An air flow regulating valve with small throttling loss

Abstract

The invention provides an air flow regulating valve with small throttle loss. The air flow regulating valve comprises a regulating valve body; the regulating valve body comprises a valve seat; a turbocharger is connected with one end of the valve seat; a driving shaft is installed between the turbocharger and the valve seat, and a servo motor and a crank are connected with the two ends of the driving shaft correspondingly; the two ends of the crank are hinged to a connecting rod and a guiding shaft correspondingly; and the outer side of the guiding shaft is fixedly connected to a flow guide cover, and the other end of the guiding shaft is sleeved with a sliding block; one side of the sliding block is hinged to the connecting rod and fixedly connected with a valve element. According to the air flow regulating valve, flow adjusting performance is good, a flow passage does not have direction sudden change and partial cross section severe contraction, the change degree of a flow area is slow, and regulating precision is high; and the flow passage cross section area constituted by the valve seat and the valve element contracts gradually, so that acceleration of airflow is facilitated, and the exhaust energy use ration of a downstream turbine is greatly increased.

Description

technical field [0001] The invention belongs to the field of electromechanical technology, and in particular relates to an air flow regulating valve with small throttling loss. Background technique [0002] When a marine diesel engine is matched with a turbocharger, the matching point is often selected in the common working condition of heavy load, which leads to low exhaust pressure before the turbine and low speed of the turbocharger when the diesel engine is working under low load conditions. , and work in the low-efficiency area, the boost pressure is insufficient, and the performance of the diesel engine is not good. [0003] The flow area of ​​the turbine is an important parameter that affects the matching between the diesel engine and the turbocharger. When the diesel engine is under heavy load, a larger flow area is required. Under this working condition, the diesel engine can have lower exhaust back pressure, and the pumping loss is small. It can provide enough exh...

AI Technical Summary

Problems solved by technology

[0004] Installing an ordinary regulating valve in front of the turbine can change the flow area of ​​the turbine, but when the exhaust gas of the diesel engine passes through the valve, due to the sudden change in the flow area, there will be a low-speed area and a vortex behind the valve core, resulting in a large throttling loss, low energy utilization of the turbine exhaust gas, and poor performance of the diesel engine. Instead worsened

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