Temperature measurement cable

Abstract

This utility model discloses a temperature-measuring cable, relating to the field of cable technology. The temperature-measuring cable includes a cable core, a temperature-measuring optical fiber, and a sheath. The cable core has a first end and a second end at its two ends along its extension direction, extending in a straight line from the first end to the second end. The temperature-measuring optical fiber is attached to the outside of the cable core to monitor its temperature. The temperature-measuring optical fiber extends in a curved line from the first end to the second end, such that its extension length from the first end to the second end is greater than the extension length of the cable core from the first end to the second end. A reinforcing layer is also wrapped around the temperature-measuring optical fiber. The sheath is filled with a filling layer that covers the cable core and the temperature-measuring optical fiber, and the sheath covers the filling layer. In this utility model, the temperature-measuring optical fiber can be pulled out to both sides, which not only facilitates the connection of both ends of the temperature-measuring optical fiber to external structures, but also improves its practicality. Furthermore, the reinforcing layer surrounding the temperature-measuring optical fiber enhances its tensile strength, resulting in better reliability.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to a temperature measuring cable. Background Technology

[0002] With surging electricity demand, cables, as the "blood vessels" of energy transmission, are directly related to power grid stability, industrial production, and public safety. However, abnormal heating generated during long-term load operation of cables has become a core hidden danger causing fires, short circuits, and even explosions. Currently available temperature-sensing cables can monitor the temperature of the cable core through their internal temperature-sensing optical fibers. However, the limited length of these fibers restricts subsequent installation and laying. If the fiber is too short, the end of the fiber may not be able to connect to other external structures; if the fiber is too long, there is a risk of leakage, resulting in poor reliability. Utility Model Content

[0003] The main purpose of this utility model is to propose a temperature measuring cable, which aims to solve the technical problem of poor reliability of existing temperature measuring cables.

[0004] To achieve the above objectives, this utility model proposes a temperature measuring cable, which includes:

[0005] The cable core has two ends along its extension direction, namely the first end and the second end, and the cable core extends in a straight line from the first end to the second end.

[0006] The temperature-sensing optical fiber is attached to the outside of the cable core to monitor the temperature of the cable core. The temperature-sensing optical fiber extends in a curve from the first end to the second end so that the extension length of the temperature-sensing optical fiber from the first end to the second end is greater than the extension length of the cable core from the first end to the second end. The temperature-sensing optical fiber is also covered with a reinforcing layer.

[0007] The sheath contains a filling layer that covers the cable core and the temperature-sensing optical fiber, and the sheath covers the filling layer.

[0008] In one embodiment, the temperature-sensing optical fiber extends from the first end in a wavy line to the second end, and the temperature-sensing optical fiber is continuously attached to the outside of the cable core.

[0009] In one embodiment, the cable core includes a plurality of stranded cores, each core including a conductor and a conductor shielding layer, an insulation layer and an insulation shielding layer sequentially covering the conductor from the inside out; the conductor shielding layer and the insulation shielding layer are both semi-conductive shielding layers, and the insulation layer is a cross-linked polyethylene insulation layer.

[0010] In one embodiment, each conductor is further covered with a metal shielding layer outside the insulating shielding layer. The metal shielding layer is a copper strip, which is spirally wrapped around the insulating shielding layer from the first end to the second end.

[0011] In one embodiment, the reinforcing layer is a metal wire braided layer or an aramid braided layer.

[0012] In one embodiment, the filler layer is formed of polypropylene mesh filler rope.

[0013] In one embodiment, a wrapping tape for securing the filling layer, cable core, and temperature-sensing optical fiber is wrapped around the outside of the filling layer, and a sheath is extruded over the wrapping tape.

[0014] In one embodiment, the wrapping tape is a non-woven fabric or fiberglass tape, and the wrapping tape is wrapped around the outside of the filling layer with gaps.

[0015] In one embodiment, the sheath includes an isolation layer, an armor layer, and a protective layer. The isolation layer is extruded onto the outside of the sheath, the armor layer is wrapped around the outside of the isolation layer, and the protective layer is tightly bonded to the outside of the armor layer through an extrusion process.

[0016] In one embodiment, the armor layer is a double-layer steel strip armor layer, and the protective layer is a polyvinyl chloride flame-retardant layer.

