Patent ID: 8757964

Claim:
A scroll structure of a rotary machine, comprising: a scroll main body that entirely covers an area surrounding an annular channel extending in a circular shape about a rotational axis in a rotating portion of the rotary machine and a cylindrical channel extending from the annular channel and extending towards the rotating portion; a casing constituting an outer shape of the rotary machine and accommodating the scroll main body therein; and a fitting portion that supports the scroll main body with respect to a support portion, so as to enable expansion and contraction of the scroll main body in a radial direction centered on the rotational axis, wherein the fitting portion includes: a turbine portion-side restraining portion that restrains movement of the scroll main body along the rotational axis, with respect to the support portion, and a casing-side restraining portion that restrains movement of the scroll main body along the rotational axis, with respect to the support portion, wherein each of the turbine portion-side restraining portion and the casing-side restraining portion comprises: a ring which is provided on the scroll main body, a ring which is provided on the support portion, protrusions which are disposed on the ring on the scroll main body, and which protrude in a radial direction; a groove which is disposed on the ring which is provided on the support portion, the groove being open in the radial direction and into which the protrusions are fitted, and depressions which are formed in the ring which is provided on the support portion and which are formed in one wall of a pair of wall portions defining the groove and through which the protrusions pass by moving relative to the one wall, along the rotational axis, and wherein the turbine portion-side restraining portion and the casing-side restraining portion are disposed on opposite sides of the cylindrical channel.