CN-224205268-U - Buckling-resistant heating wire

Abstract

The utility model provides a buckling-resistant heating wire. The buckling-resistant heating wire has excellent buckling resistance, and can reduce the possibility of breakage even when used in a state of being always bent. The buckling-restrained heating wire comprises a stranded core (11) comprising fiber filaments, a stranded conductor (14) formed by stranding a plurality of metal single wires (12) arranged on the periphery of the stranded core (11), and an insulator (16) arranged on the periphery of the stranded conductor (14), wherein a gap (20) is formed between at least any two metal single wires (12) in the metal single wires (12) forming the stranded conductor (14).

Inventors

• Gang Tian Yangyi
• HUANG PANPAN

Assignees

• 株式会社TOTOKU
• 东特（浙江）有限公司

Dates

Publication Date

20260505

Application Date

20250428

Claims (6)

1. 1. A buckling-resistant heating wire is characterized in that, The buckling-resistant heating wire has: A stranded core comprising fiber filaments; A stranded conductor formed by stranding a plurality of metal single wires provided on the outer periphery of the stranded core, and An insulator provided on the outer periphery of the stranded conductor, At least any two of the metal element wires constituting the stranded conductor are formed with a gap therebetween.
2. 2. The buckling restrained heating wire according to claim 1, wherein, The voids are formed with one or more in the same cross section.
3. 3. The buckling restrained heating wire according to claim 1 or 2, wherein, The void ratio of the voids is 10% or more and 50% or less.
4. 4. The buckling restrained heating wire according to claim 1 or 2, wherein, The outer diameter of each metal element wire is 0.02mm or more and 0.06mm or less.
5. 5. The buckling restrained heating wire according to claim 1 or 2, wherein, The stranding pitch of the stranded conductor is more than 5mm and less than 15 mm.
6. 6. The buckling restrained heating wire according to claim 1 or 2, wherein, The buckling restrained heating wire has an outer diameter of 0.25mm or more and 0.5mm or less.

Description

Buckling-resistant heating wire Technical Field The present utility model relates to a heating wire having buckling durability. Background Conventionally, a structure has been proposed in which a seat belt provided in a vehicle such as an automobile, an airplane, a ship, or the like is heated by a heater wire. For example, patent document 1 (japanese patent application laid-open No. 2017-81510) discloses a structure in which a seat belt is heated by energizing a conductive wire woven into the seat belt. However, patent document 1 does not disclose the structure of the conductive wire itself. Patent document 2 (japanese patent application laid-open No. 2021-068576) discloses an insulated wire used as an automotive wiring, in which a twisted wire formed by twisting a plurality of metal element wires is arranged around a twisted core. If the heater wire is used in a state where the seat belt or the like is always bent, if the buckling resistance is poor, the wire may be broken, and there is a problem that a heater wire excellent in buckling resistance is desired. Disclosure of utility model The present utility model has been made to solve the above-described problems, and an object thereof is to provide a heating wire excellent in buckling resistance, which can reduce the possibility of breakage even when the heating wire is used in a state of being always bent. In order to achieve the above object, the present utility model has the following structure. That is, the buckling-restrained heater wire according to the present utility model is characterized by comprising a twisted core including fiber filaments, a twisted wire conductor formed by twisting a plurality of metal element wires provided on the outer periphery of the twisted core, and an insulator provided on the outer periphery of the twisted wire conductor, wherein a gap is formed between at least any two of the metal element wires constituting the twisted wire conductor. According to this structure, even when the buckling-restrained heating wire is bent, the metal element wires can be prevented from being broken by the gaps between the metal element wires without applying stress to the metal element wires. In addition, it is characterized in that the voids are formed with one or more in the same cross section. The void ratio of the voids is 10% to 50%. If the porosity is less than 10%, there is an increased possibility that stress is applied to the metal element wire when the buckling-restrained heating wire is bent, and if the porosity exceeds 50%, the structure becomes unstable, and it is difficult to maintain the outer diameter accuracy of the buckling-restrained heating wire. Therefore, the void ratio of the voids is preferably 10% or more and 50% or less. Further, each of the metal element wires has an outer diameter of 0.02mm or more and 0.06mm or less. If the outer diameter of the metal element wire is smaller than 0.02mm, the possibility of breakage increases, and if the outer diameter of the metal element wire exceeds 0.06mm, the flexibility decreases. Therefore, the outer diameter of the metal element wire is preferably 0.02mm or more and 0.06mm or less. The stranded conductor has a stranded pitch of 5mm or more and 15mm or less. If the twisting pitch is less than 5mm, the metal element wires are closely arranged with each other, and therefore the void ratio becomes low, and when the buckling-restrained heater wire is bent, the possibility of applying stress to the metal element wires increases, and if the twisting pitch exceeds 15mm, the void ratio becomes too high, the structure becomes unstable, and it is difficult to maintain the outer diameter accuracy of the buckling-restrained heater wire. Therefore, the twisting pitch of the stranded conductor is preferably 5mm or more and 15mm or less. The buckling restrained heating wire has an outer diameter of 0.25mm or more and 0.5mm or less. For example, patent document 2 discloses only an example in which the outer diameter is 1mm or more, and therefore it is difficult to weave a thin material such as a seat belt, but according to this configuration, the material can be used by weaving a seat belt or the like. According to the buckling-resistant heating wire of the present utility model, the possibility of wire breakage can be reduced even when the heating wire is used in a state of being always bent. Drawings Fig. 1 is an explanatory diagram seen from the side to show the structure of the buckling-resistant heater wire according to the present embodiment. Fig. 2 is a cross-sectional view showing the same cross-section of the buckling-resistant heater wire of the present embodiment. Fig. 3 is a cross-sectional view of the same cross-section of a buckling restrained heater wire showing other embodiments. Fig. 4 is a cross-sectional view of the same cross-section of a buckling restrained heater wire showing other embodiments. Fig. 5 is an explanatory view of the buckling durability test apparatu