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Impeller and rotary machine

A technology of rotating machinery and impellers, which is applied in the field of flow path shape, can solve the problems of flow loss and performance degradation on the small flow side, and achieve the effect of reducing flow loss

Inactive Publication Date: 2012-02-29
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Then, the block k of the low-energy fluid gradually expands toward the outlet 207, thereby causing a flow loss from the rear half 211 of the fluid flow path 210 on the outlet 207 side to the outlet 207.
[0010] In addition, since the block k of the low-energy fluid becomes larger as the flow rate decreases, it is also a factor that reduces the performance on the small flow rate side.

Method used

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Embodiment Construction

[0049] Hereinafter, an impeller and a rotary machine according to embodiments of the present invention will be described with reference to the drawings. The impeller of this embodiment will be described by taking an impeller of a rotary machine, that is, a centrifugal compressor, as an example.

[0050] The centrifugal compressor 100 that is the rotary machine of the present embodiment is, for example, figure 1 As shown, mainly by the shaft 102 rotating around the axis O, the impeller 1 installed on the shaft 102 and compressing the process gas (gas) G by centrifugal force, the shaft 102 can be supported so as to be rotatable and formed to make the process gas G flow from the upstream The cover 105 of the channel 104 that flows sideways to the downstream side constitutes it.

[0051]The cover 105 is formed so that the outer contour becomes substantially cylindrical, and the shaft 102 is arrange|positioned so that it may pass through the center. A journal bearing 105a is pro...

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Abstract

Disclosed is an impeller, which is in a rotary machine, and wherein the direction of flow gradually changes from the axial direction to the radial direction while flowing from the inner side in the radial direction to the outer side in the radial direction of fluid ducts. The impeller is provided with hub surfaces, which configure at least one part of the aforementioned fluid ducts; vane surfaces, which configure at least one part of the aforementioned fluid ducts; and bulges, which bulge toward the inside of the aforementioned fluid ducts at the corners located where the aforementioned hub surfaces contact the aforementioned vane surfaces at the latter halves, which are the latter halves towards the outlets as opposed to the former halves towards the inlets of the aforementioned fluid ducts.

Description

technical field [0001] The present invention relates to an impeller and a rotary machine, and particularly relates to the shape of its flow path. Background technique [0002] In industrial compressors, centrifugal or mixed-flow compressors used in rotary machines such as turbo refrigerators and small gas turbines, performance improvement is required, and in particular, the performance of the impeller, which is a key component of these compressors, needs to be improved. Therefore, in recent years, in order to improve the performance of the impeller, an impeller is proposed that effectively suppresses secondary flow and separation by providing a concave portion at the leading edge between the tip of the blade and the hub (for example, refer to Patent Document 1). [0003] In addition, in order to improve the performance of the centrifugal or diagonal flow impeller, a plurality of grooves are formed on the hub surface between the blades so that the boundary layer of the flow a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/30F04D29/24F04D29/68
CPCF04D29/24F04D29/30F04D29/284F04D29/68F04D29/281
Inventor 枡谷穰
Owner MITSUBISHI HEAVY IND LTD