Automatic temperature and humidity regulation – Mixing fluid of dissimilar temperature – Mixing valve with temperature motive means
Patent
1998-07-24
2000-09-19
Wayner, William
Automatic temperature and humidity regulation
Mixing fluid of dissimilar temperature
Mixing valve with temperature motive means
13762541, 236 94, G05D 2313, E03B 3100
Patent
active
061199486
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a system for drawing off service water from draw-off points such as washbasins or the like, where it is intended that cold, hot or warm water be available.
At the draw-off point, the desired amount of water at the desired temperature is set via a fitting, which in modern houses is often designed as a single-lever mixer fitting, via a rotary/pivoting movement of the lever. The temperature of the mixed warm water is determined by the rotary movement of the lever and is based on the experience of the user, since the temperature is primarily dependent on the temperature of the hot water that is available. In principle, therefore, there is the risk that the individual operating the fitting will be scalded.
In order to avoid scalding, DE 33 28 782 C3 discloses a device for measuring and indicating the temperature of the water flowing through the outlet of a sanitary fitting. The fitting is provided with a visible indicator which outputs a striking visual signal when a water temperature corresponding to the scalding limit is exceeded. To this end, a signal output by a temperature sensor and relating to the actual water temperature is compared electronically with the nominal temperature. A similar device is described in DE 35 13 549 C2.
Depending on the duration of the interruption between individual draw-off operations at a draw-off point, warm water at the desired temperature is not immediately available at the draw-off point after the fitting is opened. Depending on the duration of the interruption and the distance of the draw-off point from the warm water store, a certain time interval elapses until the water that has cooled down in the meantime in the hot water line is replaced by hot water. What flows initially is, therefore, cold or lukewarm water, which can suddenly become hot. In the known systems, it is therefore disadvantageous that, although the actual temperature is determined and a visual warning is also given when the scalding limit is reached, the warning signal is given just immediately before the point in time at which the individual operating the fitting himself notices that the water being drawn off is becoming too hot. In order to counteract the risk of scalding, either the user must continuously keep the indicating device in sight, or the nominal temperature must be set so low that the warning is given in good time. However, here too, the visual warning is always coupled with the personal temperature sensitivity of the user, so that it is basically not necessary. In addition, before water is drawn off each time, either the desired nominal temperature must be set, which is quite complicated, or a nominal value must be set permanently. The individual setting of the nominal value for each draw-off operation is of course laborious and time-consuming, so that such a system finds only little acceptance with the consumer.
Based on this presentation of the problem, the water draw-off system is to be improved in such a way that water at the respectively individually desired temperature can be drawn off at the draw-off point in a simple way, and scalding is ruled out, given correct setting of the nominal temperature.
The solution to the problem is given by a water draw-off system having a hot water feed line and a cold water feed line, a mixing device for mixing hot water and cold water in an adjustable ratio, having a water draw-off device, which is connected to a temperature measuring device and in which an indicating element is integrated and indicates an adjustable nominal temperature, the actual temperature of the desired water being compared in the temperature measuring device with the set nominal temperature, in that the nominal temperature is adjustable via the draw-off device and the mixing device is provided with an external drive via which the ratio of hot and cold water is regulated according to the deviation of the actual temperature from the nominal temperature.
In this system, by contrast with conventional systems, the mixing device is separated from the draw-off
REFERENCES:
patent: 2069040 (1937-01-01), Lodder
patent: 3721386 (1973-03-01), Brick et al.
patent: 4630940 (1986-12-01), Ostertag
patent: 4682626 (1987-07-01), Bergmann
patent: 5174495 (1992-12-01), Eichholz
patent: 5400961 (1995-03-01), Tsutsui et al.
Boehm Robert
Spiegel Herbert
Hage Fittings GmbH & Co. KG
Wayner William
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