| 摘要 |
An air control system for removing heat, smoke and steam from above a cooking appliance 3 comprises an air extraction assembly comprising an extraction fan 7 drawing air through an extraction hood 2, detecting at least one variable parameter including at least temperature via at least one sensor 9, 10, 14a, 15, 16, a control device controlling the speed of the fan 7 depending on the detected temperature 9, and a override module that increases the speed of the fan 7 to a maximum value when at least one of the variable parameters reaches a threshold value. Sensors for other variable parameters include laser optic sensors 10 detecting smoke or stream, and carbon dioxide, carbon monoxide and cooking gas sensors 14a, 15, 16. The control device may comprise of a sensor processor 17 receiving data from the sensors 9, 10, 14a, 15, 16 and a display 18 displaying the status of the system. An override switch actuated by a user may enable the fan 7 to operate at maximum speed. Air may be supplied by a supply fan 4. Flow rate from fans 4, 7 may be detected by flow meters 13a, 13b and used to control the speed of the fans 4, 7 and supply energy to the cooking appliance 3. An alarm 26, 27 may be provided. If the detected temperature 9 reaches even higher value a fire suppression system 29 may be initiated. |
