Thermostatic expansion valve with electronic controller
US4944160A · kind A · utility
67Cited by
6References
4Claims
0Family size
Assignee
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Key dates
| Filing date | Jan 31, 1990 |
| Grant date | Jul 31, 1990 |
| Priority date | — |
| Expiry date | Jan 31, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B30/70
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A refrigeration system employing a mechanical thermal expansion valve with a self-heated thermistor sensing saturation temperature at a high pressure inlet and a second thermistor sensing saturation temperature at the evaporator outlet. A microprocessor based controller compares the sensed temperature with stored limits and provides output signals to a relay for cycling the condenser fan responsive to high side pressure and the compressor clutch responsive to the low pressure side temperature. For low pressure drop evaporators, the second thermistor may be disposed at the evaporator inlet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.