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Sealing device and rotating machine

A technology of sealing device and rotating body, which is applied in the direction of mechanical equipment, engine sealing, liquid variable capacity machinery, etc., can solve the problems of insufficient eddy current reduction and increased leakage of seals, etc., to suppress the increase and realize the leakage , The effect of improving the running performance

Inactive Publication Date: 2015-07-29
MITSUBISHI HEAVY INDUSTIES COMPRESSOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these methods, problems such as insufficient reduction of eddy current or increase in seal differential pressure and increase in seal leakage amount occur.

Method used

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  • Sealing device and rotating machine
  • Sealing device and rotating machine
  • Sealing device and rotating machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0051] Hereinafter, the sealing device and the rotary machine according to the embodiment of the present invention will be described.

[0052] figure 1 A centrifugal compressor 1 as a rotary machine according to the present embodiment is shown.

[0053] The centrifugal compressor 1 includes a rotary shaft 2 that rotates around an axis O. As shown in FIG. A plurality of impellers 3 that compress process gas (fluid) G by centrifugal force are attached to the rotating shaft 2 . In addition, the centrifugal compressor 1 includes a casing 5 including a flow path 4 through which the process gas G flows from the low-pressure side to the high-pressure side.

[0054] A shaft seal device 5a, a journal bearing 5b, and a thrust bearing 5c ​​are provided at both end portions of the housing 5 in the direction of the axis O. Both ends of the rotating shaft 2 are rotatably supported by the housing 5 via journal bearings 5b.

[0055] The impeller 3 of the centrifugal compressor 1 in the pr...

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PUM

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Abstract

Provided is a sealing device that has a seal rotation body, and a seal stationary body disposed so as to have a gap in the radial direction with respect to the outer peripheral surface of the seal rotation body, and that is for suppressing the flow of a liquid between the seal rotation body and the seal stationary body. The seal stationary body has a plurality of holes on an inner surface facing the outer peripheral surface of the seal rotation body, and a groove in the circumferential direction of that inner surface. The seal rotation body has a first protrusion that projects towards the groove.

Description

technical field [0001] The invention relates to sealing devices and rotating machines. Background technique [0002] Rotating machines such as turbines, compressors, and pumps are generally provided with sealing devices that reduce the amount of leakage of fluid from a gap between a stationary side and a rotating side having a differential pressure. [0003] As the above-mentioned sealing device, a non-contact type and highly reliable sealing device is often used. A labyrinth-shaped sealing device is known as a typical non-contact type sealing device (hereinafter simply referred to as a non-contact type seal). However, in a rotating machine equipped with such a non-contact seal, due to the asymmetrical pressure distribution (hereinafter referred to as pressure distribution) in the circumferential direction generated by the swirling flow of fluid (hereinafter referred to as vortex), the rotor may Self-excited or forced vibrations are generated in which the swirling flow of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/44F04B39/00F04D29/08F04D29/10F16J15/40
CPCF16J15/4472F16J15/44F16J15/444F04D29/102F04D17/122F04D29/083F04D17/10F04D29/667
Inventor 桥爪启
Owner MITSUBISHI HEAVY INDUSTIES COMPRESSOR CORP