JP2005089857A - Method for preventing electrolytic corrosion by vibrating power generation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To generate power from vibrational energy in an installed place for reducing the frequency of battery exchange or charging and reducing maintenance inspection cost, and to charge the power source. <P>SOLUTION: Vibration applied to a structure from environments and using conditions such as a bridge, an engine, a billow or the like is utilized to generate power, and the power is rectified so as to charge a d.c. power source. The power source is utilized for a cathode corrosion prevention method or an anode corrosion prevention method, and electric potential is retained between a structural metal easy to be corroded such as a reinforcing rod and a light alloy and a sacrificial electrode to prevent the corrosion of the structural metal. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  Involved in corrosion prevention methods for concrete reinforcing bars, light alloys of moving objects, etc.

  In order to prevent corrosion of iron, aluminum alloy, etc., it is effective to keep the metal in a negative polarity and prevent ionization, and a cathode corrosion protection method in which a sacrificial metal is connected to the positive side of the power source is known.

  One of the problems in the technical field is the cost of wiring the power supply to a remote place or the long-term maintenance of the battery.

U.S. Pat. No. 2,273,897 Method of and means for electrically protecting against corrosive partially sublimated linear metallic structures. Feb 24, 1942, etc. describe a cathodic anticorrosion method in which a main body is a cathode and a sacrificial electrode is provided on an anode for rust prevention of underwater bridge piers. These power sources are most commonly converted from commercial AC power to DC power,

U.S. Pat. No. 5,366,604 Solar powered cathodic corrosion protection system Nov. 22, 1994 uses solar cells from the viewpoint of saving wiring costs. However, it mentions that it cannot generate electricity at night or in cloudy weather.

U.S. Pat. No. 6,346,188 B1 Battery powered cathodic protection systems Feb. In 12, 2002, a chemical battery is used.

U.S. Pat. No. 4,588,022 Anodical protection system and method May 13, 1986 discloses a method called an anodic corrosion protection method for metals to be passivated, and describes a control method adapted to complex passivation conditions. This method requires highly accurate control, but is evaluated as one that reduces the amount of power supply and reduces operating costs.

Problems to be solved by the invention

    In order to reduce the frequency of battery replacement / charging and reduce maintenance and inspection costs, power is generated from the vibration energy at the installation site and the power source is charged.

Phenomenon utilized by the present invention

Many devices for generating power from vibration have been filed, and Japanese Patent Application Laid-Open No. 10-140523 can be cited as a power source that uses a vibration generator that uses mechanical vibration as an energy source, such as a road bridge and an engine.

Summary of the Invention

Prevention of electric corrosion is widely used as a method for preventing corrosion of reinforcing bars of structures, particularly concrete. The effect has been demonstrated, but the application area is limited. One of the reasons is securing the power supply. Structures are widely distributed and the cost of wiring commercial power is high. Battery-based methods are expensive to charge and maintain. Solar cells are useful as a solution, but their performance drops at night and on cloudy days.

Among the structures, roads and bridges are subject to vibrations caused by traveling cars and trains, and vibrations caused by wind are also significant. There are ideas to use these vibrational energy for power generation, but very few have been put into practical use. In order to make the purpose of lighting etc., the amount of power generation was insufficient, and it was impossible to economically.

The current required to prevent galvanic corrosion is 0.01 A to 0.05 / square meter in soil by the cathode method and 0.015 A to 0.15 A / square meter in seawater. Is more effective with less current. Since the voltage is several volts against the ionization, there are vibration powers everywhere to cover this. On bridges, vibrations caused by passing vehicles and wind, and on ships can use wave vibrations even when stopped.

Embodiments for carrying out the present invention

A vibration generator is mounted on the vibration portion of the target location to generate power, and the output is rectified to charge the battery. In the cathodic protection method, the positive electrode of the battery is connected to a sacrificial metal, and the negative electrode is connected to a reinforcing bar or aluminum metal to be prevented from corrosion.

When piezoelectric is used as the vibration generator, the configuration is simple, but it becomes a high-voltage, small-current type, and requires a converter for converting to a low voltage required for electrolytic corrosion prevention.

As a form using a general-purpose electromagnetic rotary generator, in FIG. 1, the vertical vibration 11 of the floor 4 is transmitted to the mass 1 supported by the spring 3. This system is analyzed as a dynamic damper in mechanical mechanics, and a vertical vibration several times the floor vibration is excited to 1. The relative movement between the floor 4 and the mass 1 rotates the gear 6 via the rack 5, and the coaxial generator 2 swings and rotates to generate power. Since the voltage is alternating current, it is rectified by the rectifier circuit 9 and the battery 10 is charged. The actual circuit is complicated, such as being stabilized in response to the changing AC voltage, but it is a conceptual circuit diagram.

Embodiment in which a vibration generator is mounted on a bridge In FIG. 2, vibration 11 is excited by a vehicle traveling on the bridge girder 4. The plus side 7 of the output of the built-in vibration generator is connected to the sacrificial metal 13, and the minus side 8 is connected to the reinforcing bar 12. As a result, corrosion occurs only on the sacrificial metal and the rebar is protected.

In a similar configuration, a ship is made to generate electricity by vertical vibration caused by waves, and a corrosion resistance effect is obtained by connecting the structure metal to a minus and the sacrificial metal to a plus.

The engine section generates higher frequency vibrations. When a vibration generator that matches this frequency is installed and the structural metal is connected to the negative and the sacrificial metal is connected to the positive, the same effect can be obtained with a small generator. Can be obtained.

Figure 1

1 is an inertial mass, 2 is a generator, 3 and 3 ′ are coil springs connected to 1 and the main vibrating body 4. A rack 5 meshes with a gear 6 directly connected to the motor shaft. The output terminal of the generator 2 is rectified by the rectifier 9 and stored in the battery 10. 7 is a positive output and 8 is a negative output.

Fig-2

Reference numeral 4 denotes a main vibration body, and this figure illustrates a bridge girder of the bridge. The generator is embedded in it. Reference numeral 11 denotes a main vibration direction accompanying traveling of the vehicle, and 1 denotes a mass of the vibration generator. The other generator elements are the same as in FIG. 1, but the lead lines are omitted. 12 is a reinforcing bar connected to the negative pole of 8. A sacrificial electrode 13 is connected to the positive electrode 7.

Fig-3

Patent Document 1: U.S. Patent 2,273,897

Fig.4

The figure which shows transition of the power generation capacity of 1 day of patent document 2 US patent 5,366,604

Claims (2)

An electric corrosion prevention method characterized by rectifying electricity generated from vibration of a structure and maintaining a potential between a metal that is easily corroded and a sacrificial metal using the electricity as a power source The vibration generator is an electromagnetic generator and generates electric power by relative movement between a structure and a mass supported by the structure via an elastic body.

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