Photoelectric smoke detector having double-bulkhead darkroom structure

A photoelectric smoke detector having a double-bulkhead structure, the photoelectric smoke detector comprising:

• a base which has, at one side thereof, a light emitting element receiving part in which a light emitting element for emitting light into the base is mounted, and has, at the other side thereof, a light receiving element receiving part in which a light receiving element for receiving light, which is emitted by the light emitting element and scattered by smoke particles, is mounted;
• an outer bulkhead which protrudes downward from the base to define an outer wall of the smoke detector, and has a smoke inlet that is formed in a circumferential direction and has a particular height;
• a lower end surface which is coupled to a lower end of the outer bulkhead;
• and
• an inner bulkhead which protrudes upward from the lower end surface, is disposed to be spaced apart from the outer bulkhead at a particular interval, and has a height smaller than a height of the outer bulkhead to define a gas flow region at an upper side thereof,
• wherein smoke is introduced through the smoke inlet and introduced through a space between the outer bulkhead and the inner bulkhead, and the gas flow region;
• an internal flow guide portion connected inward to an upper end surface of the outer bulkhead;
• a first guide portion which protrudes outward from an upper end of the inlet;
• a second guide portion which protrudes outward from a lower end of the inlet;
• wherein a lower surface of the first guide portion and an upper surface of the second guide portion are formed as curved surfaces to guide an inflow of smoke into the inlet;
• wherein an edge portion, which is connected to the outer bulkhead and the internal flow guide portion, and an upper end surface of the inner bulkhead are rounding-processed at a particular curvature;
• wherein a particular space between the outer bulkhead and the inner bulkhead is 0.3 to 0.6 of a radius of the smoke detector.