Fluid compressor having a horizontal rotation axis

A fluid compressor having a horizontal rotation axis comprising:

• a sealed casing;
• an oil reservoir, formed at an inner bottom portion of the sealed casing, for receiving a lubrication oil;
• a rotor situation within the sealed casing and supported with its axis situation horizontally, in parallel to the level of the lubrication oil in the oil reservoir at a predetermined distance kept between the rotor and the level of the lubrication oil;
• a motor unit, provided on the rotor, for rotating the rotor;
• a compression mechanism, providing on the rotor, for sucking, compressing and discharging a fluid to be compressed, in accordance with the rotation of the rotor;
• and
• oil supply means, provided on the rotor, for sucking the lubrication oil from the oil reservoir by utilizing a torque of the rotor as a driving force, and forcefully supplying the lubrication oil to a discharge-side slide portion of the compression mechanism
• said compression mechanism comprising:
• a cylinder having open end portions rotatably supported by bearings;
• a rotor piston situation within the cylinder and having end shaft portions rotatably supported by the bearings with an eccentricity to the cylinder;
• a blade helically wound around the outer periphery of the rotor piston, the blade being able to project from and retreat in the periphery of the rotor piston;
• and
• driving means for coupling the cylinder and the rotor piston, rotating together the cylinder and the rotor piston, taking the fluid to be compressed into a working space defined by the cylinder, the rotor piston and the blade, and successively conveying and compressing the fluid,
• said oil supply means being provided on the at least one of the shaft portions of the rotor piston, within at least one of the bearings supporting the shaft portions,
• said oil supply means comprising:
• at least one winding portion adjoining the shaft portion of the rotor piston;
• at least one support hole for supporting the shaft portion of the rotor piston within at least one of the bearings, the support hole adjoining the winding portion;
• an eccentric support portion being eccentric to the center axis of the support hole, and having an eccentric chamber being defined between the periphery of the shaft portion and the inner cavity of the bearing;
• a helical portion wound around the winding portion of the rotor piston, being able to project from and retreat in the periphery of the winding portion, projecting to the eccentric chamber, and being rotatable with the winding portion as one unit;
• and
• an oil suck-up path having one opening end portion, which is open to the eccentric chamber, and the other opening end portion, which is immersed in the lubrication oil in the oil reservoir,
• wherein in accordance with the rotation of the shaft portion, the helical portion is rotated, and the lubrication oil is sucked up through the oil suck-up path, led to the eccentric chamber and forcefully supplied to the compression mechanism.