JPS601434Y2 - underwater discharge electrode - Google Patents

Description

[Detailed description of the invention] This invention relates to the structure of an underwater discharge electrode used as a sound source for submarine geological exploration equipment. High heat is instantaneously generated near the flowing discharge surface, causing bubbles to expand rapidly and generate powerful sound waves.

Also, when these bubbles disappear, they generate sound waves.

In this way, the underwater discharge electrode performs a spark discharge in the water every time the transmitter discharges, and the sound waves generated at the time of discharge are used as a sound source for the submarine geological exploration device.

Conventionally, as this type of underwater discharge electrode, a coaxial type discharge electrode having the structure shown in FIG. 1 has been used.

In the figure, 11 is a metal conductor, 12 is an insulator, and 13 is an external conductor. When high voltage is applied between the conductors 11 and 13, spark discharge is generated between the ends of the conductors 11 and 13 in water. It is particularly used as a sound source for low frequencies (100H2).

However, with this structure, the portion of the discharge surface disappears relatively stably until the discharge energy reaches about 200 joules, but when the energy becomes large (over 500 joules), the insulating resin on the discharge surface portion becomes large. This has the disadvantage that the discharge electrode itself is often destroyed, making it impossible to use it continuously.

For larger energy applications, an underwater discharge electrode as shown in Figure 2 has been prototyped, but in this case it has a structure in which neoprene rubber 22 is baked on the outer periphery of a conductor 21, which corresponds to the outer conductor 13 in Figure 1. A return conductor is placed in this vicinity.

However, with this structure, air bubbles often remain inside the rubber 22, making the material non-uniform, and the adhesive strength is weak, so it may flake off when a discharge is generated with a large amount of energy, and the rubber It was not possible to use it continuously because there was a hole in the middle.

The present invention provides an underwater discharge electrode that can be used repeatedly and continuously even when the discharge energy increases.

In order to achieve this object distantly, the present invention provides an arrangement in which the outer periphery of an elongated cylindrical metal conductor is covered with an insulator, and an external electrode provided at a position electrically insulated from the metal conductor and the metal conductor. In the in-ice discharge electrode, an insulating layer containing non-metal fibers is formed around the outer periphery of the metal conductor, and the non-metal fibers are formed at predetermined pitch intervals so as to surround the outer periphery of the metal conductor. The fiber forming direction is substantially parallel to a plane perpendicular to the longitudinal direction of the metal body.

Therefore, even if the electrodes are worn out due to discharge,
Since the electrode falls off along the ring-shaped non-metallic fibers that surround the consumable part of the electrode, the discharge area increases rapidly and a sudden drop in current density is less likely to occur, making it possible to maintain a constant current density and easily maintain sound production. There are advantages to being able to do so.

Embodiments of the present invention will be described below with reference to the drawings.

Referring to FIG. 3, it is composed of a metal conductor 31, a resin-impregnated glass fiber insulator 32 wrapped around the conductor 31, and a polyester tape 33 wrapped around the outside.

In this case as well, a return conductor is provided nearby as in FIG.

The metal conductor 31 may be threaded or knurled to increase its area so that the glass fiber resin can easily adhere to it.

Next, the insulator 32 is formed so that the fiber direction is approximately perpendicular to the length direction of the metal conductor 31.

Here, forming the fibers so that the fiber direction is substantially perpendicular to the length direction of the metal conductor 31 means that, for example, ring-shaped non-metal fibers are formed on the outer periphery of the metal conductor 31 on a plane perpendicular to the length direction of the conductor 31. When arranged approximately parallel to each other at a predetermined interval,
As in the case where one non-metal fiber is spirally wound around the outer periphery of the metal conductor 31 at a predetermined pitch, the non-metal fiber is formed to surround the outer periphery of the metal conductor 31, and the direction of the fiber formation is the same as that of the metal conductor. This means that it is approximately parallel to a plane perpendicular to the length direction of the conductor.

Therefore, the fibers have the effect of preventing peeling during discharge, and when the discharge surface of the metal conductor 31 is consumed, the insulator 32 is destroyed in almost the same way as the metal conductor 31, so that the discharge surface is always discharged with the same shape.

That is, when the insulator 32 wears out, the fibers wound in the direction perpendicular to the length direction of the metal conductor 31 become an obstacle, so that the wear occurs at every arrangement interval of the fibers.

The polyester tube 33 is used to prevent the adhesive resin impregnated into the insulator 32 from melting and flowing out during heat processing.

Further, by changing the diameter of the metal conductor 31, consideration is given to the consumption rate of the metal conductor depending on the magnitude of discharge energy and the discharge efficiency depending on the size of the discharge surface.

As described above, the underwater discharge electrode according to the present invention has the advantage that the discharge surface always has the size of the cross section of the metal conductor, so stable sound can be produced and no maintenance is required.

[Brief explanation of the drawing]

Figure 1 is a partially sectional side view of a coaxial underwater discharge electrode that has been used conventionally, Figure 2 is a partially sectional side view of a prototype high-energy underwater discharge electrode, and Figure 3 is an underwater discharge according to the present invention. FIG. 3 is a partially cross-sectional side view of an electrode. 11...Metal conductor, 12...Insulator (
polyethylene), 13...outer conductor, 21...
... Metal conductor, 22 ... Insulator (neobrene rubber), 31 ... Metal conductor (screw or knurl processing), 32 ... Insulator (resin-impregnated fiber) ,3
3...Polyester tape.

Claims (1)

[Scope of utility model registration request] In an underwater discharge electrode, the outer periphery of an elongated cylindrical metal conductor is covered with an insulating material, and a discharge is caused between the metal conductor and an external electrode provided at a position electrically insulated from the metal conductor. An insulating layer containing non-metallic fibers is formed on the outer periphery of the conductor, and the non-metallic fibers are formed at a predetermined pitch so as to surround the outer periphery of the metal conductor, and the direction in which the fibers are formed is the same as the length of the metal conductor. An underwater discharge electrode characterized by being substantially parallel to a plane perpendicular to the direction.