Auxiliary air flow control device

Abstract

The invention discloses a secondary air flow control device which is arranged between an intake end and an exhaust end of an engine. The air flow control device comprises a device body. The inside of the device body is provided with an air chamber. An intake pipe which is communicated with the intake end, and an exhaust pipe which is communicated with the exhaust end are arranged on the device body. The intake pipe is communicated with the exhaust end by the air chamber. The inside of the air chamber is provided with a bearing seat and has at least one vent. The inside of device body or the bearing seat is pivoted with a moving part which has at least one choke and a shielding part which control the open area of the vent. The moving part is connected with a throttle lead wire which draws the moving piece to rotate and reset to allow the choke and the shielding part to control the open area of the vent to control secondary air flow precisely. The device allow NOX and CO to be reduced effectively in the presence of a catalyst, thereby protecting the ozone layer, reducing hazards caused by acid rain and effectively protecting the environment.

Description

technical field [0001] The invention relates to a secondary air flow control device, in particular to a secondary air supply channel arranged at the exhaust gas discharge end of an engine to control the flow rate device for introducing the secondary air into the exhaust gas discharge end of the engine. The secondary air refers to the air extracted from the fresh air outside to be introduced into the engine exhaust exhaust end, which is different from the primary air used for mixing the engine gas. Background technique [0002] Catalytic converters for general engines coat (attach) a catalyst on a metal cylinder, and use noble metals containing Pd and Pt in the catalyst to oxidize harmful CO and HC in the exhaust gas into harmless CO 2 and H 2 O, or use the noble metal containing Rh in the catalyst to reduce the harmful NO in the exhaust gas X Revert to harmless N 2 and O 2 , to purify the engine exhaust gas, thereby reducing the impact of exhaust gas on the quality of th...

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned negative pressure control valve still cannot accurately control the flow rate of the secondary air into the exhaust gas discharge end, resulting in the inability of the catalyst to effectively reduce NO X phenomenon, so that it is discharged into the outside atmosphere, causing acid rain and the main factor of destroying the ozone layer, affecting the natural environment

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