High-speed working condition pumping reducing device

A high-speed working condition pumping reducing device belongs to the technical field of internal combustion engines. The high-speed working condition pumping reducing device comprises an engine air inlet pipe, a pressurizer, an engine, an engine exhausting pipe, a turbine, a connection pipe, an adjusting cavity, a rotating shaft, a rotating plate, a control cavity, an inner pipe, a spring, a rotating body and a stressing plate, wherein the adjusting cavity and the control cavity are coaxially connected by the rotating shaft; the stressing plate is connected with the left wall surface of a fixed body by the spring; one end of a second connection pipe is communicated with an inner cavity of the control cavity; the other end of the second connection pipe is connected with the engine air inlet pipe between an intercooler and a throttle valve. According to the high-speed working condition pumping reducing device, when the engine is operated under a high-speed working condition, the front exhausting volume of the turbine is larger, the pumping loss is lower and the oil consumption is lower; when the engine is operated under a low-speed working condition, the front exhausting volume of the turbine is smaller, pulse energy can be sufficiently utilized and the oil consumption is lower. The high-speed working condition pumping reducing device has a reasonable design and a simple structure, and is suitable for an optimal design of a turbine pressurizing engine exhausting system.