Air flow control system having minimum variation in volume
US4552058A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1983 |
| Grant date | Nov 12, 1985 |
| Priority date | — |
| Expiry date | Nov 21, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F8/108
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
An air volume control ventilation system which minimizes variation in air volume flowing through the system has a fan for drawing air through fixed-resistance filter means including a roll filter, an electrostatic filter, and a high efficiency filter; a variable-resistance volume control damper operated, when an actuator therefor is energized in opposite directions, to open and to close and thus vary the volume of air flowing through the system; and a differential static pressure switch connected across the fan and being provided with a normally open high limit set of contacts adapted to close and complete a circuit to open the damper when the differential pressure across the switch rises to a first predetermined limit and also a low limit set of normally open contacts adapted to close and complete a circuit to shut the damper when the differential pressure falls below a second predetermined limit, whereby the damper is alternately open and shut and the differential pressure across the fan is maintained within a narrow band between the first and second limits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.