Patent ID: 9528514
Filing Date: 2016-12-27
CPC Classification: F01C,F04C

Claim Text:
1. A gas compressor that accommodates a compressor body inside a housing, the compressor body comprising: a substantially columnar rotor that rotates integrally with a rotary shaft; a cylinder that has an inner peripheral surface of an outline shape for surrounding the rotor from an outside of an outer peripheral surface of the rotor, and is provided with a primary discharge portion for, when a pressure of gas inside a compression chamber exposed to the inner peripheral surface reaches a discharge pressure, discharging the gas inside the compression chamber; a plurality of plate-shaped vanes provided to project toward the inner peripheral surface of the cylinder from the outer peripheral surface of the rotor; and two side blocks that close both ends of the rotor and the cylinder, wherein the vanes partition a space formed between the inner peripheral surface of the cylinder and the outer peripheral surface of the rotor to form a plurality of compression chambers; wherein the outline shape of the inner peripheral surface of the cylinder is set such that each compression chamber performs suction and compression of the gas, and discharge of the gas from the primary discharge portion by only one cycle during a period of one rotation of the rotor, wherein a proximal portion in which the inner peripheral surface of the cylinder and the outer peripheral surface of the rotor are the closest is formed in a position downstream along a rotational direction of the rotor and away from a position opposed across a rotational center of the rotor to a remote portion in which the inner peripheral surface of the cylinder and the outer peripheral surface of the rotor are the furthest apart and a pressure of the gas inside the compression chamber is configured to reach the discharge pressure in a point before the compression chamber is exposed to the primary discharge portion; wherein at least one secondary discharge portion is formed in an upstream side of the primary discharge portion in the rotational direction of the rotor and is configured to discharge the gas inside the compression chamber when the pressure of the gas inside the compression chamber reaches the discharge pressure, and wherein, in a state where the compression chamber is exposed to the primary discharge portion, the primary discharge portion is configured to always discharge the gas from the compression chamber.