JP3110940B2 - Control Method of External Noise for Cathodic Protection Circuit of Ship Propulsion Blade System - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling external noise for an anticorrosion circuit of a ship propulsion wing shaft system.

[0002]

2. Description of the Related Art Propulsion wings of ships are corroded by the effects of sulfides in seawater, differences in the stresses on the wing surfaces, and the impact of cavitation, and so on. An anticorrosion circuit as shown in FIG. The cathodic protection circuit as shown in FIG. 1 comprises a galvanic anode 3 provided at the tail and rudder 2 of a steel hull shell 1, and a shaft between a shaft 5 of a propulsion wing 4 and the hull shell 1. An anticorrosion current flows from the galvanic anode 3 to the propulsion wing 4, the shaft 5, and the shaft grounding circuit 6 via the seawater 7,
Is protected against electricity (Jiko 63-1324).
No. 7, JP-A No. 7, column 1, lines 9 to 19 and FIG. 1).

[0003]

By the way, the propulsion wing 4,
Since a series of cathodic protection circuits of the ship propulsion wing shaft system such as the shaft 5 (including the intermediate shaft, the thrust shaft, the crankshaft, etc.), the shaft grounding circuit 6 and the like are DC current circuits, they are provided in the engine room of the ship shown in FIG. Even if the AC noise leaked from the electric device 8 such as a generator or a motor is mixed in the cathodic protection circuit,
Although the adverse effect of the leaked AC noise on the cathodic protection effect was relatively small, however, with the introduction of high-performance electronic measuring equipment on ships such as a current meter and a depth gauge, such high noise was reduced via the cathodic protection circuit. Sensor 9a of performance electronic measuring equipment 9
Therefore, there is a problem that the leakage AC noise is mixed into the high-performance electronic measuring instrument 9 to cause a malfunction.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and the gist of the present invention is to provide a series of marine propulsion wing shaft-based cathodic protection circuits for a ship. A leaked AC noise that is mixed from the electrical equipment into the anticorrosion circuit of the ship propulsion wing shaft system is detected by a noise waveform detection circuit, and the detected noise waveform is converted into an erased waveform or a deformed waveform by an inverse waveform calculation generation circuit. And
This converted waveform output is amplified by an amplifier, and the amplified output is fed back to a high-performance electronic measuring device to control leakage AC noise (external noise) mixed into the high-performance electronic measuring device.

[0005]

According to the present invention, as described above, in a series of cathodic protection circuits of a ship propulsion wing shaft system, a leaky AC noise mixed from electric equipment of a marine vessel into the cathodic protection circuit of the marine vessel propulsion wing shaft system is detected by a noise waveform detection. The detected noise waveform is converted by the circuit into an erased waveform or a deformed waveform by the inverse waveform calculation and generation circuit, the converted waveform output is amplified by the amplifier, and the amplified output is fed back to the high-performance electronic measuring equipment. Therefore, the leaked AC noise (external noise) mixed into the high-performance electronic measuring instrument is controlled, so that the malfunction due to the leaking AC noise of the high-performance electronic measuring instrument in a ship such as a current meter and a depth gauge can be prevented. .

[0006]

FIG. 2 is an explanatory view showing a first embodiment of the method of the present invention, in which a galvanic anode 3 provided on a tail portion and a rudder portion 2 of a steel hull shell 1 and a propulsion wing 4 are shown. A shaft grounding circuit 6 is provided between the shaft 5 and the hull shell 1. The anticorrosion current (2 A to 2 A depending on the type of ship) is applied from the galvanic anode 3 to the propulsion wing 4, the shaft 5, and the shaft grounding circuit 6 via the seawater 7. In the marine vessel propulsion wing shaft-based cathodic protection circuit which is configured to flow 50A), the leakage AC noise mixed into the galvanic anode 3 from the marine electrical equipment 8 is detected via the shaft 5 of the propulsion wing 4 as a noise waveform. Detected by circuit 10,
The detected noise waveform is converted into an erased waveform or a deformed waveform by the inverse waveform calculation generation circuit 11, and the converted waveform output is amplified by the amplifier 12, and the amplified output (maximum 1) is output.
A) is fed back to the shaft 5 of the propulsion wing 4 to control the leakage AC noise (external noise) mixed into the high-performance electronic measuring device 9.

The erased waveform output by the inverse waveform calculation generation circuit 11 is a waveform obtained by converting the leakage AC noise waveform by 180 °, and the deformed waveform output is a waveform obtained by converting the leakage AC noise waveform into, for example, a square wave or an original waveform. This is a waveform converted to an integral multiple of the waveform (the larger the better).

