Honeycomb spiral radial brush-type labyrinth split seal

Abstract

The invention relates to a honeycomb spiral radial brush-type labyrinth split seal. The honeycomb spiral radial brush-type labyrinth split seal comprises a shaft sleeve assembly, a honeycomb seal body assembly, a driving end brush-type seal assembly and an impeller end brush-type seal assembly, wherein the driving end brush-type seal assembly and the impeller end brush-type seal assembly are arranged at the two ends of the honeycomb seal body assembly. An original seal length is nearly doubled, and the sealing effect is effectively enhanced. The shaft sleeve assembly, the honeycomb seal body assembly, the driving end brush-type seal assembly and the impeller end brush-type seal assembly are all of a split structure. Due to the fact that all the assemblies are of the split structure, the applied range is made wider. A shaft sleeve is in a split type and is closed at the outer circle position and the end face position of the shaft sleeve, so that strength of the shaft sleeve is increased, and the phenomenon that the shaft sleeve can be split due to insufficient closing force in the high-speed rotating process is prevented. Moreover, the middle part and the driving end of the shaft sleeve are both provided with bosses, due to the facts that a spiral groove and seal teeth arranged in the middle section boss are matched, and a groove formed in the back of an impeller and the impeller end brush-type seal assembly are also matched, the original seal length is nearly doubled, and the sealing effect is greatly enhanced. The structure is novel and the practicality is high.

Description

[0001] Technical field: [0002] The invention relates to the technical field of sealing, in particular to a honeycomb helical radial brush-type comb-tooth split seal. [0003] Background technique: [0004] At present, in gas turbines, steam turbines, compressors, turbo pumps and other impeller machinery, the most common seal is the comb seal. solved problem. Especially with the development of turbomachinery in the direction of high efficiency, stability and high power, the harm of fluid excitation in the traditional comb seal gap is becoming more and more prominent. It has become one of the key technologies in the development of modern turbomachinery to reduce the leakage of the sealing gap, suppress the fluid excitation in the sealing gap, and ensure the stability of the unit operation. [0005] In engineering practice, honeycomb sealing can effectively reduce vibration, but when the sealed gas has a high dust content, the honeycomb will be filled quickly and the sealing e...

AI Technical Summary

Problems solved by technology

[0005] In engineering practice, the honeycomb seal can effectively reduce the excitation, but when the sealed gas has a high dust content, the honeycomb will be filled quickly and lose the sealing effect

And the common honeycomb seal sleeve is a straight-through type, so that when sealing, part of the sealing gas does not enter the honeycomb hole to expand and decompress, but directly overflows along the smooth outer circle of the sleeve, which affects the sealing effect

[0006] On the other hand, the large amount of steam leakage at the shaft end of the equipment is also a problem in many compressors and steam turbines. The sealing effect of the comb-toothed steam seal used is not ideal, which is generally caused by excessive clearance, and the loss caused by excessive clearance Can account for 50% of the total energy loss of the steam turbine

In fact, the traditional comb seal has a small gap during installation, but under the working conditions such as over-critical speed, the seal teeth are easily worn or lodging, so that the seal gap expands rapidly in a short time, resulting in serious leakage of the shaft end , a large amount of water in the lubricating oil will affect the sealing effect

[0007] Moreover, some equipment cannot remove the impeller to replace the seal due to structural limitations, so the shaft sleeve cannot be installed. When the comb seal is directly matched with the equipment main shaft, it is easy to cause damage to the equipment main shaft and difficult maintenance of the equipment, which brings great harm to the operation of the factory. inconvenient

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