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Multi-stage centrifugal compressor

A centrifugal compressor, wall technology, applied in mechanical equipment, machines/engines, liquid fuel engines, etc., can solve problems such as reduced efficiency of centrifugal compressors

Inactive Publication Date: 2021-01-05
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Such disengagement leads to a decrease in the efficiency of the centrifugal compressor, so it is desirable to suppress as much as possible

Method used

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  • Multi-stage centrifugal compressor
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  • Multi-stage centrifugal compressor

Examples

Experimental program
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Embodiment Construction

[0081] Hereinafter, several embodiments of the present invention will be described with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. .

[0082] For example, expressions such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" indicating relative or absolute configurations not only express strict Such an arrangement also means that there is a tolerance, or a state that is relatively displaced by an angle or a distance to the extent that the same function can be obtained.

[0083] For example, expressions such as "same", "equal" and "equal" that indicate the state of equality of things not only represent a state of strict equality, but also represent a state where there is a difference in the degr...

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PUM

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Abstract

The invention relates to a multi-stage centrifugal compressor, and aims to inhibit the efficiency reduction of the multi-stage centrifugal compressor. The multi-stage centrifugal compressor accordingto at least one embodiment includes: multiple stages of impellers arranged in an axial direction; a casing surrounding the impellers; and a diffuser channel for guiding a working fluid discharged fromthe impellers outward in a radial direction. In a cross-section along the axial direction, a first diffuser wall surface on a hub side of a pair of diffuser wall surfaces that are opposed in the axial direction across the diffuser channel has a retreating surface retreating toward the hub side from a connection position with a downstream end of a first upstream wall surface to a radially outer side with respect to a tangential direction of the first upstream wall surface at the downstream end of the first upstream wall surface, the first upstream wall surface being positioned upstream of thefirst diffuser wall surface and connected to the first diffuser wall surface.

Description

technical field [0001] The present invention relates to multistage centrifugal compressors. Background technique [0002] As a centrifugal compressor used in industrial compressors, turbo refrigerators, small gas turbines, pumps, etc., there is known a multistage centrifugal compressor including an impeller in which a plurality of blades are attached to a scroll fixed to a rotating shaft. . The multistage centrifugal compressor imparts pressure energy and velocity energy to the working fluid by rotating the impellers. [0003] A pair of impellers adjacent to each other in the axial direction of the rotating shaft are connected by a return flow path (for example, refer to Patent Document 1). [0004] prior art literature [0005] patent documents [0006] Patent Document 1: Japanese Patent Laid-Open No. 2018-173020 [0007] Such a multistage centrifugal compressor has a pair of axially opposed wall surfaces sandwiching the return flow path. In addition, such a multistag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D17/12F04D29/44
CPCF04D17/122F04D29/441F04D17/12
Inventor 黑田未来明连千寻
Owner MITSUBISHI HEAVY IND LTD