Centrifugal compressor with surge control
AssigneeDaikin Applied Americas Inc.
InventorsMd Anwar Hossain, Nobuhiro Umeda, Takatoshi Takigawa
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Abstract
A centrifugal compressor for a chiller includes a casing, an inlet guide vane, an impeller downstream of the inlet guide vane, a motor and a diffuser. The casing has inlet and outlet portions with the inlet guide vane disposed in the inlet portion. The impeller is rotatable about a rotation axis defining an axial direction, and the impeller is adjustably mounted within the casing along the axial direction between at least a first flow rate position and a second flow rate position. The motor rotates the impeller. The diffuser is disposed in the outlet portion downstream from the impeller with a outlet port of the outlet portion being disposed between the impeller and the diffuser.
Claims12
A centrifugal compressor adapted to be used in a chiller, the centrifugal compressor comprising:
- a casing having an inlet portion and an outlet portion;
- an inlet guide vane disposed in the inlet portion;
- an impeller disposed downstream of the inlet guide vane, the impeller being rotatable about a rotation axis defining an axial direction, the impeller being a closed-face impeller that is closed between a radially inward portion of the impeller that faces the inlet guide vane and through which a fluid enters the impeller and a radially outward edge of the impeller from which the fluid exits the impeller, and the impeller being adjustably mounted within the casing along the axial direction between at least a first flow rate position and a second flow rate position, one of the first and second flow rate positions being a 100% flow rate position and the other of the first and second flow rate positions being a <100% flow rate position that is less open than the 100% flow rate position;
- a motor arranged and configured to rotate the impeller;
- and
- a diffuser disposed in the outlet portion downstream from the impeller with an outlet port of the outlet portion being disposed between the impeller and the diffuser,
- the radially outward edge of the impeller axially overlapping less of the outlet port in the <100% flow rate position than in the 100% flow rate position.
Dependencies are inferred from the claim text.