Dual-valve-element sealing structure

Abstract

The present invention provides a dual-valve-element sealing structure. The dual-valve-element sealing structure comprises a valve seat assembly and dual valve elements; the bottom of each valve element is provided with an annular groove; the thickness of each valve element is 6mm; and the thickness of the remaining wall of a position, where the annular groove is dug, of each valve element is in a range of 1.5-3 mm. The thickness of each improved valve element is thinned to be 6mm from 7 mm before improvement, each valve element bottom directly impacted by exhaust gas is dug with the annular groove to thin the entity, so that the thickness of the remaining wall of the position where the valve element is thinned is in a range of 1.5-3 mm, and elastic deformation of the valve elements under high temperature can be ensured. According to an EGR valve by adoption of the dual valve elements having the new structure, the problem that leakage rate exceeds standard after operation is solved, and the leakage rate can be smaller and smaller even close to 0 after the EGR operates for some time, and the problem that the leakage rate exceeds the standard is thoroughly solved.

Description

technical field [0001] The invention relates to a double-valve core sealing structure, which belongs to the technical field of exhaust gas recirculation system for engine tail gas discharge. Background technique [0002] As a system to reduce engine exhaust emissions, the electric EGR valve is organically combined with other engine control systems, and has been widely used in various types of transport machinery engines such as automobiles and ships. [0003] At present, most electric EGR valves adopt a single-spool structure. For EGR that introduces a large amount of exhaust gas and is difficult to drive a DC motor, a double-spool structure is generally used. The so-called double-spool means that a finished EGR valve is equipped with a central rod and two valve cores. That is, the two valve cores cooperate with the valve seat to seal. What has been difficult to solve is that the leakage of the seal of the double-spool structure is relatively large. The current implementati...

AI Technical Summary

Problems solved by technology

What has been difficult to solve is that the leakage of the seal of the double-spool structure is relatively large. The current implementation standard is 15L / min60kPa, while the single-spool implementation standard is only 7L / min60kPa. What is worse is that the existing double-spool EGR valve was newly shipped. Obviously the leakage is within the standard range, but after running on the engine for a period of time, the leakage far exceeds the standard, and in severe cases, the engine will emit black smoke, the power will drop and the emission will not meet the standard

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