| 摘要 |
PROBLEM TO BE SOLVED: To sequentially exhaust oil while storing the oil and to prevent the generation of a noise by providing oil extraction holes at both ends of a lower end of a fan casing in which ends high pressure is not operated. SOLUTION: In a Sirocco fan 1 an opening 11c is provided at a side plate 11b of a fan casing 11 in which a side plate 11b is manufactured at a barrel 11a by spot welding or the like. An opening 11d having a smaller diameter than the slide plate 11b of a rear side is provided at the plate 11b. A bell mouth 11e is mounted in the opening 11c to form a suction hole 11f, and a fan motor 11g is mounted to block the opening 11d of the plate 11b. Here in the fan 1, mounting flanges 11j are bent outward at upper edges of the body 11a and both the plates 11b, and a discharge port 11k is formed of the flanges 11j. Further, an oil extraction hole 3 is opened in a low pressure area S1 out of a high pressure area S at a lower end of the barrel 11a of the casing 11. |
