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Gas water heaters or bath heaters

  • US 4,770,161 A
  • Filed: 03/06/1987
  • Issued: 09/13/1988
  • Est. Priority Date: 03/06/1986
  • Status: Expired due to Fees
First Claim
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1. An instantaneous gas water heater of the type without permanent pilot light, including a small turboalternator (8-10) through which the water drawn off flows and which comprises a means for generating an AC current i as a function of this through flow, means (12-14) for using this current i for lighting a main pilot light (22), means (4) for using the flow of water drawn off so as to admit gas, on the one had, to the main pilot light and, on the other hand, to a gas intake chamber, a pneumatic valve means (31-35) for controlling the intake of gas to the burner, the pneumatic valve means having a valve membrane (33) which divides the gas intake chamber of the pneumatic valve means sealingly into two compartments (35 and 35), means for controlling the opening of said pneumatic valve means by partial venting to an auxiliary pilot light (23), of one of the two compartments (35) of the chamber, said controlling means including an electrovalve (30) and means for using the current i for supplying the electrovalve with electricity so as to control the opening of this electrovalve only when the main pilot is lit, characterized in that the electrovalve (30) is of a type such that the cycles of its openings and closings can follow one another at a relatively high frequency, on the order of a few tens of Hz, in that its openings are made dependent on the overshoot of a given threshold In by the amplitude of its supply current and in that the means for controlling this electrovalve include means (40) for adjusting at each instant the amplitude of the successive sinusoidal half waves of the current i before applying them to the electrovalve to adjust the duration of each cycle for which the said electrovalve is opened, this adjustment being effected as a function of the difference D between a reference value T of the temperature and the real temperature of the water drawn off at said instant so that the opening durations of the electrovalve and so also that of the valve membrane (33), vary in the same direction as this difference D.

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