance the cable's bending resistance, preventing excessive bending of the cable core due to gravity or other factors that could damage the internal structure and effectively extend the cable's service life.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a bending-resistant temperature measuring cable. Background Technology

[0002] Cables are an indispensable transmission medium in modern electronic equipment, widely used in various electrical appliances and communication systems. Existing cables include various types such as fire-resistant cables, deep-sea cables, and temperature-sensing cables. Temperature-sensing cables, in particular, use temperature-sensing elements to monitor cable temperature changes in real time and feed the signal back to the control system, enabling early warning and protection against abnormal temperatures.

[0003] Furthermore, existing temperature measuring cables lack a bending-resistant structure, requiring numerous support points during installation to prevent excessive bending of the cable core due to gravity or other factors. This bending could damage the internal temperature sensing element or interrupt signal transmission, affecting temperature measurement accuracy and cable lifespan. Therefore, this invention provides a bending-resistant temperature measuring cable. Summary of the Invention

[0004] This invention provides a bending-resistant temperature measuring cable. By using a shape memory metal layer to enhance the bending resistance of the cable, it solves the problem that existing temperature measuring cables are prone to damage to the temperature sensing element and signal interruption due to the lack of a bending-resistant structure.

[0005] The objective of this utility model is achieved through the following means:

[0006] A bend-resistant temperature measuring cable includes a cable core and a wrapping tape, an inner sheath, an armor layer, and an outer sheath sequentially wrapped around the outside of the cable core. The cable core is composed of several conductors, and a filling layer is provided between the conductors and the cable core. A temperature-sensing optical fiber connected to the outside is provided in the filling layer. A memory metal layer is provided between the wrapping tape and the inner sheath.

[0007] Furthermore, the memory metal layer is composed of memory metal wires, which are spirally wound around the outer side of the wrapping tape.

[0008] Furthermore, a temperature-sensing warning layer is provided on the outer side of the outer sheath.

[0009] Furthermore, a protective sleeve is provided on the outer side of the temperature-sensing warning layer.

[0010] Furthermore, the protective sleeve has a mesh structure or a spiral structure.

[0011] Furthermore, the wire includes a conductive core and a conductor shielding layer, an insulating layer, and a metal shielding layer sequentially wrapped around the outside of the conductive core.

[0012] Furthermore, the conductive core is composed of several strands of conductive metal wires twisted together.

[0013] The beneficial effects of this invention are as follows: By connecting to an external temperature-sensing optical fiber, the internal temperature changes of the cable can be monitored in real time, thereby providing timely warnings of abnormal temperatures and ensuring the safe use of the cable. Furthermore, the elastic deformation recovery properties of the shape memory metal layer enhance the cable's bending resistance, preventing excessive bending of the cable core due to gravity or other factors that could damage the internal structure and effectively extend the cable's service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a bend-resistant temperature measuring cable according to the present invention;

[0015] Figure 2 for Figure 1 Enlarged diagram of A in the middle;

[0016] Figure 3 This is a cross-sectional view of a bending-resistant temperature measuring cable according to the present invention.

[0017] The labels in the figure are as follows: 1-Cable core, 11-Wire, 111-Conductive core, 112-Conductor shielding layer, 113-Insulation layer, 114-Metallic shielding layer, 2-Wrapping tape, 3-Inner sheath, 4-Armor layer, 5-Outer sheath, 6-Filling layer, 61-Temperature-sensing optical fiber, 7-Memory metal layer, 71-Memory metal wire, 8-Temperature-sensing warning layer, 9-Protective sleeve. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] In this embodiment, refer to Figure 1 - Figure 3 The specific implementation of the bending-resistant temperature measuring cable includes a cable core 1 and a wrapping tape 2, an inner sheath 3, an armor layer 4 and an outer sheath 5 wrapped around the outside of the cable core 1 in sequence. The cable core 1 is composed of several conductors 11. A filling layer 6 is provided between the several conductors 11 and the cable core 1. A temperature-sensing optical fiber 61 connected to the outside is provided in the filling layer 6. A memory metal layer 7 is provided between the wrapping tape 2 and the inner sheath 3.

