JPH052602Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an external power supply anode for cathodic protection used for corrosion protection of ice-resistant offshore structures and icebreakers whose outer panels are susceptible to external forces from drift ice. be.

[Conventional technology]

BACKGROUND OF THE INVENTION In order to prevent corrosion of the outer panels of marine structures, ships, etc., anticorrosion paints and cathodic protection devices have conventionally been used in combination.

For ice-resistant offshore structures and icebreakers, which constantly come into contact with and undergo repeated friction with drifting ice, the anticorrosive paint film applied to their outer panels is easily scratched off and damaged by drifting ice, so cathodic protection equipment is not required. It is especially necessary to use these in combination.

Cathodic protection devices for marine structures and ships include galvanic anode systems and external power systems.

In the case of the galvanic anode method, although there are some differences depending on the shape of the anode, generally the anode 1
The current generated per piece is extremely small at 1 to 2A.
A large number of anodes are required to obtain the desired protection current.

On the other hand, in the case of the external power supply method, the generated current per anode (insoluble anode) is 25 to 75 A, so the number of anodes required to obtain the desired anticorrosion current is small.

[Problem that the invention attempts to solve]

In the case of the galvanic anode method, since the anode is installed in a protruding manner on the outer surface of the structure, it is easily damaged by external forces caused by drifting ice, and therefore it is not suitable for application to ice-resistant offshore structures and icebreakers. is unfavorable in terms of anti-ice friction.

On the other hand, in the case of an external power supply system, the structure of the anode is complicated, so there is a problem that its function is easily destroyed by contact with drift ice.

In order to solve the above problem, conventionally, the fifth
As shown in the figure, in order to avoid contact between the anode 16 and drift ice, a recess 18 is attached to the surface of the outer panel 1 so as to surround the anode 16, or as shown in FIG. Outer panel 1
A method of attaching it to a position where it does not come into contact with the drift ice 17 on the surface of the ship was used.

However, since the guard provided by the recess 18 shown in FIG. 5 is not complete, it is not possible to prevent the contact between the anode 16 and the drift ice. Since the anode 19 and the anode 19 are far apart from each other, there is a problem that the anticorrosive effect is not sufficient.

For this reason, in ice-resistant marine structures, icebreakers, etc., cathodic protection using external power sources and galvanic anode methods cannot fully demonstrate their functions, and they rely solely on corrosion protection using anticorrosive paints as described above. is the current situation.

However, as mentioned above, ice-resistant marine structures and icebreakers are constantly in contact with drift ice and repeatedly subjected to friction, so applying only a coating of anti-corrosion paint can cause damage to the outer panels of marine structures and ships. It is easy to use, and its use in combination with cathodic protection is strongly desired.

Therefore, the purpose of this invention is to provide an anode that is not damaged by drifting ice, in order to enable cathodic protection of ice-resistant marine structures and ships such as icebreakers using an external power supply system.

[Means for solving problems]

This invention is an externally powered anode used in cathodic protection equipment for outer panels of structures, ship hulls, etc., wherein the anode is inserted into an opening provided in the outer panel at right angles to the outer panel. a cylindrical body, a moving mechanism disposed within the outer plate for causing the cylindrical body to emerge and retract from the opening, and a disc-shaped insoluble anode metal plate attached to the distal end surface of the cylindrical body. It has particular characteristics.

Next, this invention will be explained with reference to the drawings.
FIG. 1 is a sectional view showing one embodiment of this invention, and FIGS. 2 to 4 are perspective views.

As shown in FIGS. 1 to 4, the external power supply anode of this invention is inserted into a circular opening 2 bored in the outer panel 1, perpendicular to the outer panel 1, and its tip surface is open. , a cylinder 3 with a convex cross section consisting of a large diameter part at the tip and a small diameter part at the rear end, a disk-shaped insoluble anode metal plate 4 attached to the front end surface of the cylinder 3, and an inner side of the outer plate 1. The moving mechanism 5 for the cylindrical body 3 is provided.

The insoluble anode metal plate 4 (hereinafter referred to as metal plate) is
It is attached to the distal end surface of the cylinder 3 via an insulating packing 10 and a packing retainer 11 with bolts 12.

A disk-shaped epoxy resin body 13 is fitted into the tip of the cylinder 3 and comes into contact with the disk-shaped metal plate 4 .

One end of a lead wire 14 is connected to the epoxy resin body 13, and the other end of the lead wire 14 is connected to the cylindrical body 13.
It is connected to an external power source (not shown) through the rear end surface 3a and further through a part of the side wall of the second cover body 8, which will be described later.

