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Electric anti-corrosion system, sea water pump and sea water desalination device

A technology of electric corrosion prevention and water flow, which is applied in seawater treatment, osmosis/dialysis water/sewage treatment, general water supply saving, etc. It can solve the problems of high price and unoptimized cost, and achieve the effect of low cost

Inactive Publication Date: 2018-01-30
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrical corrosion protection systems described in Patent Document 1 and Patent Document 2 use expensive insoluble platinum (Pt) electrodes as electrodes, which is not preferable from the viewpoint of cost reduction.

Method used

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  • Electric anti-corrosion system, sea water pump and sea water desalination device
  • Electric anti-corrosion system, sea water pump and sea water desalination device
  • Electric anti-corrosion system, sea water pump and sea water desalination device

Examples

Experimental program
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Effect test

Embodiment approach 1

[0082] figure 1 It is a schematic cross-sectional view showing Embodiment 1 of the electric corrosion protection system of the present invention. Such as figure 1 As shown, the electrical corrosion protection system 100 of this embodiment has the anode electrode 7 for electrical corrosion protection, the terminal 1 for anode electrodes, the DC power supply 9, the 1st sealing member 4, and the 2nd sealing member 5. The anode electrode 7 is sandwiched except for a part by two insulating spacers 2 between flanges connecting joints of pipes (such as metal pipes) 6 for transporting seawater (not shown in the figure). Covering, a part is exposed from the gasket 2 to form a water contact surface in contact with water inside the metal pipe 6; at least a part of the terminal 1 is clamped by the gasket 2; the DC power supply 9 is connected to the anode via the terminal 1 and the wire 10 The electrode 7 is connected to the metal pipe 6, so that the anti-corrosion current flows in the w...

Embodiment approach 2

[0106] Figure 4 It is a schematic cross-sectional view showing Embodiment 2 of the electric corrosion protection system of the present invention. exist Figure 4 In the figure, only the gasket 401, the anode electrode 402, the terminal 403, the connector 406, the first sealing member 404, the second sealing member 405, and the third sealing member 407 are shown, and the metal pipe and the terminal connected to the metal pipe are omitted. , and a DC power supply connected to the metal pipe and the anode electrode respectively via wires. In this embodiment, the difference from Embodiment 1 lies in that the second sealing member 405 seals between the anode electrode 402 and the terminal 403 , and the shape of the anode electrode 402 is also different.

[0107] Such as Figure 4 As shown, the cross-sectional shape of the anode electrode 402 is a triangle. In low-voltage corrosion protection with constant current density, the anodic current decreases with thickness reduction, ...

Embodiment approach 3

[0109] Figure 5 It is a schematic cross-sectional view showing Embodiment 3 of the electric corrosion protection system of the present invention. exist Figure 5 In the figure, only the gasket 501, the anode electrode 502, the terminal 503, the connector 507, the first sealing member 504, the second sealing member 505, and the third sealing member 508 are shown, and the metal pipe and the terminal connected to the metal pipe are omitted. , and a DC power supply connected to the metal pipe and the anode electrode respectively via wires. In this embodiment, the difference from Embodiment 1 is that: the second sealing member 505 seals between the anode electrode 502 and the terminal 503 , and an organic binder 506 is provided between the anode electrode 502 and the gasket 501 . In this way, the adhesion between the anode electrode 502 and the gasket 501 can be improved, and the aggravation of crevice corrosion occurring at the interface between the anode electrode 502 and the ...

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Abstract

The invention relates to an electric anticorrosion system, a seawater pump and a seawater desalination device. The corrosion resistance of piping materials such as seawater pumps and seawater desalination devices can be improved at low cost and high efficiency. This electrical anti-corrosion system is used to suppress corrosion of pipes for water passage, and has an anode electrode for electrical anti-corrosion. Clamped so as to be covered except for a part exposed from the gasket to constitute a water contact surface in contact with water inside the pipe; a terminal for an anode electrode, at least a part of which is clamped by the gasket; direct current A power supply, the DC power supply is connected to the anode electrode and the pipe through terminals and wires, so that the anti-corrosion current flows in the water passage part of the pipe; the first sealing member, which seals between the flange part and the gasket; the second sealing member , which seals between the gasket and the terminal or between the anode electrode and the terminal; and a third sealing member which seals the outer periphery of the connector.

Description

technical field [0001] The present invention relates to an electrical anti-corrosion system for piping for passing water, and in particular to an external power source type electrical anti-corrosion system suitable for anti-corrosion of piping for transporting seawater, a seawater pump, and a seawater desalination device. In addition, "water" here includes "sea water". Background technique [0002] Seawater pumps are not only used to draw seawater from the sea to cool mechanical equipment, but also used as an injection system to inject seawater in oil fields, etc. into oil reservoirs, and then extract oil components. In addition, the development of technologies for desalinating seawater using seawater desalination devices for use in industry, agriculture, and drinking is advancing. In particular, in a large seawater desalination device using RO membrane (reverse osmosis membrane: Reverse Osmosis), a large number of metal pipes are required, and since metal pipes determine t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F13/00C02F1/44B01D61/10C02F103/08
CPCY02A20/131Y02A20/144
Inventor 大桥健也小林玲绪
Owner HITACHI LTD