The galvanic anode 3 is made of, for example, zinc, aluminum or an alloy thereof.

FIG. 3 is an explanatory view showing a second embodiment of the method of the present invention, in which a galvanic anode 3 provided on the tail and rudder 2 of a steel hull shell 1 and a shaft of a propulsion wing 4 are shown. A boat grounding circuit 6 comprising a shaft grounding circuit 6 between the hull shell 1 and the hull outer panel 1, wherein an anticorrosion current flows from the galvanic anode 3 to the propulsion wing 4, the shaft 5, and the shaft grounding circuit 6 via the seawater 7. In the anti-corrosion circuit of the wing shaft system, a leaked AC noise mixed into the galvanic anode 3 from the electric equipment 8 of the ship is detected by the noise waveform detection circuit 10 via the shaft 5 of the propulsion wing 4 and detected. The converted noise waveform is converted into an erased waveform or a deformed waveform by an inverse waveform calculation / generation circuit 11, and the converted waveform output is amplified by an amplifier 12, and the amplified output is supplied to an insoluble control electrode 13 provided on the tail of the hull shell 1. From seawater 7 to high-performance electronic measuring equipment 9 Than it was to control the leakage AC noise (external noise) to be mixed to the performance measuring electronics 9. In addition, as the insoluble control electrode 13, a material obtained by plating or cladding platinum on a corrosion-resistant metal such as titanium or niobium is used.

FIG. 4 is an explanatory view showing a third embodiment of the method of the present invention, in which a current-carrying anode 3 provided on a tail portion and a rudder portion 2 of a steel hull shell 1 and a shaft of a propulsion blade 4 are shown. A boat grounding circuit 6 comprising a shaft grounding circuit 6 between the hull shell 1 and the hull outer panel 1, wherein an anticorrosion current flows from the galvanic anode 3 to the propulsion wing 4, the shaft 5, and the shaft grounding circuit 6 via the seawater 7. In the anti-corrosion circuit of the wing shaft system, the leaked AC noise mixed into the galvanic anode 3 from the electric equipment 8 of the ship is transmitted from the seawater 7 via the waveform detection electrodes 14 provided at two places at the tail of the hull outer panel 1. Noise waveform detection circuit 10
The detected noise waveform is converted into an erased waveform or a deformed waveform by an inverse waveform calculation / generation circuit 11, and the converted waveform output is amplified by an amplifier 12, and the amplified output is sent to the tail of the hull shell 1. Insoluble control electrode 13 provided in
, And feeds back to the high-performance electronic measuring device 9 via the seawater 7 to control leakage AC noise (external noise) mixed into the high-performance electronic measuring device 9. In addition, as the waveform detection electrode 14, for example, a silver-silver chloride electrode,
Such as a zinc electrode.

FIG. 5 is an explanatory view showing a fourth embodiment of the method of the present invention, in which a fiber reinforced plastic is used as the hull shell 1, and the hull shell 1
Of the galvanic anode 3 provided on the tail and rudder 2 of the hull, the grounding copper plate 14 provided on the tail of the hull shell 1, the shaft 5 of the propulsion wing 4, the galvanic anode 3 and the grounding copper plate 15 And a common shaft grounding circuit 6 between them, so that an anticorrosion current flows from the galvanic anode 3 through the seawater 7 to the propulsion wing 4, the shaft 5, and the shaft grounding circuit 6. In the circuit, a leakage AC noise mixed into the common shaft grounding circuit 6 from the electric equipment 8 of the ship is detected by the noise waveform detection circuit 10 through two places of the grounding circuit of the electric equipment 8, and the detected noise is detected. The waveform is converted into an erased waveform or a deformed waveform by an inverse waveform calculation / generation circuit 11, the converted waveform output is amplified by an amplifier 12, and the amplified output is fed back to the grounding copper plate 15 to provide a high-performance electronic measuring instrument 9. AC noise (external noise) Than it was to Gosuru. In addition, reinforcing steel materials 16 are provided at required places of the hull outer plate 1, and each of the reinforcing steel materials 16 is connected to the grounding copper plate 15, and is connected to the galvanic anode 3 via the seawater 7. It is electrically protected by the protection current.

[0012]

As described above, according to the present invention, in a series of cathodic protection circuits of a ship propulsion wing shaft system, the leakage AC noise mixed into the marine vessel propulsion wing shaft system from the electric equipment is described. The noise waveform is detected by a noise waveform detection circuit, and the detected noise waveform is converted into an erased waveform or a deformed waveform by an inverse waveform calculation generation circuit, and the converted waveform output is amplified by an amplifier. To control the leakage AC noise (external noise) mixed into the high-performance electronic measurement equipment, thereby preventing malfunctions due to the leakage AC noise of the high-performance electronic measurement equipment in ships such as current meters and depth gauges. be able to.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a conventional example of a cathodic protection circuit of a ship propulsion wing shaft system.