A rod 6a of a hydraulic cylinder 6 is attached to the center of the rear end surface 3a of the cylinder 3 in a direction perpendicular to the outer plate 1.

Inside the outer plate 1, the tip has the same diameter as the opening 2,
A cylindrical first cover body 7 whose rear end portion has an inner diameter slightly larger than the small diameter portion of the cylindrical body 3 and whose top and bottom are open is fixed to the peripheral edge of the opening 2 so as to surround the cylindrical body 3. There is.

The upper end of the first cover body 7 has a circular hole in the center of the lower end surface into which the small diameter part of the cylindrical body 3 is inserted.
A second cover body 8 whose axis is orthogonal to the outer plate 1 is fixed.

Inside the second cover body 8, there is provided a hydraulic cylinder 6 whose cylinder body is fixed to the center inside the upper end surface, and the tip of the rod 6a is connected to the cylinder body 3.
It is fixed to the rear end portion 3a of the.

The hydraulic cylinder 6, the first cover body 7, and the second cover body 8 constitute the moving mechanism 5.

A cylindrical body 3 is provided on the inner peripheral surface of the small diameter portion of the first cover body 7.
A thrust sleeve 9 is fitted into which the outer circumferential surface of the small diameter portion of the thrust sleeve 9 comes into contact.

Two O-rings 15 for sealing are fitted onto the inner peripheral surface of the first cover body 7.

By the operation of the hydraulic cylinder 6, the cylindrical body 3 is moved up and down, so that the front end surface of the cylindrical body 3, together with the metal plate 4, is placed on the outside of the outer plate 1, as shown in FIGS. 2 to 4. It protrudes, is located substantially flush with the outer panel 1, or is housed within the outer panel 1.

[Effect]

Next, the operation of this invention will be explained.

If there is no drift ice in the sea area, the second
As shown in the figure, the cylindrical body 3 is made to protrude from the outer plate 1.

The corrosion protection effect of the cathodic protection device is greatest in this state where the cylindrical body 3 protrudes from the outer plate 1.

In seawater or when a large amount of drift ice is floating, the cylindrical body 3 is housed within the outer panel 1 as shown in FIG. 4 to avoid contact between the cylindrical body 3 and the drift ice.

When this device is applied to a ship such as an icebreaker, the tip end surface of the cylindrical body 3 is positioned approximately flush with the outer plate 1 during normal sailing of the ship, as shown in FIG.

It is also possible to fix the anode in that state with a relatively weak restraining force to prepare for an unexpected situation in which the anode collides with an ice block during navigation or operation.

That is, the anode, which is fixed with a relatively weak restraining force, is easily accommodated within the outer panel 1 by contact with the ice block, and the impact force applied to the anode can be avoided. Furthermore, by making full use of automatic control technology, the anode tip surface can always be set flush with the outer plate surface with a weak restraining force.
It is also possible to repeat the above action.

[Effect of idea]

As explained above, the externally powered anode of this invention can prevent damage due to contact with drift ice by moving it in and out of the outer panel depending on the state of the ice, so it can be used for ice-resistant marine structures, icebreakers, etc. Cathodic protection can also be applied to ships, and when used in combination with anticorrosion paint, industrially useful effects can be obtained that help prevent corrosion of the outer panels of ice-resistant marine structures, icebreakers, etc.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of this invention;
FIGS. 2 to 4 are perspective views, and FIGS. 5 to 6 are views showing conventional anode damage prevention means. In the drawings, 1... Outer plate, 2... Opening, 3... Cylindrical body, 3a...
... Rear end surface, 4 ... Insoluble anode metal plate, 5 ... Movement mechanism, 6 ... Hydraulic cylinder, 6a ... Rod, 7
...First cover body, 8...Second cover body, 9...
Thrust sleeve, 10...Insulating packing, 11
...Packing holder, 12...Bolt, 13...Epoxy resin body, 14...Lead wire, 15...O ring, 16...Anode, 17...Drift ice, 18...
...Recess, 19...Anode.

Claims (1)

[Claims for Utility Model Registration] An externally powered anode used in a cathodic protection device for outer panels of structures, ship hulls, etc., wherein the anode is inserted into an opening provided in the outer panel perpendicular to the outer panel. a cylindrical body that is inserted into the cylindrical body, a moving mechanism disposed within the outer plate for moving the cylindrical body in and out of the opening, and a disk-shaped insoluble anode metal attached to the tip surface of the cylindrical body. An external power supply anode for cathodic protection, characterized by comprising a plate.