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AssigneeHitachi, Ltd.
InventorsHiromi KOBAYASHI, Kiyotaka HIRADATE, Kazuyuki SUGIMURA, Toshio ITO, Hideo NISHIDA
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A centrifugal compressor 200 used in a gas pipeline 1 has a centrifugal impeller provided with a hub and a plurality of blades. The blade angle distribution of the blade is configured such that a hub side blade angle is maximum on the side closer to a hub side leading edge than a central point of a hub side camber line, and from this part to the hub side leading edge, a hub side blade angle distribution curve is convex in a blade angle increasing direction. Further, the blade angle distribution is configured such that a counter-hub side blade angle is minimum at a counter-hub side leading edge of the counter-hub side camber line, or on the side closer to the counter-hub side leading edge than a central point of a counter-hub side camber line, and in an arbitrary section of the counter-hub side blade angle distribution curve including a part where the blade angle is minimum, the counter-hub side blade angle distribution curve is convex in a small blade angle direction, and in a section from the downstream side of the section where the counter-hub side blade angle distribution curve is convex to the counter-hub side trailing edge, the counter-hub side blade angle distribution curve is convex in a large blade angle direction. With this arrangement, it is possible to obtain a gas pipeline centrifugal compressor in which the low flow-rate side operating range is expanded and a high flow-rate side operating range is maintained.
A gas pipeline centrifugal compressor used in a gas pipeline having gas piping to transfer gas and a plurality of compressors for gas pressurization provided on a route of the gas piping,
Dependencies are inferred from the claim text.