Welded contact safety technique
US4698978A · kind A · utility
73Cited by
4References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 26, 1986 |
| Grant date | Oct 13, 1987 |
| Priority date | — |
| Expiry date | Aug 26, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H3/001
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A bidirectional heat transfer system including a reversing valve and a compressor has a compressor control which is subject to a welded contact failure. The system is monitored to determine when the control system has signaled for the compressor operation to stop but the compressor has, in fact, continued to operate. Under these circumstances, a safety mode of operation is commenced to keep a load on the compressor to thereby save the compressor from self-destruction. Preferably, this is done by repetitively reversing the state of the reversing valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.