Multi-mode damper actuator
US7033268B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 2003 |
| Grant date | Apr 25, 2006 |
| Priority date | — |
| Expiry date | Apr 17, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F2013/144
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A damper actuator for a ventilation damper serves as both a control device for the ventilation damper and a fire and smoke rated device for the ventilation damper. The damper actuator includes a modulating motor controller, a two-point motor controller, and a thermal switch or switch like device that is operative to switch control of the motor from the modulating motor controller used during normal operation, to the two-point motor controller during a fire and smoke condition. The damper actuator provides an automatic and permanent disabling (by-passing) of the modulating motor controller functions the first time a pre-determined temperature level (switch point) is reached via the thermal switch or switch like device. Once the modulating motor controller is disabled, the actuator no longer supports the advanced motor control functions (i.e. the modulating control). Thereafter, the thermal switch or switch like device enables a two-point motor controller that is operative to put the damper into either a fully open or a fully closed position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.