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Method for electrically connecting non corrodible anodes to the corrodible core of a power supply cable
| Details |
Inventors: Bianchi, Guiseppe; Mussinelli, Gian L.;
Assignee: Oronzio de Nora (Lugano, CH)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
The invention relates to an improved method to connect one or more non corrodible, valve metal anodes whose surface has been activated by a deposit of non passivatable material, to a power supply cable, insulated by a sheath of rubber or other elastomeric material, to make flexible anode assemblies to be used for the cathodic protection of metallic structures, either in water or soil environments. Each anode is provided with a valve metal sleeve, which may be inserted along the cable and then swaged first directly onto the cable's conducting core, previously stripped of its insulating sheath, in correspondence of the central portion of the sleeve, and subsequently swaged at the two ends directly onto the insulating sheath of the cable. Bushes of a ductile metal or alloy, preferably anodically dissoluble, are disposed onto the valve metal sleeve before swaging, in order to take up the wrinkling and allow a more uniform circumferential reduction of the valve metal sleeve over the cable. |
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DETAILED DESCRIPTION OF THE INVENTION The method of the present invention is particularly suited to connect one or more anodes placed and fixed at intervals along an insulated power supply cable passing coaxially through the anode or the various anodes without interruptions and which acts both as the supporting element as well as the current conducting means to the anode or anodes.
The cable is flexible and is made of plaited or stranded wires of a conducting metal such as copper or tinned copper, or aluminum and/or steel.
The cable is provided with one or more superimposed sheaths made of insulting elastomeric material resistant to the medium of utilization of the anode, such as ethylpropylene rubber (EPR) or chlorinated polysulphonated polyethylene (HYPALON.
sup.
(R)), produced by Du Pont de Nemours.
The anode, or each anode, is essentially constituted by a tube or sleeve made of a valve metal, having an internal diameter slightly larger, that is from about 1 to about 6 mm, than the external diameter of the insulated cable.
According to the method of the present invention, the insulating sheath of the cable is stripped off for a certain portion, which may be comprised between 1 cm and about 4 cm, in correspondence of the points where to the anode is intended to be fixed.
The two halves of a split collar, made of copper, tinned copper, or aluminum, and having substantially the same length of the stripped portion and substantially the same thickness of the sheath insulating the conducting core of the cable, are thence disposed around the bare conductive core.
A cylinder or bush, made or ductile metal, such as copper, aluminum, iron, cuprous-nickel alloy or valve metal is inserted over the tube or sleeve of the valve metal anode in correspondence of the fixing point.
The bush may have a wall thickness comprised between 1 and 10 millimeters and a length substantially identical to the length of the split collr inserted onto the cable conducting core inside the tubular anode.
Fixing is carried out by inserting the assembly thus prepared into a segmented circular die of a swaging press and closing the die onto the external bush thus swaging (cold-heading) the valve metal tube onto the split collar and onto the conductive core of the power supply cable
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Fuel Cells 
