| 摘要 |
An ionization smoke detector is provided with a ventilated sensing chamber and housing which cooperate to improve and control smoke sensitivity by reducing adverse effects of external winds or drafts. The detector includes a housing having arcuate openings arranged in a circle and a flared deflector mounted within the circle in order to direct smoke and other particulate matter into the interior of the housing. A smoke sensing chamber is positioned within the housing adjacent the openings and has a cylindrical shell electrode defining arcuate ventilating apertures registering with the arcuate openings of the housing to pass smoke and particulate matter in and out of the chamber in cooperation with the flared deflector. The shell electrode and the housing cooperate to control the flow of smoke through the chamber and thereby improve smoke sensitivity.
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