GAS COMPRESSOR

摘要

In a gas compressor, an outline shape of an inner peripheral surface (41) of a cylinder (40) is set such that in a point before a compression chamber (43B) adjacent to a compression chamber (43A) in the upstream side in the rotational direction (W) is exposed to a discharge hole (45b) of a primary discharge portion (45) with rotation of a rotor (50) in the rotational direction (W) (point where the compression chamber (43B) is positioned upstream of an angular position of being exposed to the discharge hole (45b) of the primary discharge portion (45)), a pressure of the refrigerant gas (G) inside the compression chamber (43) reaches a discharge pressure. Therefore the discharge hole (45b) of the primary discharge portion (45) always discharges a refrigerant gas (G) from the compression chamber (43) to prevent generation of the discharge pulsation.

主权项

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 outward of an outer peripheral surface of the rotor, and is provided with a discharge portion for, when a pressure of the gas inside the 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 that are provided to be able 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; the outline shape of the inner peripheral surface is set such that each compression chamber performs suction and compression of the gas, and discharge of the gas from the discharge portion by only one cycle during a period of one rotation of the rotor and a pressure of the gas inside the compression chamber reaches the discharge pressure in a point before the compression chamber is exposed to the discharge portion with rotation of the rotor; and when the pressure of the gas inside the compression chamber reaches the discharge pressure, one or more secondary discharge portions that discharge the gas inside the compression chamber are formed in the upstream side of the discharge portion in the rotational direction of the rotor.