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Sealing device, rotating machine, and method for manufacturing sealing device

A technology of sealing device and manufacturing method, which is applied in the direction of mechanical equipment, engine sealing, engine components, etc., can solve the problems of difficulty in manufacturing sealing rings, energy loss, etc., and achieve the effects of reducing unnecessary leakage and improving equipment efficiency

Inactive Publication Date: 2016-06-22
MITSUBISHI HITACHIPOWER SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is very difficult to accurately predict the heat distribution during operation, and to manufacture individual seal rings divided into dimensions obtained from the predicted value, so it is usually designed to allow a certain degree of tolerance
Therefore, it is considered that there is actually a gap at the junction of adjacent segments, and leakage due to channeling (吹き抜け) originating from the gap results in energy loss.

Method used

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  • Sealing device, rotating machine, and method for manufacturing sealing device
  • Sealing device, rotating machine, and method for manufacturing sealing device
  • Sealing device, rotating machine, and method for manufacturing sealing device

Examples

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Effect test

Embodiment 1

[0038] figure 1 It is a schematic configuration diagram showing stages of a steam turbine provided with the first embodiment of the sealing device, the rotary machine, and the manufacturing method of the sealing device according to the present invention.

[0039] Such as figure 1 As shown, the stage of a steam turbine is the name of a group of constituent elements including the moving blade 2 connected to the rotor 1, and the stationary blade 3 installed between the diaphragm outer ring 4b and the diaphragm inner ring 4a. There are multiple sets in the axial direction of the turbine, thus forming a turbine stage as a whole. Furthermore, the airtightness inside the turbine is maintained by forming a structure in which the entire periphery of the turbine stage is surrounded by one or more layers of casing. In this embodiment, an inner case 5 and an outer case not shown are provided.

[0040] In the steam turbine configured in this way, in order to efficiently rotate the rotor...

Embodiment 2

[0062] Hereinafter, a second embodiment of the sealing device, the rotary machine, and the manufacturing method of the sealing device according to the present invention will be described with reference to the drawings. Figure 11It shows that the second embodiment of the sealing device, the rotating machine and the manufacturing method of the sealing device according to the present invention are converted into Figure 4 A schematic diagram of the relationship between an example of the cross-sectional shape observed from the direction perpendicular to the cut plane and the relationship between the opposite adjacent sealing sector after the V-V plane is cut. exist Figure 11 in, with Figure 1 to Figure 10 The indicated symbols are the same symbols and the same part, so detailed description thereof will be omitted.

[0063] Figure 11 In particular, it shows that the joint surface 8 of the sealing segment in the section 21a and the joint surface 8 of the sealing segment in th...

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Abstract

It is an object of the present invention to provide a sealing mechanism that, while preventing a clearance that passes in an axial direction through an entire abutting surface without involving large resistance and that invites blow-by of a working fluid, can prevent adjacent seal segments from sticking to each other, and a method for manufacturing the sealing mechanism. A sealing device 9 includes: an annular sealing ring 10 that includes a plurality of seal segments annularly juxtaposed; a plurality of seal fins 12 provided in an axial direction on an inner peripheral surface of the sealing ring; a joint surface 8 on a circumferential end of the seal segment, the joint surface 8 facing a joint surface 8 on an adjacent seal segment; a groove 20 that extends in a radial direction in the joint surface 8; and a protrusion 22 formed by bending part of a surface that constitutes a long side of the groove toward an outside of the joint surface.

Description

technical field [0001] The present invention relates to a sealing device, a rotary machine and a method of manufacturing the sealing device. Background technique [0002] Large-scale rotating machines such as steam turbines and gas turbines generally adopt a structure in which a rotating body disposed inside is surrounded by a casing in order to seal working fluid. The casing is usually manufactured in a state of opening and closing up and down, and is assembled after clamping the rotating body inside. The contact surface portion between the upper half case and the lower half case has a flange structure in which a part protrudes outward, and the internal airtightness is maintained by bolts penetrating the flange portion and fastened. [0003] Such a rotary machine has a gap between the rotating body and the stationary body, and if the working fluid leaks through the gap, energy loss will result. Therefore, a sealing mechanism is used to minimize the amount of the leakage. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/16F16J15/447F01D11/00B23P15/00
CPCF16J15/442F01D11/02F05D2220/32F05D2240/55F16J15/447
Inventor 水见俊介工藤健绪方康二及川慎司
Owner MITSUBISHI HITACHIPOWER SYST LTD