US 4,952,122 AGranted

Fluid compressor

AssigneeKabushiki Kaisha Toshiba

InventorsToshikatsu Iida, Takayoshi Fujiwara

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Abstract

A fluid compressor includes a cylindrical casing, a cylinder arranged in the casing to be rotatable and coaxial with the casing, and a columnar rotary body located in the cylinder and extending in the axial direction of the cylinder. A spiral groove is formed on the outer circumferential surface of the rotating body. A spiral blade is fitted into the groove and divides the space between the inner circumferential surface and the outer circumferential surface into a plurality of operating chambers which have volumes gradually decreasing with a distance from one end of the cylinder. When the cylinder and rotary body are relatively rotated by a motor section, a fluid, introduced into the one end of the cylinder, is transferred toward the other end of the cylinder through the operating chambers and compressed during the transfer. The motor section includes an annular stator fixed to the outer circumferential surface of the casing, and a rotor located within the casing and fixed to the outer circumferential surfaces of the cylinder to be coaxial with the casing.

Claims6

Dependent claims

A fluid compressor comprising:

a substantially cylindrical casing;
a cylinder having a suction end and a discharge end and arranged rotatably in said casing;
a columnar rotary body located in the cylinder to extend in the axial direction thereof and be eccentric thereto, and rotatable relative to the cylinder while part of the rotary body is in contact with the inner circumferential surface of the cylinder, said rotary body having a spiral groove formed on the outer circumferential surface thereof, said groove having pitches narrowed gradually with a distance from the suction end toward the discharge end of said cylinder;
a spiral blade fitted in the groove to be slidable, substantially in the radial direction of the rotary body, having an outer surface in tight contact with the inner circumferential surface of the cylinder, and dividing the space between the inner circumferential surface of the cylinder and the outer circumferential surface of the rotary body into a plurality of operating chambers;
and
drive means, including a stator fixed to the outer periphery of the casing and a rotor located within the casing and fixed to the cylinder, for rotating the cylinder and the rotary body to sequentially transport a fluid, drawn in the cylinder through the suction end thereof, through the operating chambers to the discharge end of the cylinder.

3 more elements

Dependencies are inferred from the claim text.