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US 2025/0020130 A1Published application
Centrifugal compressor and refrigeration apparatus
AssigneeDaikin Industries, Ltd.
InventorsArihiro IWATA, Kosuke NISHIMURA, Koichi TANAKA, Daigo FUKUDA, Yuki KAWACHIYA
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Abstract
A casing of a centrifugal compressor has a first wall facing a back surface of an impeller. A back gap is formed between the back surface of the impeller and the first wall. A specific speed of the impeller is set to be less than 0.1. A ratio of an axial width s of the back gap to an impeller radius r satisfies a relationship of 0.008≤s/r≤0.5, where the axial width s is a width of the back gap in an axial direction of the shaft, and the impeller radius r is a radius of the impeller.
Claims20
A centrifugal compressor comprising:
- a casing;
- an impeller housed in the casing;
- and
- a shaft coupled to the impeller,
- the casing having a wall facing a back surface of the impeller,
- the shaft being inserted into an insertion hole formed in the wall,
- a back gap being formed between the back surface of the impeller and the wall, wherein
- a specific speed of the impeller is set to be less than 0.1, and
- a ratio of an axial width s of the back gap to an impeller radius r satisfies a relationship of 0.008≤s/r≤0.5, where the axial width s is a width of the back gap in an axial direction of the shaft, and the impeller radius r is a radius of the impeller.
6 more elements
Dependencies are inferred from the claim text.