Throttling expansion type dense-tooth steam seal

A throttling expansion and steam seal technology, applied in the direction of leakage prevention, engine components, machines/engines, etc., can solve problems such as inability to prevent friction, poor sealing performance, and easy vibration of the shaft, and achieve the effect of ensuring safe operation

Inactive Publication Date: 2016-09-07
周惠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The steam seal ring most commonly used in modern steam turbines is still the comb-tooth structure. The working principle of the steam seal ring with the comb-tooth structure is to force the fluid to reduce its pressure through a tortuous way to reduce leakage. During assembly, the seal ring passes through The spring piece placed on the back of the seal arc block is pressed to the design position. When the seal teeth and the rotor are rubbed, the seal ring has a certain retreat, which will not seriously damage the shaft and seal ring, but it cannot prevent friction.
In recent years, with the development of technology, a variety of new types of air seals have been introduced from abroad, such as: contact air seals, side tooth air seals, honeycomb air seals, etc., but there are still poor sealing performance and large leakage , the shaft is easy to vibrate, easy to damage, etc.

Method used

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  • Throttling expansion type dense-tooth steam seal
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  • Throttling expansion type dense-tooth steam seal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 As shown, the throttling expansion dense gear seal is composed of several sections (generally 4 or more sections) of seal rings connected end to end. The steam seal ring includes a ring body 1, and at least two high-tooth sealing strips 2 are arranged on the peripheral surface of the ring body 1 opposite to the rotor. In this embodiment, two sealing strips 2 are used as examples. A plurality of low-toothed sealing strips 3 are densely arranged between the above-mentioned high-toothed sealing strips 2 to form densely toothed groups. The number of low-toothed sealing strips 3 in each densely toothed group can be determined according to the wide band of the ring body and the structure of the sealed part of the rotor. Properly set, generally there are at least 5 low-tooth sealing strips for each dense tooth group.

[0024] For the convenience of machining, the low-toothed sealing strips 3 densely arranged between two adjacent high-toothed sealing strips 2 ...

Embodiment 2

[0027] refer to figure 2 , the structural principle of this embodiment is basically the same as that of Embodiment 1, and the only difference is that three high-tooth sealing strips 2 are arranged on the circumferential surface of the ring body 1 opposite to the rotor, and the adjacent two high-tooth seals A plurality of low-toothed sealing strips 3 are densely arranged between the strips 2, and the axial gap between two adjacent low-toothed sealing strips 3 is about 2.5 mm.

Embodiment 3

[0029] refer to image 3 , the structural principle of this embodiment is basically the same as that of Embodiment 1, and the only difference is that four high-tooth sealing strips 2 are arranged on the circumferential surface of the ring body 1 opposite to the rotor, and the adjacent two high-tooth sealing strips A plurality of low-toothed sealing strips 3 are densely arranged between the sealing strips 2 , and the axial gap between two adjacent low-toothed sealing strips 3 is about 2.0 mm.

[0030] Experiments have proved that the steam leakage of this dense toothed steam seal is only 20% to 30% of the original comb-toothed steam seal. It has the advantages of good sealing performance and simple and reasonable structure. It is suitable for replacing and upgrading the dynamic seal of the existing steam turbine.

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Abstract

The invention relates to the technical field of steam seals, in particular to a throttling expansion type dense-tooth steam seal. The throttling expansion type dense-tooth steam seal is formed by connecting a plurality of segments of steam seal rings end to end. Each steam seal ring comprises a ring body, and at least two high tooth sealing strips are arranged at the position, opposite to a rotor, of the circumferential face of each ring body. Low tooth sealing strips are densely arranged between every two adjacent high tooth sealing strips. Due to the fact that the low tooth sealing strips are dense, air flow passes through a small chamber to be subjected to multiple times of throttling expansion pressure reduction, multiple stages of effective teeth are formed, and the sealing performance of the steam seal is improved; the steam seal can adapt to axial displacement of the rotor appearing in the running process, the sealing effect is guaranteed, and a unit can run safely in a small sealing clearance; and the steam seal is especially suitable for sealing of large rotor mechanical equipment, especially a steam turbine.

Description

technical field [0001] The invention relates to the technical field of steam seals, in particular to a throttling expansion type dense tooth steam seal, which is especially suitable for dynamic sealing of large rotor mechanical equipment such as steam turbines of steam turbine generator sets. Background technique [0002] Based on the characteristics of thermal power generation enterprises as a "technology-intensive" industry, aiming at the outstanding contradictions in the current development of enterprises, based on theory, the problems existing in steam turbine units, the direction of improving overall performance, and the technical ideas, routes, and implementation of comprehensive transformation are expounded. methods, measures and programs. The problems of "high investment, high consumption, high emission, difficult cycle and low efficiency" have always existed in the development of thermal power generation enterprises. How to transform and improve the economic perfor...

Claims

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Application Information

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IPC IPC(8): F01D11/02
CPCF01D11/02F01D11/003F05D2220/31
Inventor 周惠
Owner 周惠
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