A non-contact brush seal and its manufacturing method

Abstract

The invention discloses a non-contact type brush-type seal and a manufacturing method of the non-contact type brush-type seal. The non-contact type brush-type seal comprises a gland sealing ring, a front baffle and a rear baffle, wherein the front baffle and the rear baffle are arranged on the gland sealing ring. The front baffle, brush brittles and the rear baffle are welded into a whole. The front baffle is located on the air inlet side and is in riveting joint with an installation groove in the gland sealing ring so as to be assembled with the gland sealing ring. The non-contact type brush-type seal further comprises a U-shaped riveting groove. The U-shaped riveting groove is located on the air inlet side. A certain dip angle is formed by the brush brittles in the rotating direction of a rotor. The non-contact type brush-type seal has the remarkable advantages that the seal can be adapted to the transient bounce of the rotor, gaps are kept unchanged, the sealing effect of the seal is kept for a long time, the brush bristles are resistant to high temperature and long in service life and are arranged in the rotation direction of the rotor at a certain angle, friction vibration can be reduced, and influence on the safety of a unit is small. According to the manufacturing method of the non-contact type brush-type seal, it is guaranteed that the seal is not broken in the operation process, the high-performance welding technology is adopted to guarantee that the brush bristles do not fall off, the optimized brush bristle bunch thickness and height guarantee the high sealing performance, and the sealing effect is guaranteed.

Description

Technical field [0001] The invention relates to the field of manufacturing seals for steam turbines, in particular to a method for manufacturing non-contact brush seals. Background technique [0002] Sealing can be divided into two categories: static sealing between relatively static joint surfaces and dynamic sealing between relatively moving joint surfaces. Static sealing mainly includes three types: rubber sealing and contact sealing. Dynamic seals can be divided into two basic types: rotary seal and reciprocating seal. According to whether the seal is in contact with the relative moving parts, it can be divided into contact seal and non-contact seal. Generally speaking, the contact seal has good sealing performance, but it is limited by friction and wear and is suitable for occasions where the linear velocity of the sealing surface is low. The non-contact seal has poor sealing performance and is suitable for higher speed occasions, such as steam seals in steam turbines. A...

AI Technical Summary

Problems solved by technology

However, there are still deficiencies such as that the seal gap cannot be adjusted during operation, the sealing effect cannot be guaranteed after the temperature rises, and the friction between the seal teeth and the shaft will easily cause permanent wear, etc., resulting in increased leakage and affecting the economical efficiency of the unit.

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