Heat pump air conditioner
US6314750A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 2000 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | May 8, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25B2700/04
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A heat pump air conditioner has a heat exchanger, a separator for separating refrigerant discharged from the heat exchanger into gas refrigerant and liquid refrigerant, and a compressor. Gas refrigerant in the separator is sucked into the compressor through a gas suction pipe. Oil-dissolved liquid refrigerant in the separator is also sucked through an oil return hole formed at a bottom of the gas suction pipe into the compressor. At the time of starting the air conditioner, when it is judged that a surface of liquid refrigerant in the separator is rapidly lowered to the oil return hole, a rotational speed of the compressor is controlled so that an amount of refrigerant discharged from the compressor is decreased. As a result, the surface of liquid refrigerant is kept higher than the oil return hole, and oil shortage of the compressor is restricted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.