Labyrinth sealing device capable of reducing gap leakage flow

Abstract

The invention discloses a labyrinth sealing device capable of reducing gap leakage flow. The labyrinth sealing device is provided with an airflow guiding channel, an airflow guiding hole is formed inthe position, corresponding to the middle of a first-stage labyrinth cavity, of a sealing bush, the airflow guiding hole can guide high-pressure gas in the first-stage labyrinth cavity into the airflow guiding channel, a first jet hole is formed in the position, corresponding to the middle of each secondary labyrinth cavity, of the sealing bush, a second jet hole is formed in the position, corresponding to a throat and an expansion section of a gradually-shrinking and gradually-expanding channel, of the sealing bush, the first jet holes and the second jet holes are in communication with the airflow guiding channel, high-pressure airflow in the airflow guiding channel can be jetted out from the first jet holes, the high-pressure airflow is strongly mixed with fluid flowing out of the labyrinth tip gaps in the labyrinth cavities, the high-pressure airflow in the airflow guiding channel can be jetted out from the second jet holes to press main airflow in the gradually-shrinking and gradually-expanding channel, and the back pressure at the transition section is improved. The labyrinth sealing device has the technical effect that the fluid leakage amount can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of aero-engines, in particular to a grate tooth sealing device for reducing the leakage flow of a gap. Background technique [0002] In rotating machinery such as aero-engines, because there is a certain gap between the rotating rotor and the stator bushing, gas leaks between the rotating and static parts. This leakage flow will cause the flow rate of the mainstream fluid to decrease, resulting in The efficiency of the engine is reduced, and even problems such as blade vibration and deformation will occur, which will affect the performance and life of the engine. The grate tooth seal is a non-contact dynamic seal structure with simple structure and reliable performance, which is applied to rotating machinery such as aero-engines. It uses the special combined structure of the grate tooth and the sealing ring surface to consume the kinetic energy of the fluid, increase the flow resistance, and finally reduce ...

AI Technical Summary

Problems solved by technology

If the sealing gap is too large, the leakage will increase, which is not conducive to improving engine efficiency

However, if the gap is too small, the rotation of the rotor will cause the tooth tip and the stator bush to scratch, which will reduce the life of the engine and even cause danger.

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