Electrically controlled fluid mixing fixture, especially for mixing hot and cold water
US4921162A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1989 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | Apr 24, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/2499
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In the fluid mixing fixture, a displacement body and a tubular shell, which coaxially encloses the displacement body, are arranged at an inflow element. A temperature measuring element, such as a nickel wire which is covered by a plastic jacket, is wound around the tubular shell at the region of an annular gap formed between the displacement body and the tubular shell. Hot water and cold water flow through inflow openings of the inflow element and into a recess or chamber thereof, at that location the hot water and cold water are admixed and then the admixed water flows through the annular gap to an outflow opening. Since the flow cross-sectional area of the annular gap is smaller than the inflow cross-sectional area of the inflow openings the velocity of the admixed water is increased. This promotes further admixing of the hot and cold water and enhances heat transfer to the tubular shell. A radial temperature gradient cannot develop in the annular gap, so that the temperature of the water can be measured extremely accurately. Measurement of the water temperature is accomplished very close to the location of intermixing of the hot and cold water, allowing exceedingly rapid detecti…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.