| 摘要 |
A spiral casing device (1) for a fluid machine in which the flow area of the spiral casing (1) changes along the flow path of the spiral casing (1) and in which the spiral casing (1) is provided with an opening (22) extending radially in-wards, the spiral casing (1) being polygonal in cross section and each side being formed by a plate portion (6, 8, 10, 12, 14, 16, 18, 20), the number of sides being larger than four. |
