Water tank having electric heating element and cathodic corrosion protection
US4255647A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1978 |
| Grant date | Mar 10, 1981 |
| Priority date | — |
| Expiry date | Oct 25, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B3/82
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An anticorrison protected small electric household water heating tank includes a metal tank having a passive anticorrosive layer provided on an inner wall thereof. A U-shaped electric immersion heating element is horizontally arranged in a lower region of the tank. A pair of electrodes are supplied with external current, one being an external current anode horizontally arranged above and perpendicular to the arms of the U-shaped heating element and the other being the tank itself. A reference electrode is also provided in the lower region of the tank. A potentiostat is connected to the reference electrode and tank for detecting the potential between the reference electrode and tank, for comparing the detected potential between tank and reference electrode to a reference voltage and for adjusting the current flow to the external electrodes to maintain an optimum potential between the tank and reference electrode. The reference electrode is of "Ag/AgCl" and is surrounded by a flow preventing sheathing which creates a zone of stagnant water about the reference electrode. An additional anode can be provided in the upper region of the tank and the current therethrough controlled by the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.