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Sealing structure of turbine blade tip clearance

A technology of blade tip clearance and sealing structure, which is applied in the directions of blade support elements, mechanical equipment, engine components, etc., can solve the problems that the sealing performance of the blade tip cannot be improved and the sealing effect is limited, so as to reduce the pressure difference, improve the sealing effect, The effect of reducing the leakage area

Pending Publication Date: 2022-02-11
STATE GRID HEBEI ENERGY TECH SERVICE CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional crown grate seal structure is to add a single-side sealing tooth on the casing or the crown, which has limited sealing effect and cannot improve the sealing performance of the blade top while ensuring the smooth movement of the rotor

Method used

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  • Sealing structure of turbine blade tip clearance
  • Sealing structure of turbine blade tip clearance
  • Sealing structure of turbine blade tip clearance

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Embodiment Construction

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0030] It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0031] It is to be understood that the terms "length", "width", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and other indicated orientations...

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Abstract

The invention provides a sealing structure of a turbine blade tip clearance. The sealing structure comprises a rotor, blades and a casing covering the blades, wherein an annular gap is reserved between the outer circumferential face of a blade crown of each blade and the inner circumferential face of the casing, and first sealing tooth sets are arranged on the inner circumferential face of the casing in the axial direction of the rotor at intervals; second sealing tooth sets are arranged on the peripheral face of each blade crown at intervals in the axial direction of the rotor; third sealing tooth sets are arranged in the annular gap in the axial direction of the rotor at intervals, one ends of the third sealing tooth sets are hinged to the first sealing tooth sets, and the other ends of the third sealing tooth sets extend to the side close to the second sealing tooth sets; and extending ends of the third sealing tooth sets have a first state pointing to the tooth tips of the second sealing tooth sets and a second state used for swinging to point to the tooth roots of the second sealing tooth sets under the impact of steam. According to the sealing structure of the turbine blade tip clearance, the sealing performance of the blade tips can be improved while the stable operation of the whole rotor is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of rotary mechanical seals, and more specifically relates to a sealing structure for a blade top gap of a steam turbine. Background technique [0002] A steam turbine is an external combustion rotary machine that converts steam heat energy into mechanical work. After the steam from the boiler enters the steam turbine, it passes through a series of ring-shaped nozzles and rotating blades in order to convert the thermal energy of the steam into the mechanical energy of the rotation of the steam turbine rotor. In order to prevent component damage caused by the friction between the rotor and the stator when the steam turbine is working, when the steam turbine is designed and manufactured, there will be a gap between the tip of the rotating blade and the cylinder wall of the casing. However, there is a certain pressure difference between the pressure surface and the suction surface of the rotating blade. Under t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D11/08F01D5/20
CPCF01D11/08F01D5/20
Inventor 唐广通杨海生李浩闫晓沛
Owner STATE GRID HEBEI ENERGY TECH SERVICE CO LTD
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