| 摘要 |
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. |
| 主权项 |
1. 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,
wherein the centrifugal compressor has a centrifugal impeller fastened to a shaft, and the centrifugal impeller has a hub and a plurality of blades provided at intervals in a circumferential direction of the hub, and wherein blade angle distribution of the blade is configured such that, when a hub side camber line connecting a hub side leading edge as a suction side end and a hub side trailing edge as a discharge side end of the blade is indicated with a lateral axis, and a hub side blade angle of the blade is indicated with a vertical axis, a hub side blade angle is maximum on a side closer to the hub side leading edge than a central point of the hub side camber line, and from a part where the blade angle is maximum to the hub side leading edge, a hub side blade angle distribution curve indicating the hub side blade angle distribution is convex in a blade angle increasing direction, and configured such that, when a counter-hub side camber line connecting a counter-hub side leading edge as a suction side end on a counter-hub side and a counter-hub side trailing edge as a discharge side end of the blade is indicated with the lateral axis and a counter-hub side blade angle of the blade is indicated with the vertical axis, the counter-hub side blade angle is minimum at the counter-hub side leading edge of the counter-hub side camber line, or on a side closer to the counter-hub side leading edge than a central point of the counter-hub side camber line, further configured such that, in an arbitrary section including a part where the blade angle is minimum in a counter-hub side blade angle distribution curve indicating the counter-hub side blade angle distribution, the counter-hub side blade angle distribution curve is convex in a small blade angle direction, and from a 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. |
