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Centrifugal compressor and manufacturing method for impeller

A centrifugal compressor and impeller technology, applied in mechanical equipment, machines/engines, liquid fuel engines, etc., can solve the problems of reduced impeller efficiency or performance, reduced compressor efficiency, reduced flow range, etc. The effect of reduced variation and increased flow range

Inactive Publication Date: 2008-07-30
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, a large shock wave will be generated here, which will reduce the efficiency or performance of the impeller, reduce the efficiency of the compressor itself, and reduce the flow range that can operate stably.

Method used

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  • Centrifugal compressor and manufacturing method for impeller
  • Centrifugal compressor and manufacturing method for impeller
  • Centrifugal compressor and manufacturing method for impeller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] figure 1 It is a sectional view of main parts of the centrifugal compressor of Embodiment 1 of the present invention, figure 2 yes figure 1 II-II sectional view, image 3 yes figure 1 Section III-III, Figure 4 is a schematic diagram of the impeller of the centrifugal compressor of Embodiment 1, Figure 5 It is a schematic diagram showing the manufacturing method of the impeller of the centrifugal compressor of Example 1, Image 6 It is a schematic diagram showing the processing procedure of the impeller, Figure 7 It is a schematic diagram showing the shape of the central part of the blade of the impeller of Example 1, Figure 8 It is a graph showing the flow rate per unit area corresponding to the relative inflow velocity of the fluid in the centrifugal compressor of Example 1.

[0063] The centrifugal compressor of this embodiment is as Figure 1 to Figure 4 As shown, an impeller 11 is rotatably supported by a rotating shaft 12 in a casing (not shown), an...

Embodiment 2

[0075] Figure 9 It is a sectional view of main parts of a centrifugal compressor according to Embodiment 2 of the present invention, Figure 10 yes Figure 9 The X-X profile, Figure 11 is a schematic diagram of the impeller of the centrifugal compressor of Embodiment 2, Figure 12 It is a schematic diagram showing the manufacturing method of the impeller of the centrifugal compressor of the second embodiment. In addition, the same symbols are used for members having the same functions as those described in the above-mentioned embodiments, and overlapping descriptions will be omitted.

[0076] In the centrifugal compressor of embodiment 2, such as Figure 9 to Figure 11 As shown, the impeller 31 has a plurality of blades 34 radially fixed to the outer peripheral portion of a hub 33 fixed to the rotating shaft 32 . On the negative pressure surface of the vane 34 of the impeller 31, a convex portion 35 is formed in a curve (arc shape) from the front edge portion A to the s...

Embodiment 13

[0083] Figure 13 It is a cross-sectional view of an impeller of a centrifugal compressor according to Embodiment 3 of the present invention. In addition, the same symbols are used for components having the same functions as those described in the above-mentioned embodiments, and overlapping descriptions will be omitted.

[0084] In the centrifugal compressor of the present embodiment, as Figure 13 As shown, the impeller 41 is constituted by making the hub side concave when using either the convex portion 17 of the impeller 11 of the first embodiment or the peak-shaped convex portion 35 of the impeller 31 of the second embodiment. That is, in the impeller 41 of the present embodiment, the convex portion 17 is formed so as to gradually become convex from the negative pressure surface of the impeller 16 toward the slit portion, or on the negative pressure surface of the blade 34, the convex portion 17 is gradually formed from the leading edge portion to the slit portion. The ...

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Abstract

A centrifugal compressor and a method of manufacturing an impeller, the method wherein a projected part (17) is formed at the approximately radial center part of the impeller (11) on the negative pressure surface side of its a blade (16) so as to form a curve from the leading edge part (A) to the throat part (B) thereof. The projected part (17) is formed to be curved and then to be flat from the throat part (B) to the trailing edge part thereof. The projected part (17) is formed at a position where the relative inflow velocity of the fluid into the impeller (11) is nearly 1 in Mach number Ma. Thus, since an operating efficiency can be increased and an applicable flow range can be increased, the performance of the impeller can be increased.

Description

technical field [0001] The present invention relates to a centrifugal compressor for pressurizing fluid to form compressed fluid, in particular to an impeller for pressurizing fluid and a manufacturing method of the impeller. Background technique [0002] Figure 20 It is a cross-sectional view of an impeller of a conventional centrifugal compressor, Figure 21 yes Figure 20 XXI-XXI sectional view, Figure 22 It is a schematic diagram showing the shape of each position of the blade of the conventional impeller, Figure 23 It is a graph showing the flow rate per unit area corresponding to the relative inflow velocity of fluid in a conventional centrifugal compressor. [0003] In a general centrifugal compressor, an impeller having a plurality of blades is rotatably supported in a casing, and a suction passage in the axial direction is formed with respect to the impeller, and a diffuser in the radial direction is formed. Therefore, when the impeller is rotated by a motor n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/30
Inventor 东森弘高
Owner MITSUBISHI HEAVY IND LTD
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