System and a method of automatic defrost for a refrigeration appliance
US6668566B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2002 |
| Grant date | Dec 30, 2003 |
| Priority date | — |
| Expiry date | Sep 27, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25D21/008
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A system and a method of automatic defrost for a refrigeration appliance, including a hermetic compressor driven by an electric motor (1); a control unit (2); a thermal switch means (10) having a first and a second turn on condition and a turn off condition and another turn off condition of the electric motor (1); a timer (20), which measures the periods of time in the turn on and turn off conditions of the electric motor (1); a switch means (40), which selectively interrupts the energization of the electric motor (1), by instruction of the control unit (2); and a cycle counting means (30), which counts each first and second turn on conditions of the electric motor (1), the control unit (2) selectively activating the thermal switch means (10) to operate in determined turn on and turn off conditions of the electric motor (1). The timer (20) indicates to the control unit (2) a period of time of any of the first and second turn on conditions of the electric motor (1) which is equal to the respective predetermined maximum safety values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.