| 摘要 |
PROBLEM TO BE SOLVED: To suppress the rise of pressure loss caused by deflection of the direction of air supply, by making the shape of the cross section of the bottom of the downstream side of the intake air duct which forms a smooth air duct face in contact with the upstream face of the intake air duct a part of the circular arc. SOLUTION: For the bottom 1 of the downstream side of an air supply duct 104 connected with the upstream side of an air supply duct 104, the sectional form forms a circular arc face 2 and an adhesive face 3 being a part of the circular arc. The center of the circular arc of the cross section of the circular arc 2 lies on a straight line which connects the upstream ends of upper and lower louvers 105, and the radius of the circular arc of the circular arc face is equal to the pitch between the upper and lower louvers 105. As a result, the air being deflected downward by the upper and lower louvers 105 passes the circular arc face 2 of the bottom face 1. The supply air current 5 produces a negative pressure region 4 between itself and the adhesive face 3 lying at the downstream side of the air supply duct 104. The supply air current 5 deflects downward, being drawn by the negative pressure region 4, so it can suppress the flexion of the air current by the upper and lower louvers 105, and can suppress the rise of pressure loss. |