[0017] This utility model discloses a temperature-measuring cable, comprising a cable core, a temperature-measuring optical fiber, and a sheath. The cable core extends in a straight line from one end to the other. Therefore, for any segment of the temperature-measuring cable, the actual length of the cable core is the same as the actual length of the entire temperature-measuring cable. The temperature-measuring optical fiber extends in a curved line from one end to the other. Understandably, for any segment of the temperature-measuring cable, the actual extension length of the optical fiber is greater than the actual length of the entire temperature-measuring cable. During the actual installation and laying of the temperature-measuring cable, the two ends of the temperature-measuring optical fiber can be pulled outwards by a suitable distance according to actual installation requirements. This not only facilitates the connection of the two ends of the temperature-measuring optical fiber to external structures, such as connecting external measuring instruments, but also avoids leakage due to excessive length of the temperature-measuring optical fiber, resulting in good safety and reliability.

[0018] Furthermore, by covering the temperature-sensing fiber with a reinforcing layer, the tensile strength of the temperature-sensing fiber is further improved, preventing it from breaking when pulled, thus improving reliability.

[0019] In addition, by setting up a sheath, the cable core and the temperature measuring optical fiber are protected, and a filler layer is filled inside the sheath. The filler layer can make the cable core and the temperature measuring optical fiber fit together better, thereby improving the temperature measurement accuracy of the temperature measuring optical fiber. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a temperature measuring cable provided in an embodiment of the present invention;

[0022] Figure 2 This is a partial structural schematic diagram of a temperature measuring cable provided in an embodiment of the present invention.

[0023] Explanation of icon numbers:

[0024] 100. Temperature measuring cable; 1. Core; 11. Conductor; 12. Conductor shielding layer; 13. Insulation layer; 14. Insulation shielding layer; 15. Metal shielding layer; 2. Temperature measuring optical fiber; 21. Reinforcing layer; 3. Filling layer; 4. Wrapping tape; 5. Sheath; 51. Isolation layer; 52. Armoring layer; 53. Protective layer.

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] This utility model proposes a temperature measuring cable 100.

[0030] Please see Figure 1 and Figure 2 In one embodiment of this utility model, the temperature measuring cable 100 includes a cable core, a temperature measuring optical fiber 2, and a sheath 5; the two ends of the cable core along its extension direction are a first end and a second end, respectively, and the cable core extends in a straight line from the first end to the second end; the temperature measuring optical fiber 2 is attached to the outside of the cable core for monitoring the temperature of the cable core; and the temperature measuring optical fiber 2 extends in a curve from the first end to the second end, so that the extension length of the temperature measuring optical fiber 2 from the first end to the second end is greater than the extension length of the cable core from the first end to the second end, and a reinforcing layer 21 is also covered outside the temperature measuring optical fiber 2; the sheath 5 is also filled with a filling layer 3 that covers the cable core and the temperature measuring optical fiber 2, and the sheath 5 covers the filling layer 3.

[0031] The temperature measuring cable 100 of this utility model includes a cable core, a temperature measuring optical fiber 2, and a sheath 5. The cable core extends in a straight line from the first end to the second end. Therefore, for any segment of the temperature measuring cable 100, the actual length of the cable core is the actual length of the entire temperature measuring cable 100. The temperature measuring optical fiber 2 extends in a curved line from the first end to the second end. It can be understood that for any segment of the temperature measuring cable 100, the actual extension length of the temperature measuring optical fiber 2 is greater than the actual length of the entire temperature measuring cable 100. During the actual installation and laying of the temperature measuring cable 100, the two ends of the temperature measuring optical fiber 2 can be pulled outwards by a suitable distance according to the actual installation requirements. This not only facilitates the connection of the two ends of the temperature measuring optical fiber 2 to external structures, such as connecting external measuring instruments, but also avoids leakage due to excessive length of the temperature measuring optical fiber 2, thus improving its practicality.

[0032] Furthermore, by covering the temperature-sensing optical fiber 2 with a reinforcing layer 21, the tensile strength of the temperature-sensing optical fiber 2 is further improved, preventing it from breaking when pulled, thus improving reliability.

[0033] In addition, by setting the sheath 5, the cable core and the temperature measuring fiber 2 are protected, preventing the cable core and the temperature measuring fiber 2 from being interfered with by the external environment, and the adaptability is better; and the sheath 5 is filled with a filling layer 3, which makes the cable core and the temperature measuring fiber 2 fit more closely and improves the temperature measuring accuracy of the temperature measuring fiber 2.

[0034] Furthermore, the temperature-sensing optical fiber 2 extends from the first end in a wavy line to the second end, and the temperature-sensing optical fiber 2 is continuously attached to the outside of the cable core. By arranging the temperature-sensing optical fiber 2 in a wavy line, the length of the temperature-sensing optical fiber 2 housed inside the cable is longer, and the temperature-sensing optical fiber 2 is continuously attached to the cable core, that is, always attached to the outside of the cable core, so as to improve the temperature measurement accuracy of the temperature-sensing optical fiber 2.