[0020] The wrapping tape 2 uses high-temperature resistant polyester tape or aramid fiber tape to wrap around the cable core 1 and the filling layer 6, enhancing structural stability and heat resistance. The armor layer 4 uses steel wire armor or aluminum alloy tape armor to improve the cable's mechanical strength and compressive strength, effectively preventing external crushing damage and rodent / insect damage. Both the inner sheath 3 and the outer sheath 5 are made of high-density polyethylene or cross-linked polyethylene, possessing excellent insulation properties and resistance to environmental stress cracking, ensuring long-term stable operation of the cable under complex working conditions.

[0021] In this embodiment, three temperature-sensing optical fibers 61 are provided. The three temperature-sensing optical fibers 61 are evenly distributed around the cable core 1 in the filling layer 6. Each temperature-sensing optical fiber 61 is equidistant from the cable core 1 to ensure the uniformity and accuracy of temperature sensing.

[0022] Three temperature-sensing optical fibers 61 are arranged parallel to each other along the axial direction of the cable core 1, running through the entire length of the cable, and connected to external temperature measuring equipment to transmit signals of temperature changes inside the cable in real time. The temperature measuring equipment includes a laser light source, a photodetector, and a signal processing system.

[0023] In use, a laser pulse is emitted from a laser source onto the temperature-sensing optical fiber 61. As the laser propagates through the fiber, it undergoes Raman scattering with the fiber molecules, generating Stokes light and anti-Stokes light. The intensity of the anti-Stokes light is highly sensitive to temperature changes, while the Stokes light is largely unaffected by temperature.

[0024] After the optical signal is received by the photodetector, the signal processing system calculates the time difference between the emitted laser pulse and the received backscattered light. Combined with the propagation speed of the optical signal in the optical fiber, the scattering point is precisely located. Furthermore, by calculating the intensity ratio of the anti-Stokes light to the Stokes light, the real-time temperature at that location can be accurately calculated. Through continuous acquisition and analysis of optical signals from different locations, real-time monitoring of the entire cable's temperature distribution is achieved. This enables rapid identification and early warning of abnormal cable temperatures, effectively preventing safety accidents caused by localized overheating.

[0025] The shape memory metal layer 7 is composed of shape memory metal wires 71, which are spirally wound around the outer side of the wrapping tape 2. This spiral winding gives the shape memory metal wires 71 a spring-like structure, providing excellent elasticity and bending resistance. Under normal conditions, the shape memory metal wires 71 maintain their preset shape, providing basic stiffness and support for the cable. When bending occurs, the shape memory metal wires 71 undergo a stress-induced phase transition and absorb external bending stress through elastic deformation. When the external force is removed, the shape memory metal wires 71 generate a restoring force through the phase transition, driving the cable to return to its original shape, effectively reducing permanent deformation.

[0026] When the cable reaches the phase transition point of the memory metal due to bending or current overload, the memory metal wire 71 will more forcefully restore its original shape, further enhancing the cable's bending resistance and structural stability.

[0027] The outer sheath 5 is provided with a temperature-sensitive warning layer 8. The temperature-sensitive warning layer 8 is made of rubber or plastic material with temperature-sensitive color-changing properties. It is green at room temperature. When the surface temperature of the cable rises abnormally to a preset threshold, the color of the temperature-sensitive warning layer 8 changes from green to red, so as to realize a direct and visual temperature warning.

[0028] This thermochromic material can be made of reversible or irreversible thermosensitive materials. When a reversible thermosensitive material is used, the warning layer returns to green after the temperature decreases, making it suitable for operating conditions with periodic load changes. When an irreversible thermosensitive material is used, the color change is permanently retained, facilitating post-incident traceability and fault analysis, making it suitable for critical circuits with extremely high safety requirements.

[0029] The warning layer and the temperature-sensing fiber optic cable 61 work together to achieve multi-level temperature monitoring and early warning. When the surface temperature is abnormal, the warning layer immediately displays a visual alert, allowing on-site personnel to quickly identify the risk area. Simultaneously, the temperature-sensing fiber optic cable 61 transmits accurate temperature data to the monitoring system in real time, enabling remote early warning and automatic response. This prevents on-site personnel from overlooking potential hazards due to negligence or obstructed vision, ensuring dual transmission of warning information. Through the combination of material properties and sensing technology, comprehensive perception and intelligent early warning of cable operating status are achieved, improving system safety and operational efficiency.

