| 摘要 |
A photoelectric type fire detector has: a detector body (1); a printed circuit board (10) disposed on the upper side of the detector body (1); conductive connecting members (5) provided on the lower side of the detector body (1); terminal screws (6) for simultaneously fixing the printed circuit board (10) and the conductive connecting members (5) to the detector body (1); an optic base (40) directly placed on the upper side of the printed circuit board (10) and having a labyrinth (47) formed on the upper side thereof; fixing means (48) for fixing the optic base (40) to the upper side of the printed circuit board (10); a light-emitting element (30) and a light-receiving element (35) arranged in a pair for detecting smoke; a bug screen (46) provided on the outer periphery of the labyrinth (47) of the optic base (40); an optic base cover (50) covering the upper side of the optic base (40); and a protective cover (60) covering the printed circuit board (10), the optic base (40), the bug screen (46) and the optic base cover (50), the protective cover (60) having a plurality of smoke inlet windows (65) and provided with hooks (67) formed on the lower end thereof, the hooks (67) engaging with the detector body (1) thereby fixing the protective cover (60) to the upper side of the detector body (1). Disclosed also is a heat-photoelectric combined type fire detector in which a heat sensing element (70) connected to the printed circuit board (10) is combined with the photoelectric fire detecting function. the heat sensing element (70) being securely fixed to a protective cover of the device. <IMAGE> |
