Dual impeller

A compressor comprising:

• a dual impeller comprising:
• a hub configured to rotate about a rotation axis;
• a plurality of first blades which are disposed on a first surface of the hub along a circumferential direction of the hub;
• a first shroud which is mounted on the plurality of first blades to cover the plurality of first blades;
• a plurality of second blades which are disposed on a first surface of the first shroud along a circumferential direction of the first shroud;
• a second shroud which is mounted on the plurality of second blades to cover the plurality of second blades;
• a plurality of first flow paths defined by the hub, the plurality of first blades, and the first shroud;
• and
• a plurality of second flow paths defined by the first shroud, the plurality of second blades, and the second shroud,
• wherein a first angle formed between adjacent first blades, with the rotation axis as a vertex of the first angle, is smaller than a second angle formed between adjacent second blades, with the rotation axis as a vertex of the second angle,
• wherein inlets of the plurality of first flow paths and inlets of the plurality of second flow paths are disposed at an end of the hub,
• wherein outlets of the plurality of first flow paths and outlets of the plurality of second flow paths are open in a radial direction of the dual impeller,
• wherein first ends of the plurality of first blades and the plurality of second blades are located at the inlets of the plurality of first flow paths and the inlets of the plurality of second flow paths, respectively,
• wherein second ends of the plurality of first blades and the plurality of second blades, that are opposite the first ends, comprise tips that are located at the outlets of the plurality of first flow paths and the outlets of the plurality of second flow paths, respectively,
• wherein the tips of the plurality of first blades and the plurality of second blades face the radial direction of the dual impeller, and
• wherein the compressor further comprises:
• a diffuser connected to the outlets of the plurality of first flow paths and the outlets of the plurality of second flow paths;
• and
• a scroll connected to the diffuser such that fluid from the first flow paths and fluid from the second flow paths is discharged to the scroll through the diffuser.