Driving structure for regulating area of external culvert

Abstract

The invention provides a driving structure for adjusting the area of an outer culvert. The driving structure comprises a sliding cylinder (10), an upper four-bar mechanism and a lower four-bar mechanism, wherein the sliding cylinder (10) is located at an outlet of the outer culvert, the sliding cylinder (10) axially moves to change the area of the outlet of the outer culvert, the upper four-bar mechanism is connected with an actuating cylinder, the lower four-bar mechanism is connected with the sliding cylinder (10), and the upper four-bar mechanism and the lower four-bar mechanism are connected through a coaxial connection. The driving structure controls the smooth and accurate axial movement of the outer culvert way sliding cylinder, limits the freedom of the sliding cylinder through theapplication of a symmetrical crank-connecting rod mechanism, and has the advantages of unique movement direction, good displacement precision, stable system, rapid reaction and no clamping stagnation.

Description

technical field [0001] The invention belongs to the design field of regulating mechanisms in gas turbine engines, focuses on the design of driving mechanisms, and particularly relates to a driving structure for regulating the external area. Background technique [0002] In order to realize the variable cycle of the variable cycle engine, the bypass ratio needs to be changed at first, and an axially moving sliding cylinder is needed to control the size of the bypass channel area. [0003] At present, there is a common scheme of a conventional single crank and a single connecting rod for the adjustment method of the slide cylinder. In this conventional scheme, there is a circumferential component force in the connecting rod, which will cause the rotational freedom of the sub-slider to be not unique, and the axial displacement is uncontrollable; the conventional scheme will add a guide rail to avoid circumferential movement, but for the thermal expansion of the engine For larg...

AI Technical Summary

Problems solved by technology

In this conventional scheme, there is a circumferential component force in the connecting rod, which will cause the rotational freedom of the sub-slider to be not unique, and the axial displacement is uncontrollable; the conventional scheme will add a guide rail to avoid circumferential movement, but for the thermal expansion of the engine For larger mechanisms, it is easy to get stuck and has a low safety factor; therefore, other driving methods and structures must be used

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