[0035] It should be noted that the wavy line can be either uniform or non-uniform. A uniform wavy line can be understood as having a consistent amplitude of up and down bending, so that for a section of temperature measuring cable 100 of equal length cut at different positions, the actual extension length of the temperature measuring optical fiber 2 is equal. A non-uniform wavy line can be that the temperature measuring optical fiber 2 is bent arbitrarily and accommodated within the sheath 5, with different degrees of bending at different positions, so that for a section of temperature measuring cable 100 of equal length cut at different positions, the actual extension length of the temperature measuring optical fiber 2 can be different.

[0036] In one embodiment, the temperature-sensing optical fiber 2 may be partially straight and partially curved; or, the temperature-sensing optical fiber 2 may be arranged with alternating straight and curved sections, i.e., alternating between straight and curved sections. This can save on the cost of the temperature-sensing optical fiber 2 and also allow the extension length of the temperature-sensing optical fiber 2 to be greater than the extension length of the cable core, so that both ends of the temperature-sensing optical fiber 2 can be stretched to both sides.

[0037] Furthermore, the cable core includes multiple stranded cores 1, each core 1 including a conductor 11 and a conductor shielding layer 12, an insulation layer 13 and an insulation shielding layer 14 that are sequentially wrapped around the conductor 11 from the inside out; the conductor shielding layer 12 and the insulation shielding layer 14 are both semi-conductive shielding layers, and the insulation layer 13 is a cross-linked polyethylene insulation layer 13.

[0038] Understandably, the cable core is composed of multiple twisted cores 1, each core 1 including a conductor 11, a conductor shielding layer 12, an insulation layer 13, and an insulation shielding layer 14; wherein the conductor 11 is formed by twisting multiple strands of copper wire, resulting in an uneven surface of the conductor 11. By setting the conductor shielding layer 12, the conductor shielding layer 12 is at the same potential as the conductor 11 and has good contact with the insulation layer 13, thereby preventing partial discharge between the conductor 11 and the insulation layer 13; by setting the insulation shielding layer 14, the insulation shielding layer 14 has good contact with the outer surface of the insulation layer 13, and the insulation shielding layer 14 is at the same potential as the sheath 5, thereby preventing partial discharge between the insulation layer 13 and the sheath 5.

[0039] The conductor shielding layer 12 and the insulating shielding layer 14 are both made of semi-conductive materials, such as cross-linked polyethylene and polypropylene.

[0040] In one specific embodiment, the conductor shielding layer 12, the insulating layer 13, and the insulating shielding layer 14 are co-extruded, and the conductor shielding layer 12, the insulating layer 13, and the insulating shielding layer 14 are made of the same material.

[0041] Furthermore, in each conductor 1, an insulating shielding layer 14 is further covered by a metal shielding layer 15. The metal shielding layer 15 is a copper strip, which is spirally wrapped around the insulating shielding layer 15 from the first end to the second end. By covering the insulating shielding layer 14 with a metal shielding layer 15, when the cable is energized, the metal shielding layer 15 carries a capacitive current. Since the conductor 11 is wrapped inside the metal shielding layer 15, the electromagnetic field caused by the conductor 11 being energized is shielded, reducing electromagnetic interference to the outside world. At the same time, the metal shielding layer 15 can also prevent external electromagnetic fields from affecting the conductor 1.

[0042] In one embodiment, the reinforcing layer 21 is a metal wire braided layer or an aramid braided layer. Understandably, the reinforcing layer 21 is made of metal wire or aramid braided from one end of the temperature-sensing optical fiber 2 to the other end, which greatly enhances the tensile strength of the temperature-sensing optical fiber 2 and prevents the temperature-sensing optical fiber 2 from being pulled and broken. Both metal wire and aramid have high strength and high temperature resistance.

[0043] In one embodiment, the filling layer 3 is formed of polypropylene mesh filling rope. By using polypropylene mesh filling rope to form the filling layer 3, it has good heat shrinkage properties, is lightweight, and has good insulation properties; it can effectively stabilize the temperature measuring optical fiber 2 and the cable core, and improve the accuracy of temperature measurement.

[0044] Furthermore, a wrapping tape 4 is provided around the outside of the filling layer 3 to secure the filling layer 3, the cable core, and the temperature-sensing optical fiber 2, and the sheath 5 is extruded over the wrapping tape 4. By wrapping the filling layer 3 with the wrapping tape 4, the filling layer 3, the cable core, and the temperature-sensing optical fiber 2 are secured, ensuring that the temperature-sensing optical fiber 2 is always in close contact with the outer surface of the cable core, thereby improving the accuracy of temperature measurement.

