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Sealing structure of scapular of diaphragm of steam turbine

A sealing structure, steam turbine technology, applied in mechanical equipment, engine components, machines/engines, etc., can solve the problems of steam leakage at the shoulder blade position of the diaphragm, poor sealing effect on the outlet side, deformation of the sealing surface, etc., to improve the efficiency of the unit, Good sealing effect

Active Publication Date: 2012-01-25
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This structure has a good sealing effect at the initial stage of operation, but after long-term operation, due to the deformation and fouling of the sealing surface, the sealing effect on the outlet side is poor. So there is serious steam leakage at the shoulder blade position of the partition

Method used

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  • Sealing structure of scapular of diaphragm of steam turbine
  • Sealing structure of scapular of diaphragm of steam turbine
  • Sealing structure of scapular of diaphragm of steam turbine

Examples

Experimental program
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Effect test

Embodiment 1

[0028] see figure 1 , figure 2 Shown is the first embodiment of the present invention. The sealing structure is that the shoulder part of the partition 1 cooperates with the partition cover 5, the partition cover 5 at the joint part of the two is a groove, the partition 1 is a boss, and the two are concave-convex. The partition 1 and the partition sleeve 5 form three mating surfaces, which are respectively: a mating surface A on the steam inlet side, a mating surface C on the steam outlet side, and a circumferential mating surface B. There is an elastic structure on the matching surface A of the steam inlet side and the matching surface C of the steam outlet side respectively, and the elastic structure is arranged on the separator 1 and is an integral structure with the separator 1; The sealing tooth 3 can be arranged on the partition 1 or the partition sleeve 5 arbitrarily. The specific position of the elastic structure satisfies the following relationship: the distance ...

Embodiment 2

[0030] see image 3 , Figure 4 , Figure 5 Shown: is the second embodiment of the present invention. The sealing structure is that the shoulder part of the partition 1 cooperates with the partition cover 5, the partition cover 5 at the joint part of the two is a groove, the partition 1 is a boss, and the two are concave-convex. The partition 1 and the partition sleeve 5 form three mating surfaces, which are respectively: a mating surface A on the steam inlet side, a mating surface C on the steam outlet side, and a circumferential mating surface B. There is an elastic structure on the matching surface A of the steam inlet side and the matching surface C of the steam outlet side respectively, and the elastic structure is arranged on the partition cover 5, which is an integral structure with the partition cover 5; there is a steam seal tooth 3 on the circumferential matching surface B , The seal teeth 3 can be arbitrarily arranged on the separator 1 or the separator sleeve 5 ...

Embodiment 3

[0033] see Image 6 , Figure 7 , Figure 8 Shown is the third embodiment of the present invention. The sealing structure is that the shoulder part of the partition 1 cooperates with the cylinder 5, the partition 1 at the joint part of the two is a groove, and the cylinder 5 is a boss, and the two are concave-convex. The separator 1 and the cylinder 5 form three mating surfaces, which are respectively: the mating surface C on the steam inlet side, the mating surface A on the steam outlet side and the circumferential mating surface B. There is an elastic structure on the matching surface A of the steam inlet side and the matching surface C of the steam outlet side respectively. The elastic structure is arranged on the cylinder 5 and is an integral structure with the cylinder 5; 3 can be arranged on the dividing plate 1 or the cylinder 5 arbitrarily. The specific position of the elastic structure satisfies the following relationship: the distance between the elastic structur...

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Abstract

The invention provides a sealing structure of a scapular of a diaphragm of a steam turbine. The scapular part of the diaphragm is matched with a diaphragm sleeve or a cylinder, or the scapular part and the diaphragm sleeve or the cylinder are matched in the concave and convex relationship with three matched surfaces of a steam inlet side matched surface, a steam outlet side matched surface and a circle matched surface, wherein the steam inlet side matched surface and the steam outlet side matched surface are respectively provided with an elastic structure, and the elastic structures are arbitrarily arranged on the diaphragm, the diaphragm sleeve and the cylinder and integrated with the diaphragm, the diaphragm sleeve and the cylinder; all the matched surfaces are micro-interference fit, thereby leading the elastic structures to be compressed to form sealing pieces and ensuring the steam inlet matched surface and the steam outlet matched surface to be sealing surfaces. The elastic structures have excellent sealing effect; all the sealing surfaces can still keep the good contact with each other and the good sealing effect even if the sealing surfaces are deformed and encrusted with scales, therefore, the scapular part of the diaphragm does not cause the steam leakage, and the unit efficiency is effectively improved.

Description

technical field [0001] The invention relates to a steam turbine diaphragm, in particular to a sealing structure at the shoulder blade of the diaphragm. Background technique [0002] The diaphragm is the most important stator passage part of the steam turbine. The sealing effect of the diaphragm determines the leakage steam flow rate, which has a great influence on the efficiency of the steam turbine. There are three steam leakage passages on the diaphragm, one is the steam leakage passage between the diaphragm and the rotor blade shroud, the second is the steam leakage passage between the diaphragm and the rotor, and the third is the leakage between the diaphragm shoulder blade and the diaphragm. Leakage channels between plate sleeves or cylinders. Since the first two steam leakage passages are the passages between the rotor part and the stator part, and are dynamic sealing structures, there must be gaps, which are the most important steam leakage passages. The steam turbin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D11/12
Inventor 方宇唐清舟刘春
Owner DONGFANG TURBINE CO LTD