Patent ID: 7341438

Claim:
A fluid machine comprising: a stationary scroll member that includes a first base portion, and a first tooth portion extending from the first base portion in an extending direction to have a spiral shape; and a movable scroll member that includes a second base portion, and a second tooth portion extending from the second base portion in a direction opposite to the extending direction of the first tooth portion to have a spiral shape, wherein: the second tooth portion of the movable scroll member is arranged to be revolved with respect to the first tooth portion of the stationary scroll member and to form an operating chamber between the movable scroll member and the stationary scroll member, the operating chamber is changeable in accordance with a revolution of the movable scroll member to be defined between two sliding contact portions between the first and second tooth portions, and is dividable into a first operating chamber and a second operating chamber when a spiral end portion of the first tooth portion contacts a spiral end portion of the second tooth portion approximately at a center portion of the movable scroll member; the stationary scroll member has an introducing port for introducing a fluid to the operating chamber at a center portion of the stationary scroll member; the second tooth portion is provided with a passage portion through which the introducing port communicates with the second operating chamber when the introducing port communicates with the first operating chamber; the passage portion disconnects the introducing port from the second operating chamber when the introducing port is disconnected from the first operating chamber; and the volumes of the first and second operating chambers are approximately equal when the pressure in the first and second operating chambers are leveled.