[0045] In one embodiment, the wrapping tape 4 is made of non-woven fabric or fiberglass tape, and is wrapped around the outside of the filling layer 3 with gaps. By using non-woven fabric or fiberglass tape as the wrapping tape 4, not only is the material lightweight, which is beneficial for cable weight reduction, but the gaps between the front and back spirals of the wrapping tape 4 also allow for tight binding of the filling layer 3, the cable core, and the temperature-sensing optical fiber 2, while also reducing the cost of using the wrapping tape 4.

[0046] In one embodiment, the sheath 5 includes an isolation layer 51, an armor layer 52, and a protective layer 53. The isolation layer 51 is extruded onto the outside of the strap 4, the armor layer 52 is intermittently wrapped around the outside of the isolation layer 51, and the protective layer 53 is tightly attached to the outside of the armor layer 52 by an extrusion process.

[0047] Understandably, by setting an isolation layer 51, which is located between the armor layer 52 and the core 1, it can be used to prevent the metal shielding layer 15 of the core 1 from being corroded, or to prevent the core and temperature measuring optical fiber 2 from being damaged by the armor layer 52 when the cable is bent. By setting the armor layer 52, the impact of external mechanical force on the cable is reduced. And by setting the protective layer 53, it can be used for waterproofing, corrosion prevention, flame retardancy, and protection against mechanical damage to the core and temperature measuring optical fiber, ensuring the safety and reliability of the temperature measuring cable 100 in various environments.

[0048] Furthermore, the armor layer 52 is a double-layer steel strip armor layer 52, and the protective layer 53 is a polyvinyl chloride flame-retardant layer. Understandably, the armor layer 52 uses double-layer steel strips, which has higher strength, better stability, and better protection; the protective layer 53 uses polyvinyl chloride, which has advantages such as flame retardancy and corrosion resistance, and has high mechanical strength and is not easily damaged.

[0049] The above content is merely an exemplary embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural transformations made using the contents of this utility model specification and drawings under the technical concept of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A temperature measuring cable, characterized in that, The temperature measuring cable includes: The cable core has a first end and a second end at its two ends along its extension direction, and the cable core extends in a straight line from the first end to the second end. A temperature-sensing optical fiber is attached to the outside of the cable core for monitoring the temperature of the cable core; and the temperature-sensing optical fiber extends in a curve from the first end to the second end, such that the extension length of the temperature-sensing optical fiber from the first end to the second end is greater than the extension length of the cable core from the first end to the second end, and the temperature-sensing optical fiber is also covered with a reinforcing layer. The sheath contains a filling layer that covers the cable core and the temperature-sensing optical fiber, and the sheath covers the filling layer.

2. The temperature measuring cable as described in claim 1, characterized in that, The temperature-sensing optical fiber extends from the first end in a wavy line to the second end, and the temperature-sensing optical fiber is continuously attached to the outside of the cable core.

3. The temperature measuring cable as described in claim 1, characterized in that, The cable core includes multiple stranded cores, each core including a conductor and a conductor shielding layer, an insulation layer, and an insulation shielding layer that are sequentially wrapped around the conductor from the inside out; the conductor shielding layer and the insulation shielding layer are both semi-conductive shielding layers, and the insulation layer is a cross-linked polyethylene insulation layer.

4. The temperature measuring cable as described in claim 3, characterized in that, In each of the aforementioned wire cores, an insulating shielding layer is further covered by a metal shielding layer, which is a copper strip. The copper strip is spirally wrapped around the insulating shielding layer from the first end to the second end.

5. The temperature measuring cable as described in claim 1, characterized in that, The reinforcing layer is a metal wire braided layer or an aramid braided layer.

6. The temperature measuring cable as described in any one of claims 1 to 5, characterized in that, The filling layer is formed of polypropylene mesh filling rope.

7. The temperature measuring cable as described in any one of claims 1 to 5, characterized in that, The filling layer is wrapped with a strap to secure the filling layer, the cable core, and the temperature-sensing optical fiber, and the sheath is squeezed over the strap.

8. The temperature measuring cable as described in claim 7, characterized in that, The wrapping tape is made of non-woven fabric or fiberglass tape, and the wrapping tape is wrapped around the outside of the filling layer with gaps.

9. The temperature measuring cable as described in claim 7, characterized in that, The sheath includes an isolation layer, an armor layer, and a protective layer. The isolation layer is extruded onto the outside of the sheath, the armor layer is wrapped around the outside of the isolation layer, and the protective layer is tightly bonded to the outside of the armor layer through an extrusion process.

10. The temperature measuring cable as described in claim 9, characterized in that, The armor layer is a double-layer steel strip armor layer, and the protective layer is a polyvinyl chloride flame-retardant layer.

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