Abstract: Provided are a maintenance method for a scroll fluid machine and a scroll fluid machine, which obviate replacement of a part of a motor unit when replacing a main body unit. In a maintenance method for replacing a main body unit 1A with a main body unit 1B on a scroll compressor including the main body unit 1A and a motor unit 2, the motor unit 2 has on a protruding portion 36 of its flange 34 an outer circumferential side fitting surface 51A and an outer circumferential side fitting surface 51B at positions different from each other in a circumferential direction, the main body unit 1A has on its main body casing 14A an inner circumferential side fitting surface 52A, which is fitted on only the fitting surface 51A, and the main body unit 1B has on its main body casing 14B an inner circumferential side fitting surface 52B to be fitted on only the fitting surface 51B.

Abstract: A compressor includes a compressor body, a motor, a current sensor that detects a current value of the motor, and a control device that controls the drive of the motor, and the control device computes, through the current sensor, a current value (I1) of the motor at a point in time when first time has elapsed from the start of the motor and a current value (I2) of the motor at a point in time when second time longer than the first time has elapsed from the start of the motor, and makes a notification in a different mode.

Abstract: There is provided a compressor including: a piston that reciprocates inside a cylinder; a valve plate that closes an end portion of the cylinder; a connecting rod that supports the piston; a crankshaft that applies a rotating force to an end portion of the connecting rod; and a crankcase that rotatably supports the crankshaft. The piston is an oscillating piston that reciprocates while oscillating inside the cylinder according to rotation of the crankshaft. An outer peripheral surface of the piston is a curved surface.

Abstract: There is provided a compressor including: a piston that reciprocates inside a cylinder; a valve plate that closes an end portion of the cylinder; a connecting rod that supports the piston; a crankshaft that applies a rotating force to an end portion of the connecting rod; and a crankcase that rotatably supports the crankshaft. The piston is an oscillating piston that reciprocates while oscillating inside the cylinder according to rotation of the crankshaft. An outer peripheral surface of the piston is a curved surface.

Abstract: There is provided a compressor including: a piston that reciprocates inside a cylinder; a valve plate that closes an end portion of the cylinder; a connecting rod that supports the piston; a crankshaft that applies a rotating force to an end portion of the connecting rod; and a crankcase that rotatably supports the crankshaft. The piston is an oscillating piston that reciprocates while oscillating inside the cylinder according to rotation of the crankshaft. A central axis of an inner diameter of the cylinder is disposed at a position shifted by an offset amount e with respect to a rotation center axis of the crankshaft. An upper surface of the piston is substantially parallel to a crankcase side surface of the valve plate in a state where the piston is at a top dead center.

Abstract: A first tank, a main body of a compressor, an electric motor, and a second tank are combined to form a single assembly. A booster type air compressor as the single assembly including the first tank may be easily carried. The first tank at an inlet side is integrally combined to prevent a pulsation in the supplied compressed air for eliminating the drain contained in the compressed air. The air compressor, thus, is structured to discharge high compressed air from a high-pressure outlet joint formed on the second tank.