Apparatus for crankcase pressure regulation using only ambient air or coolant temperature
US9050360B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Dec 27, 2010 |
| Grant date | Jun 9, 2015 |
| Priority date | — |
| Expiry date | Jun 2, 2033 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25B2700/21175
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A vapor compression thermal control system having at least one electrically powered evaporator fan and an apparatus for preventing compressor overloading apparatus having a sensor that measures temperature of air entering the evaporator. That measured temperature is compared with at least one predetermined temperature setting to activate a predetermined evaporator blower on/off duty cycle when the measured temperature exceeds the predetermined temperature. Alternatively, the apparatus can have a sensor that measures temperature of air being used to cool the condenser, and that measured temperature is then compared with at least one predetermined temperature setting to activate a predetermined evaporator blower on/off duty cycle when the measured temperature exceeds the predetermined temperature. In either case, it is evaporator air flow that is modulated when the system is operated as a heat pump. For liquid cooled evaporators, however the circulation pump instead of the fan is modulated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.