A high pressure resistant low hysteresis brush seal structure with nozzles on the front baffle

Abstract

The invention discloses a high-pressure-resisting low-hysteresis brush type seal structure of a front baffle with nozzles. According to the seal structure, two rows of tangent-radial inclined nozzlesare machined in the front baffle, radial inclined nozzles are formed by a front baffle top sloe and a rotor disc top sloe, a brush wire net is arranged between a brush wire bundle and the front baffle, and a flexible pressure bearing plate is arranged in the middle of the brush wire bundle; according to the high-pressure-resisting low-hysteresis brush type seal structure of the front baffle with the nozzles, the radial gap, caused by various reasons, between brush wires and a rotor can be reduced or eliminated, the brush wire bundle can move eccentrically along with the rotor, the brush type seal is tight, the property can be improved, the hysteresis effect is weakened, excessive bending and blowing-away effects of the brush wires in the axial direction under the high pressure difference condition can be reduced, brush type seal pressure bearing capacity is improved, the reverse tangent air flow speed more obvious than traditional brush type seal is provided, and the brush type seal rotor dynamic characteristic is improved.

Description

technical field [0001] The invention belongs to the technical field of rotary mechanical seals, and in particular relates to a high-pressure-resistant and low-hysteresis brush seal structure with a nozzle on the front baffle. Background technique [0002] In rotating machinery such as steam turbines, gas turbines, pumps and compressors, the rotary seal is installed between the rotating part and the stationary part to control the leakage flow from the high-pressure area to the low-pressure area through the dynamic and static gap, which has a significant impact on the operating efficiency of the turbomachinery . Traditional labyrinth seals and honeycomb seals have limited sealing performance due to the inherent gaps. In the prior art, the brush seal is a contact seal, the leakage is only 1 / 5-1 / 10 of that of the labyrinth seal, and it can well adapt to the instantaneous eccentricity of the rotor. Therefore, brush seals are widely used in gas turbines, aero engines and steam t...

AI Technical Summary

Problems solved by technology

The radial flow of the traditional brush seal airflow is weak, and the "closing effect" of the brush filament is also weak, so that the gap between the brush filament and the rotor cannot be well reduced or eliminated

[0005] In addition, the maximum pressure bearing capacity of the existing single-stage standard brush seal is limited. When the pressure difference is too large, it is necessary to consider the multi-stage brush seal design, and some occasions have limited axial space, which limits the application of the brush seal. scope

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