Heat-pump-type vehicle air conditioning system and defrosting method thereof
US10040336B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 2014 |
| Grant date | Aug 7, 2018 |
| Priority date | — |
| Expiry date | Sep 18, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25B2400/0411
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A heat pump vehicle air conditioning system passes hot gas to a condenser and a vaporizer for the vehicle cabin exterior. Even with low outside air temperature, it can efficiently defrost using the cooling cycle. The system includes a cabin-interior condenser downstream of a cabin-interior vaporizer within an HVAC unit connected via refrigerant switching means to a cooling cycle. Cooling is accomplished by a compressor, cabin-exterior condenser, first decompression unit with on-off valve function, the cabin-interior vaporizer, and an accumulator. A cabin-exterior vaporizer disposed outside of the vehicle cabin is connected with a second decompression unit via an on-off valve function and to the exit-side liquid refrigerant pipe of the cabin-exterior condenser. A bypass circuit having a third decompression unit with on-off function is connected between the accumulator and the exit-side liquid refrigerant pipe of the cabin-exterior condenser.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.