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    • 5. 发明授权
    • Gas turbine engine with turbine tip clearance control device and method
of operation
    • 带涡轮顶端间隙控制装置的燃气轮机和操作方法
    • US5064343A
    • 1991-11-12
    • US552133
    • 1990-07-13
    • Stephen J. Mills
    • Stephen J. Mills
    • F01D11/16F01D11/18
    • F01D11/16F01D11/18
    • The problem of excessive clearances being generated by rub occurring between the tips of turbine blades and the linings on shroud segments which surround the blades is addressed by way of providing a valve 42 of a metal of different coefficient of expansion than the shroud control ring 24. On ground running prior to take off of an associated aircraft, the valve diverts a cooling airflow away from the ring 24, thus causing it to run hot and expand radially. The shrouds 22 are thus moved away from the blade tips 40 and on take off, are sufficiently far away from the tips 42 as to avoid deep penetration of the lining 38 thereby. The higher temperature generated by take off affects the valve 40 and makes it expand rapidly, to open the cooling airflow paths to the ring 24 via the holes 46 and 50.
    • 通过提供涡轮叶片的尖端和围绕叶片的护罩段上的衬里之间产生的过度间隙的问题通过提供具有与护罩控制环24不同的膨胀系数的金属的阀42来解决。 在起飞相关飞行器之前的地面运行中,阀将冷却气流从环24分离,从而使其运行热并径向膨胀。 因此,护罩22从叶片尖端40移开并且在脱离时离开顶部42足够远,以避免衬里38的深入穿透。 通过起飞产生的较高温度影响阀40并使其迅速膨胀,以经由孔46和50打开到环24的冷却气流路径。