JPH0590741U - Heat resistant wire - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a heat-resistant electric wire which can be stably used at a temperature of 200 ° C or higher, has good flexibility, and can easily manufacture long products. [Structure] On the conductor 2, perfluoroalkoxy resin (PFA) or fluorinated ethylene propylene resin (FEP)
A plurality of insulating cores 1 provided with an insulator 3 made of fluorocarbon resin are twisted together, and a protective coating 5 made of a braid of Tyranno fiber yarn or poly (p-phenylene terephthalamide) fiber yarn is provided thereon. .

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a heat resistant electric wire in which an insulator made of fluororesin is provided on a conductor.

[0002]

[Prior Art]

 Conventionally, in applications where high heat resistance is required, such as lead wires, the insulator is made of silicone rubber and the protective coating is made of silicone rubber or glass braid, and the insulator is made of perfluoroalkoxy resin (PFA) or It is generally used that a fluororesin such as a fluorinated ethylene propylene resin (FEP) is used, and a protective coating is a glass braid impregnated with a silicone varnish.

Under these circumstances, there is a recent need for heat resistant electric wires that can be stably used at temperatures of 200 ° C. or higher.

However, the conventional silicone rubber-insulated product can withstand continuous use up to a maximum temperature of 180 ° C, and the fluororesin-insulated product has a higher heat resistance than the fluororesin itself. Although the temperature is high (for example, the maximum continuous use temperature of PFA is 250 ° C, FEP is 200 ° C), the heat resistance temperature of the silicone varnish impregnated to prevent fluffing of the glass braid is 180 ° C, so it can be used as an electric wire. The usable temperature was up to 180 ° C.

In addition, a heat resistant electric wire using PFA or FEP, which is the same as the insulator, for the protective coating instead of the silicone varnish impregnated glass braid is also known, but it is poor in flexibility and can be used for manufacturing long products. Since it is difficult, there is a problem that the application is limited.

[0006]

[Problems to be solved by the device]

 As described above, there is a demand for heat-resistant wires that can be used stably at temperatures of 200 ° C or higher, but conventional heat-resistant wires cannot be used at temperatures above 180 ° C, or they are poor in flexibility, and However, in reality, it is difficult to manufacture a long product, and it has not been possible to meet the above requirements.

The present invention has been made in order to meet such a requirement, and a heat-resistant electric wire which can be stably used at a temperature of 200 ° C. or higher, has good flexibility, and can easily manufacture a long product. The purpose is to provide.

[0008]

[Means for Solving the Problems]

 The heat-resistant electric wire of the present invention is characterized in that the outer circumference of the cable core is formed of an insulating core formed by providing an insulator made of fluororesin on the conductor, and a protective coating made of a braid of heat-resistant and high-strength fiber yarn is applied. To do.

[0009]

[Action]

 The heat-resistant wire of the present invention is insulated with a fluororesin, and the protective coating is composed of a braid of heat-resistant and high-strength fiber thread that does not need to be impregnated with silicone varnish like conventional glass fiber, The flexibility is improved and the flexibility is good. It is also easy to manufacture.

[0010]

【Example】

 Next, an embodiment of the present invention shown in the drawings will be described. In the following drawings, common parts are designated by the same reference numerals.

FIG. 1 is a cross-sectional view showing a heat resistant electric wire according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes an insulated wire core in which an insulator 3 made of fluororesin is provided on a conductor 2, and a plurality of the insulated wire cores 1 are twisted to form an insulated wire core group 4. is doing. A protective coating 5 made of a braid of heat-resistant and high-strength fiber yarns, which will be described later, is provided on the insulating core group 4.

Here, as the conductor 2, a Ni wire or an Ag wire having good heat resistance, or a copper wire plated with these Ni or Ag is used.

Further, as the fluororesin constituting the insulator 3, it is preferable to use a perfluoroalkoxy resin (PFA) or a fluorinated ethylene propylene resin (FE P) from the viewpoint of heat resistance and easy coating. That is, the maximum continuous use temperature of PFA is 250 ° C. and FEP is 200 ° C. as described above, and both can be extruded. By directly extruding PFA or FEP onto the conductor 2, the PFA tape is also used. By winding the or FEP tape, the insulator 3 having a desired thickness can be easily formed.

Further, as the heat-resistant and high-strength fiber constituting the protective coating 5, a fiber made of an organometallic polymer, for example, Tyranno fiber (trade name) manufactured by Ube Industries, Ltd. or Kevlar (trade name) manufactured by DuPont is used. The use of known poly (p-phenylene terephthalamide) fibers is preferred.

[0016] Tyranno fibers have a tensile strength of 300 kg / mm ² approximately, tensile modulus 18000kg / mm ² approximately, the continuously usable temperature 1000 ° C. or higher, the strength, elastic modulus, excellent fiber heat resistance, and resistance to It also has excellent weatherability and chemical resistance.

Poly (p-phenylene terephthalamide) fiber is also known as a fiber having high strength and high elastic modulus, and although heat resistance is inferior to that of the above Tyranno fiber, the temperature at which continuous use is possible is a fluororesin. It has excellent heat resistance of over 200 ℃, which is comparable to

In the heat-resistant electric wire thus configured, the protective coating 5 made of a braid of heat-resistant and high-strength fiber yarn having good heat resistance and high mechanical strength is provided on the insulator 3 made of fluororesin. Therefore, it is possible to improve the heat resistance as compared with the conventional one in which the protective coating 5 is made of a glass braid treated with a silicone varnish, and the flexibility is good. Can also be easily manufactured.

By the way, in the heat-resistant electric wire having the above-mentioned structure in which the protective coating 5 is made of the braid of the above-mentioned Tyranno fiber yarn and the insulator is made of PFA, it is possible to continuously use it at 250 to 260 ° C. The heat-resistant wire made of poly (p-phenylene terephthalamide) fiber and having the above-mentioned structure of PFA as the insulator could be continuously used up to about 200 ° C.

The above embodiment is an example of a heat resistant electric wire having a multi-core structure in which a plurality of insulated wire cores 1 are twisted, but the present invention is not limited to such an embodiment, and FIG. It can also be applied to a single-core structure as shown in. Further, as shown in FIG. 3, the insulating core 1 is twisted together with an interposer 6 such as Tyranno fiber or poly (p-phenylene terephthalamide) fiber, on which a protective coating made of a braid of heat resistant and high strength fiber yarn is formed. 5 may be provided. In any case, it is possible to obtain the same effect as that of the above embodiment.

[0021]

[Effect of the device]

 As described above, the heat-resistant wire of the present invention is made of a fluororesin insulator and a protective coating made of a braid of heat-resistant and high-strength fiber yarns. It also has excellent flexibility. Further, even a long product can be easily manufactured. Therefore, it can be widely used for various applications including the lead wire as a heat resistant electric wire replacing the conventional fluororesin insulated wire.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a heat resistant electric wire of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the heat resistant electric wire of the present invention.

FIG. 3 is a cross-sectional view showing still another embodiment of the heat resistant electric wire of the present invention.

[Explanation of symbols]

 1 ... Insulated wire core 2 Conductor 3 Fluorine resin insulator 4 Insulation wire core group 5 Protective coating made of braided heat resistant high strength fiber yarn

Claims (1)

[Scope of utility model registration request] 1. A heat-resistant electric wire, characterized in that a protective coating made of a braid of heat-resistant and high-strength fiber yarn is applied to the outer circumference of an insulated wire core in which an insulator made of fluororesin is provided on a conductor.