Pneumatic-control valve lift regulating mechanism

Abstract

The invention relates to a pneumatic-control valve lift regulating mechanism and relates to the technical field of mechanical design. The pneumatic-control valve lift regulating mechanism comprises an air compressor, an engine, a turbine, connecting pipes, a valve seat, a valve block, a rotary shaft, a volumetric cavity, a rotor and an elastic part. The rotor is mounted in the volumetric cavity and hermetically contacts with the inner wall of the volumetric cavity. The lower wall of the rotor is connected with the lower wall of the volumetric cavity through the elastic part. Two ends of the first connecting pipe are communicated with an air inlet of a turbine exhaust pipe and an air inlet of the volumetric cavity. Two ends of the third connecting pipe are communicated with the upper wall of an engine exhaust pipe and the upper wall of the volumetric cavity. When the pressure of an engine intake pipe is high, the rotor drives the valve block to rotate clockwise, emission recirculation rate of the engine is high, and denotation pressure of the engine is low; when the pressure of the engine intake pipe is low, the rotor drives the valve block to rotate anticlockwise, emission recirculation rate of the engine is low, and oil consumption of the engine is low. The pneumatic-control valve lift regulating mechanism is reasonable in design, simple in structure, and applicable to exhaust recirculation systems for supercharged engines.

Description

technical field [0001] The invention relates to an exhaust gas recirculation system in the technical field of mechanical design, in particular to an air pressure control type valve body lift adjustment mechanism. Background technique [0002] Harmful emissions from engines are a major source of air pollution. With the increasing importance of environmental protection, the goal of reducing harmful emissions from engines has become an important direction for engine development in the world today. With the world's consumption of petroleum products increasing year by year, international oil prices remain high, and the economy of diesel vehicles is becoming more and more prominent, which makes diesel engines occupy an increasingly important position in vehicle power. Therefore, it is the primary task of diesel engine designers to carry out research on the control methods of harmful emissions from diesel engines. Exhaust gas recirculation system is to send a small part of the exh...

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Problems solved by technology

[0003] After searching the existing technical literature, it is found that Chinese patent number ZL200410063439.5, patent name: electronic exhaust gas recirculation gas control device, this patent technology provides a device for controlling the exhaust gas recirculation rate of the engine, which can better Taking into account the medium and high speed conditions of the engine; but the change of the exhaust gas recirculation rate is realized through a special control structure, which makes the control system more complicated

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