JPH0410217Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is a multi-point detection type used for electrolytic corrosion prevention treatment of buried pipes installed in multiple cross-sections of rails or in places where they are close to or intersect with other buried pipes, etc. This invention relates to an automatic constant potential control power supply device.

``Prior art'' An automatic constant potential control power supply device using single point detection in the prevention of electrolytic corrosion of a single rail cross section or underground pipes that are close to or intersect with other underground pipes, etc. is shown in the flow diagram in Figure 4. shown.

That is, the detected potential (pipe-to-ground potential) and the set potential are compared, and the necessary anticorrosive current is passed through the control device.The actual installation procedure is shown in FIGS. 5a and 5b.

In the figure, 1 is an underground pipe to be protected from corrosion, 2 is an electric railway rail, 2' is another underground pipe, 3 is a corrosion protection electrode, 4 is a detection electrode, and 5 is a power supply device.

However, if the buried pipe 1 is close to or intersects with multiple cross-sections of rail or other buried pipes, the above-mentioned single point detection method cannot track unbalanced potential fluctuations of other rails or other buried pipes. Otherwise, there is a risk of electrolytic corrosion, etc. Therefore, it is necessary to install detection points for each rail or buried pipe, and to provide a power supply circuit for each.

``Problem that the invention attempts to solve'' However, such a method has the drawback of resulting in an expensive device.

``Means for solving problems'' and ``effects'' This proposal was made in view of the above circumstances, and its gist is: automatic constant potential control of one circuit used for electrolytic corrosion prevention treatment of buried pipes. In the power supply device,
The pipe-to-ground potential values detected simultaneously at multiple points are input into a microcomputer, calculated, and compared with the set potential. According to the most noble value of the detected potential, the point showing the noblest value is determined through the necessary anticorrosion current. The point is that the device can be simplified while maintaining the anti-corrosion potential.

"Example" This will be explained in detail below based on the drawings.

FIG. 1 is a flowchart of the present invention, and the present invention will be explained using the same figure as follows.

That is, multiple potential detection devices are installed close to underground pipes (a), and the detected potential is amplified and A/D converted by an OP amplifier (b), and then input to a microcomputer for calculations (c). ) compared with the set potential (d),
Select the value that indicates the most noble potential and display it on the display (e).
and D/A conversion (f), and potential control circuit (g).
This is a cathodic protection power supply device that flows the necessary corrosion protection current.

The actual installation procedure is shown in Figures 2a and b.

Components that are the same as those in FIG. 5 are given the same reference numerals.
2b, 2c multiple electric railway tracks and other buried pipes, 4
a, 4b, and 4c indicate a plurality of detection electrodes, respectively.

Therefore, according to the proposed device, even if there are different values at multiple points, the most necessary detection potential is selected and the corrosion protection is reliably achieved by a single power supply in order to flow the necessary corrosion protection current. But it can be achieved.

FIG. 3 shows an example of the operation of the present device for the plurality of potential detection devices (three) shown in FIG. 2.

``Effects of the invention'' The effects of the above-mentioned proposal on merits can be enumerated as follows.

Control is based on multiple potential detections, reducing the risk of electrolytic corrosion.

In conventional multi-point detection, multiple control circuits are required, making it complicated and costly, but this method allows for miniaturization and is inexpensive.

Potential detection can be displayed digitally at all times, making monitoring easy.

[Brief explanation of the drawing]

Fig. 1 is a flow diagram of the proposed device, Fig. 2 a and b is an explanatory diagram of the installation procedure of the proposed device, Fig. 3 is a diagram showing an example of the operation of the proposed device, and Fig. 4 is automatic constant potential control using single point detection. Power supply flow diagram, Figure 5 a, b
4 is an explanatory diagram of the installation procedure of the device shown in FIG. 4. FIG. 1...Underground pipe, 2...Electric railway track, 2'...
Other buried pipes, 2a, 2b, 2c...Electric railway tracks, 2
a', 2b', 2c'... Buried pipe, 3... Anti-corrosion electrode, 4
...Detection electrode, 4a, 4b, 4c...Detection electrode, 5...Power supply device.

Claims (1)

[Scope of utility model registration request] In a single-circuit automatic constant potential control power supply device used to prevent electrolytic corrosion of buried pipes installed in multiple cross-sections of rails or in places where they intersect with other buried pipes, etc.,
The pipe-to-ground potential values detected simultaneously at multiple points are input into a microcomputer, calculated, and compared with the set potential. According to the most noble value of the detected potential, the point showing the noblest value is determined through the necessary anticorrosion current. A multi-point detection type automatic constant potential control power supply device characterized by maintaining an anti-corrosion potential.