Rotor assembly, compressor and air conditioner

A compressor, comprising:

• a housing comprising a first inner wall;
• and
• a rotor assembly comprising:
• a first bearing housing including the first inner wall,
• a first rotor having a first end face;
• and
• a clearance fit space formed between the first inner wall and the entire first end face, the first rotor comprising:
• a first working portion and a second working portion coaxially arranged in the housing, the first working portion and the second working portion are rotatable about a first axis and have opposite helical axis, the first working portion includes:
• a plurality of first helical blades,
• a first blade groove is formed between adjacent two of the plurality of first helical blades, and
• at least one first air pressure groove is provided on the first end face of the first working portion away from the second working portion, and the first air pressure groove sucks gas from the first blade groove that fills the at least one first air pressure groove so as to pressurize the first air pressure groove, and the pressurized at least one first air pressure groove further forms a layer of pressurized gas film in the clearance fit space along the entire first end face,
• wherein the pressurized at least one first air pressure groove is configured to form a force towards the second working portion along the first axis when the first rotor rotates,
• wherein the layer of pressurized gas film is configured to prevent the first working portion of the first rotor from having engaged abutting contact against the first inner wall of the first bearing housing, and
• wherein the at least one first air pressure groove is arcuate with a wide base adjacent to the first respective blade groove and tapers to a point.