Patent ID: 9316224
Filing Date: 2016-04-19
CPC Classification: F01C,F04C

Claim Text:
1. A scroll expander, comprising: a drive shaft; a drive scroll body provided integrally with the drive shaft; a driven scroll body having a rotary axis that is eccentric relative to a rotary axis of the drive shaft; an interlocking mechanism that causes the drive scroll body and the driven scroll body to rotate synchronously; a first bearing that supports the drive shaft rotatably relative to a fixed frame; and a second bearing that supports the driven scroll body rotatably relative to the fixed frame, wherein the drive scroll body includes two first end plates disposed on both sides of the driven scroll body and a spiral-shaped first wrap that projects inward respectively from the two first end plates, the driven scroll body includes a second end plate disposed between the two first end plates and a second wrap projecting from respective surfaces of the second end plate, an expansion chamber is formed on both sides of the second end plate by the end plates and the wraps of the drive scroll body and the driven scroll body, the drive shaft is comprised of a single drive shaft penetrating the expansion chamber, and the working medium introduction hole is provided in the drive shaft and is communicated with a radial direction central portion of the expansion chamber a gap that allows conjunct eccentric motion of the driven scroll body relative to the drive scroll body is formed between the second end plate of the driven scroll body and the drive shaft, and an opening of the working medium introduction hole is disposed in a position facing the gap and straddling the second end plate evenly.