JPH033933Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Background and purpose of the invention] The invention is a cable suitable for use in places where tensile strength is required, specifically cables installed on buoys installed on the sea and under the sea. The invention relates to cables suitable for use between sonar systems.

For example, when detecting schools of fish in the sea from a ship on the sea, an airplane in the air, or a receiving station on land,
This is done by using a sonar 3 installed underwater as shown in FIG. To explain in more detail, a buoy 1, which has the function of converting the electrical signal from the sonar 3 into radio waves and transmitting them to ships, airplanes, or receiving stations, is floated on the sea surface, and is suspended from the buoy 1 into the sea. A sonar 3 having a function of detecting the presence of schools of fish etc. in the sea is suspended from the lower end of a cable 2 (hereinafter referred to as sonobuoy cable 2). The existence of a school of fish, etc. is detected by the sonar 3, and the received signal is transmitted from the sonar 3 to the buoy 1 via the sonobuoy cable 2, and this buoy 1 is then waiting nearby on the sea, on land, or in the sky. This is done by sending a signal to a receiver.

On the other hand, the buoy 1 and the sonar 3 are initially integrated, and at this time the cable 2 is stored in a bundled state in a storage case provided above the sonar 3. For this reason, the cable 2 is required to have a diameter as small as possible.

Incidentally, when such buoy 1 and sonar 3 are dropped into the sea from a ship or an airplane, the buoy 1 and sonar 3 are automatically separated, and the sonar 3 sinks to an arbitrary position while sequentially pulling out the cable 2. and complete the installation.

By the way, when trying to form multiple electrical lines on a single sonobuoy cable, considering the above points, it is recommended to use a sonobuoy cable made by twisting multiple enamelled wires, which can be made smaller in diameter. It is considered best to adopt

However, with such a sonobuoy cable,
During installation or handling, the enameled wires rub against each other, causing the enamel layer of each enameled wire to wear out, making it impossible to use each enameled wire as a line.

An object of the present invention is to provide a sonobuoy cable that can solve the above-mentioned problems and significantly extend the life of the electric line.

[Summary of the idea]

That is, the gist of the present invention is that it is constructed by mixing and twisting enamelled wires with different hardnesses (wear resistances).

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIG. ) Enameled wire 8 has an enamel layer 7 baked on it, and 8 is an enamel wire 8 on which an enamel layer 10 made of polyurethane resin, etc., which is softer (that is, has lower wear resistance) than the polyamide-imide resin, is baked onto an electrical conductor 9 made of a copper wire. wire, and the enameled wire 5 and the enameled wire 8
They are mixed and twisted so that they are arranged alternately on the cross section. Reference numeral 11 denotes a rubber protective layer formed by extrusion coating on the mixedly twisted enameled wires 5 and 8.

According to the sonobuoy cable having such a configuration, even if the enameled wires 5 and 8 rub against each other during installation or handling, the enamel layers 7 and 10 that are in contact with each other have different hardnesses. Therefore, the hard side enamel layer 7 compresses the soft enamel layer 10, and wear of the enamel layers 7 and 10 due to friction is significantly reduced.

To explain this in more detail, suppose that enameled wires each having a hard enamel layer are twisted together. What will happen if the enameled wires are pressed together in this state and they rub against each other? Since there is no place to absorb the mutually acting pressing force and rubbing force, they act directly on the surfaces of each other's enamel layers, and the As a result, they mutually wear out. On the other hand, in the present embodiment, in which the adjacent enamel wires are composed of an enameled wire with a hard enamel layer and an enameled wire with a soft enamel layer, the enameled wires are pressed against each other to prevent rubbing. What happens when it occurs is the pressing force,
The rubbing forces are absorbed by the deformation of the soft enamel layer, so that the wear of the enamel layer is significantly reduced. Note that the insulation properties between the enameled wires when the soft enamel layer is deformed can be sufficiently ensured because the enameled wires with the hard enamel layer are intact and the soft enamel layer is also simply deformed.

In the above embodiment, the hard enamel layer 7
The case where polyamide-imide resin is used as the enamel layer and polyurethane resin is used as the soft enamel layer 10 is shown, but in addition to these, polyamide,
Polyester or polyesterimide resins are used, and sonobuoy cables can be created with various combinations of enamel layers based on the differences in abrasion resistance of these resins. If I may add,
The polyurethane resin used as the soft enamel layer 10 in the above embodiment may be used as a relatively hard enamel layer depending on the combination, and in that case, for example, oil-based enamel may be used as the soft enamel layer. Ru.

Further, as shown in FIG. 1, a considerably large tension is applied to the sonobuoy cable 2 used in connection between the buoy 1 and the sonar 3 when the buoy 1 is rocked by waves. From this, it is also conceivable that the electric conductor 9 of the enameled wire 8 having the soft enamel layer 10 is made of iron wire, steel wire, hard steel wire (piano wire), hard stainless steel wire, etc., and that this also serves as a tension member.

Further, in the above embodiment, an extruded rubber layer is used as the protective layer 11, but the protective layer 11 is not limited to this, and it is also possible to use, for example, an extruded plastic layer, a layer wrapped in rubber/plastic tape, or a braided layer made of fibers. .

Furthermore, the number of enamelled wires used is not limited to the number shown in the above embodiments, but can be changed as appropriate.

[Effect of idea]

As described above, according to the present invention, since enameled wires having enamel layers of different hardness are mixed and twisted, damage to the enamel layer caused by rubbing of the enameled wires against each other can be significantly reduced, and therefore each The lifespan of electrical lines can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view showing how a sonobuoy cable is used, and FIG. 2 is a cross-sectional view showing an embodiment of the present invention. 1: Buoy, 2: Cable for sonobuoy, 3: Sonar, 5, 8: Enamel wire, 6, 9: Conductor, 7, 1
0: Enamel layer, 11: Protective layer.

Claims (1)

[Scope of utility model registration request] A sonobuoy cable characterized by being made by mixing and twisting enameled wires having enamel layers of different hardness.