[0030] A protective sleeve 9 is fitted over the outside of the temperature-sensing warning layer 8. The protective sleeve 9 has a mesh or spiral structure. This mesh or spiral design prevents the temperature-sensing warning layer 8 from being scratched or worn by external forces, while ensuring that its color changes remain clearly visible. The mesh structure also facilitates heat dissipation and air circulation for the cable, preventing heat buildup that could cause false triggering of the warning layer. The outer side of the protective sleeve 9 can also use the same thermochromic coating as the temperature-sensing warning layer 8, working together to provide visual warning and enhance the three-dimensional presentation of the warning effect.

[0031] The conductor 11 includes a conductive core 111 and a conductor shielding layer 112, an insulating layer 113, and a metal shielding layer 114 sequentially wrapped around the outside of the conductive core 111. The conductor shielding layer 112 is made of a semi-conductive material that is at the same potential as the conductive core 111, and it homogenizes the electric field on the surface of the conductive core 111, suppresses partial discharge, and improves insulation reliability.

[0032] The insulation layer 113 is made of insulating rubber or plastic material with flame-retardant and heat-resistant properties, thereby undertaking the main insulation function and ensuring the stable operation of the conductor 11 under high temperature and high pressure environment.

[0033] The metal shielding layer 114 is constructed from braided or wound soft copper strips or copper wire mesh. This layer provides electromagnetic shielding and grounding protection for the cable, offering a stable zero-potential surface and ensuring the stability of the electric field distribution. Furthermore, the metal shielding layer 114 also shields the internal electric field, preventing external electromagnetic interference and resisting the influence of external electromagnetic interference on the cable's internal electric field. This enhances the cable's operational stability and safety in complex electromagnetic environments.

[0034] The conductive core 111 is composed of several stranded conductive metal wires. The stranding process gives the conductive core 111 greater flexibility and fatigue resistance, making it easier to lay in environments with frequent bending and vibration, and effectively preventing core breakage due to mechanical stress concentration. Furthermore, the stranded structure increases the effective conductive area of ​​the conductive core 111, reduces resistive heating, and further improves current carrying capacity and energy efficiency. This enhances the operational reliability of the conductive core 111 under high loads and complex operating conditions.

[0035] The beneficial effects of this invention are as follows: By connecting to an external temperature-sensing optical fiber 61, the internal temperature changes of the cable can be monitored in real time, thus providing timely warnings of abnormal temperatures and ensuring the safe use of the cable. Furthermore, the elastic deformation recovery characteristics of the shape memory metal layer 7 enhance the cable's bending resistance, preventing excessive bending of the cable core 1 due to gravity or other factors that could damage the internal structure and effectively extend the cable's service life.

[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A bending-resistant temperature measuring cable, comprising a cable core (1) and a wrapping tape (2), an inner sheath (3), an armor layer (4), and an outer sheath (5) sequentially wrapped around the outside of the cable core (1), characterized in that: The cable core (1) is composed of several conductors (11), and a filling layer (6) is provided between the several conductors (11) and the cable core (1). A temperature-sensing optical fiber (61) connected to the outside is provided in the filling layer (6), and a memory metal layer (7) is provided between the wrapping tape (2) and the inner sheath (3).

2. The bend-resistant temperature measuring cable according to claim 1, characterized in that: The memory metal layer (7) is composed of memory metal wires (71), which are spirally wound around the outer side of the wrapping tape (2).

3. The bend-resistant temperature measuring cable according to claim 1, characterized in that: The outer sheath (5) is provided with a temperature-sensing warning layer (8) on its outer side.

4. The bend-resistant temperature measuring cable according to claim 3, characterized in that: The outer side of the temperature-sensing warning layer (8) is covered with a protective sleeve (9).

5. The bend-resistant temperature measuring cable according to claim 4, characterized in that: The protective sleeve (9) has a mesh structure or a spiral structure.

6. The bend-resistant temperature measuring cable according to claim 1, characterized in that: The conductor (11) includes a conductive core (111) and a conductor shielding layer (112), an insulating layer (113) and a metal shielding layer (114) sequentially wrapped around the outside of the conductive core (111).

7. The bend-resistant temperature measuring cable according to claim 6, characterized in that: The conductive core (111) is composed of several strands of conductive metal wires twisted together.

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