FIG. 2 is an explanatory view showing a first embodiment of the method of the present invention.

FIG. 3 is an explanatory view showing a second embodiment of the method of the present invention.

FIG. 4 is an explanatory view showing a third embodiment of the method of the present invention.

FIG. 5 is an explanatory view showing a fourth embodiment of the method of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 hull outer plate 2 rudder 3 galvanic anode 4 propulsion wing 5 propulsion wing shaft 6 shaft grounding circuit 7 seawater 8 ship electrical equipment 9 high-performance electronic measurement equipment 9a sensor 10 noise waveform detection circuit 11 reverse waveform calculation generation circuit 12 Amplifier 13 Insoluble control electrode 14 Waveform detection electrode 15 Grounding copper plate 16 Reinforcing steel

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C23F 13/00-13/22 B63B 59/00

Claims (4)

(57) [Claims] 1. A galvanic anode provided on a tail and a rudder of a steel hull shell, and a shaft grounding circuit between a shaft of a propulsion wing and a hull shell, wherein seawater is supplied from the galvanic anode. Propulsion wings, shafts, in an anticorrosion circuit of a ship propulsion wing shaft system in which an anticorrosion current flows through a shaft grounding circuit, leakage AC noise mixed into the galvanic anode from the electric equipment of the ship, The noise waveform is detected by a noise waveform detection circuit via the axis, the detected noise waveform is converted into an erased waveform or a deformed waveform by an inverse waveform calculation generation circuit, and the converted waveform output is amplified by an amplifier. A method of controlling external noise for an anticorrosion circuit of a ship propulsion wing shaft system, wherein feedback to an axis of the propulsion wing is performed to control leakage AC noise mixed into high-performance electronic measuring equipment. 2. A galvanic anode provided on a tail and a rudder of a steel hull outer panel, and a shaft grounding circuit between a shaft of a propulsion wing and the hull outer panel. Propulsion wings, shafts, in an anticorrosion circuit of a ship propulsion wing shaft system in which an anticorrosion current flows through a shaft grounding circuit, leakage AC noise mixed into the galvanic anode from the electric equipment of the ship, The noise waveform is detected by a noise waveform detection circuit via the axis, and the detected noise waveform is converted into an erased waveform or a deformed waveform by an inverse waveform calculation generation circuit.
It is amplified by an amplifier, and this amplified output is fed back to high-performance electronic measurement equipment via seawater from an insoluble control electrode provided at the tail of the hull outer panel, and leakage AC noise mixed into high-performance electronic measurement equipment is controlled. A method for controlling external noise for a cathodic protection circuit of a ship propulsion wing shaft system, characterized by: 3. A galvanic anode provided on a tail and a rudder of a steel hull outer panel, and a shaft grounding circuit between a shaft of a propulsion wing and the hull outer panel, wherein seawater is supplied from the galvanic anode. In the marine propulsion wing shaft system, an anticorrosion current is supplied to the propulsion wing, the shaft, and the shaft grounding circuit via the marine vessel. It is detected by a noise waveform detection circuit via a waveform detection electrode provided at the tail of the plate, and the detected noise waveform is
The inverted waveform calculation and generation circuit converts the waveform into an erased waveform or a deformed waveform, amplifies the converted waveform output with an amplifier, and then amplifies the amplified output from an insoluble control electrode provided at the tail of the hull outer panel via seawater for high-performance electronic measurement. A method of controlling external noise for a cathodic protection circuit of a ship propulsion wing shaft system, wherein the noise is fed back to equipment and controls leakage AC noise mixed into high-performance electronic measuring equipment. 4. A galvanic anode provided on a tail and a rudder of a hull skin made of fiber reinforced plastic, a grounding copper plate provided on a tail of the hull skin, a shaft of a propulsion wing, a galvanic anode, and grounding. And a common shaft grounding circuit between the copper plate and the propulsion wing, the shaft, and the seawater from the galvanic anode through seawater. A leaked AC noise mixed into the galvanic anode from electrical equipment of a ship is detected by a noise waveform detection circuit through the grounding copper plate, and the detected noise waveform is erased by an inverse waveform calculation generation circuit or A ship characterized by converting the output into a deformed waveform, amplifying the output of the converted waveform by an amplifier, feeding back the amplified output to the grounding copper plate, and controlling leakage AC noise mixed into high-performance electronic measuring equipment. Control method of external noise for cathodic protection circuit of ship propulsion wing shaft system.