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Rotary machine

Inactive Publication Date: 2017-03-01
MITSUBISHI HEAVY IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the destabilizing force of the working fluid by the above-mentioned sealing device and impeller becomes larger than the damping force obtained by the bearing, unstable vibration occurs and the rotating shaft shakes.

Method used

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Experimental program
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Effect test

no. 1 approach

[0041] figure 1 It is a cross-sectional view showing the structure of a centrifugal compressor as an example of a rotating machine in the present embodiment. figure 2 It is an enlarged cross-sectional view showing the main part of the centrifugal compressor. image 3 It is a cross-sectional view showing a hole forming surface provided in a region of the casing facing the shroud portion of the impeller. Figure 4 It is a figure which shows the some hole formed in the hole formation surface.

[0042] like figure 1 As shown, the centrifugal compressor (rotary machine) 10 which is a rotating machine of the present embodiment mainly includes a casing 20 , a rotating shaft 30 , and an impeller 40 . The rotation shaft 30 is rotatably supported around the central axis O in the casing 20 . The impeller 40 is attached to the rotating shaft 30, and compresses the gas G that is the working fluid by centrifugal force.

[0043] The housing 20 has a structure in which a plurality of an...

no. 2 approach

[0074] Next, a second embodiment of the centrifugal compressor as an example of the rotary machine of the present invention will be described. In the second embodiment described below, since only the structure of the hole forming surface is different from that of the first embodiment, the same parts as those in the first embodiment will be described with the same reference numerals, and repeated descriptions will be omitted.

[0075] Figure 5 It is an enlarged cross-sectional view showing a main part of the centrifugal compressor in the second embodiment of the above-described rotating machine. Image 6 It is a figure which shows the some hole formed in the hole formation surface.

[0076] like Figure 5 As shown, the centrifugal compressor 10 in this embodiment includes a casing 20 , a rotating shaft 30 , and an impeller 40 .

[0077] In the centrifugal compressor 10 , a hole forming surface 60B is formed in the recessed portion 29 a formed in the impeller accommodating p...

no. 3 approach

[0086] Next, a third embodiment of the centrifugal compressor as an example of the rotary machine of the present invention will be described. In the third embodiment described below, since only the structure of the hole forming surface is different from that of the first embodiment, the same parts as those of the first embodiment are denoted by the same reference numerals, and repeated descriptions are omitted.

[0087] Figure 7 It is a cross-sectional view showing an example of the hole formed in the hole forming surface in the centrifugal compressor in the third embodiment of the rotary machine.

[0088] The centrifugal compressor 10 in this embodiment is the same as figure 1 , figure 2 The above-described first embodiment shown is provided with a casing 20 , a rotating shaft 30 , and an impeller 40 in the same manner.

[0089] In the centrifugal compressor 10 , a hole forming surface 60C is formed in the recessed portion 29 a formed in the impeller housing portion 29 o...

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PUM

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Abstract

A centrifugal compressor is provided with an impeller (40) secured to a rotary shaft (30), and a casing for accommodating the impeller (40). The impeller (40) has: a disk-shaped disk part (41); a plurality of circumferentially spaced blade parts (42); and a cover part (43) facing the disk part (41) across a space, said cover part (43) covering the plurality of blade parts (42) from one axial-direction side. The casing has a perforated surface (60A) provided in an area on the inner peripheral side relative to the outside peripheral end (43c) of the cover part (43) so as to face the cover part (43) across a space, a plurality of holes (61) being formed in the perforated surface (60A).

Description

technical field [0001] The present invention relates to rotating machines such as centrifugal compressors. [0002] This application claims priority based on Japanese Patent Application No. 2014-191015 for which it applied on September 19, 2014, and uses the content here. Background technique [0003] As one of the rotating machines, a centrifugal compressor for compressing gas is widely known. The centrifugal compressor is provided with an impeller inside the casing. The centrifugal compressor compresses the working fluid such as gas flowing in from the suction port by rotating the impeller, and discharges the working fluid from the discharge port. [0004] Rotating machines such as centrifugal compressors generally have a gap between a rotating body such as a rotating shaft and a stationary body such as a surrounding casing. Therefore, in many cases, a sealing device for suppressing the inflow of the working fluid is provided in the gap between the rotating body and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/42F04D29/66
CPCF04D17/10F04D29/0513F04D29/162F04D29/668F05D2250/283F16J15/444F04D29/053F04D29/284F04D29/4206F04D29/441
Inventor 长井直之佐藤隆
Owner MITSUBISHI HEAVY IND LTD
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