VENTILATION FAN FOR USE IN DUCT

• Main Author: ISHIZU TETSUO
• Format: Patent
• Language: English
• Published: 13.01.1989
• Subjects: AIR-CONDITIONING, AIR-HUMIDIFICATION, VENTILATION, USE OF AIRCURRENTS FOR SCREENING; BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; RANGES; VENTILATING; WEAPONS

PURPOSE:To remove a wasteful air flow and reduce a noise by providing a curved-face part having the same configuration as that of an imaginary cut-away part of a blast casing on the upper surface of the main body thereby to form a vent path, and further forming the upper surface corner part of the main body into a curved-face part. CONSTITUTION:A blast casing 4 has an opening 4c the upper part of which is horizontally cut and a part of which is cut away. In a main body 1, a part of the upper surface part 1a is worked into a curved-face part 8 having the same configuration as that of an imaginary cut-away part of a blast casing 4, and the curved-face part 8 which is brought into contact with an opening part 4c forms a vent path 7. Then, air sucked up through a main body suction port 1b smoothly flows without causing a phenomenon of flowing back within the main body 1 because the height of the side surface part 5 of the main body 1 is lower than the total height H of the ventilation fan for the duct, the depth of the main body 1 is shallow and the corner part 6 of the upper surface 1a is formed into a curved-face shape. Thus, sucked air is sucked through a suction port 4a and a noise is reduced.