Adjustable variable-section air duct connector for internal combustion engine ventilation experiment

The invention relates to the technical field of internal combustion locomotives, and especially relates to an adjustable variable-section air duct connector for internal combustion engine ventilation experiment. The adjustable variable-section air duct connector comprises a basic framework, a vertical size adjusting mechanism, and a transverse size adjusting mechanism. The basic framework is welded with steel plates. One end of the basic framework is designed into a flange which is connected with a corresponding air duct of an air source, and the other end is an open end which is connected with the interface of an experimental model pipeline in a plugging way. The vertical size adjusting mechanism and the transverse size adjusting mechanism are arranged in the cavity of the basic framework near the flange, and the vertical size adjusting mechanism is arranged above the transverse size adjusting mechanism. The size of the open end of the connector can be adjusted in a stepless way within a certain size range. The mechanisms adopt manual adjustment, the structure is simple and reliable, section transition is smooth and has small resistance, the connector can be used repeatedly, and the cost of experiment is reduced.