Steam turbine rear steam seal device

A steam turbine and rear steam seal technology, which is applied to mechanical equipment, engine components, machines/engines, etc., can solve the problems of small concession gap and easy wear, and achieve the effects of reduced leakage, good sealing effect and reduced wear

Active Publication Date: 2015-11-18
WEIFANG LEINUOTE POWER EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a steam turbine rear steam seal device, which aims to solve the technical problem that the traditional steam seal structure has a small concession gap and is easy to wear

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Embodiment Construction

[0012] In order to make the object, technical solution and advantages of 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.

[0013] figure 1 A schematic structural view of the steam turbine rear steam seal device provided by the embodiment of the present invention is shown, figure 2 yes figure 1 In the enlarged view at A, for ease of description, only the parts relevant to the present invention are shown in the figure.

[0014] Such as figure 1 , figure 2 Commonly shown, the steam turbine rear steam seal device provided by the embodiment of the present invention includes a steam seal body 3 arranged between the cylinder block 1 and the rotor 2 of the steam turbine, and the rotor 2 is provided with an annular rotor ...

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Abstract

The invention belongs to the technical field of steam turbines and provides a back steam seal device of a steam turbine. The back steam seal device comprises a seal body, wherein a groove of a rotor is internally provided with a first seal ring, a groove of a steam seal body is internally provided with a second seal ring, the first seal ring is provided with two rotor steam-stopping ring faces extending to the second seal ring along the radial direction of the rotor, and the diameter of the upstream rotor steam-stopping ring face is more than that of the downstream rotor steam-stopping ring face along an air flow direction; and the second seal ring is provided with two steam-seal-body steam-stopping ring faces which extend out of the steam seal body, and an included angle is formed between the two steam-seal-body steam-stopping ring faces. Compared with the traditional stage tooth structure, the back steam seal device has the advantages that a moving path of steam between the seal rings is increased, so that more pressure of the steam is reduced, the leakage quantity of the steam is reduced, a seal effect is better, the allowable displacement in axial and radial directions is increased to certain extent when the rotor expands under heat, thus, the abrasion of the steam seal device is reduced, and the service life of the steam seal device is prolonged.

Description

technical field [0001] The invention belongs to the technical field of steam turbines, in particular to a rear steam seal device of a steam turbine. Background technique [0002] A steam turbine is a rotating machine powered by steam and converts the thermal energy of steam into mechanical work. It is the most widely used prime mover in modern thermal power plants. The steam turbine has the advantages of large single-unit power, high efficiency, and long life. The air leakage loss of the steam turbine accounts for about 1 / 3 of the internal loss. The steam seal of the steam turbine can prevent the outside air from entering the steam turbine and mixing with the steam in the steam turbine, reducing the steam leakage. [0003] For the sealing device of the traditional structure, the design of the clearance gap of the steam seal is too small, especially when the speed exceeds the critical speed, the vibration increases, causing dynamic and static friction, and the steam seal is s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D11/02
Inventor 王立君信景光
Owner WEIFANG LEINUOTE POWER EQUIP
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