| 摘要 |
1467247 Electric water heaters S A WILLIAMS 23 July 1974 [24 July 1973] 35166/73 Heading F4A An electric water heating boiler having an operating voltage between two electrodes in excess of 1 kV (preferably in the range 11-13 kV) comprises a horizontally or near horizontally arranged tubular steel casing 3 which functions as one electrode and has water inlet and outlet chambers 6, 7 at opposite ends, and a further electrode 4 formed of cast iron and extending along the direction of water flow; a porcelain pipe 14 being supported in a tubular member 13 which can slide along the casing to cover (Fig. 4) or uncover (Fig. 5) the electrode 4 and control the current flow. A flow control nozzle 15 is secured to the member 13 and a lead screw arrangement 21 is rotated to move the member 13. In the preferred embodiment three side-byside casings 3 are employed each earthed with their respective electrodes 4 connected each to one phase of a three phase supply. Inlets 6 and outlets 7 are connected to pipes 8, 9 and a shaft 24 rotates all the lead screws 21 in unison.
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