Check valve for engine

Abstract

The invention provides a check valve for controlling air current to flow in one direction on an engine, which consists of an upper shell, a lower shell, a membrane and a support sheet. The support sheet and the membrane are matched with a positioning boss of the upper shell through a mounting hole and are matched with a positioning hole of the lower shell to realize axial limitation of the membrane through the positioning boss of the upper shell. Gas acts upon the membrane from an air inlet of the upper shell to an air pore on the support sheet, the membrane carries out structure deformation under the action of the air current to reserve a gap with the upper shell, and the air current passes through an air outlet of the lower shell to flow out through the gap to realize the flowing action of positive air current of the check valve. When the gas flows reversely, the membrane cannot deform due to the action of the air current, the reversed air current is stopped by the matched sealing action of the membrane and the upper shell, and the membrane has favorable sealing performance on the reversed air current. The check valve has the advantages of simple structure composition, easy assembly, light weight and small volume, can ensure that the air current is smooth when the air current positively flows, and has favorable airtightness when the air current reversely flows, thereby the requirements on related performance are satisfied.

Description

technical field [0001] The invention relates to a one-way valve, in particular to a one-way valve for controlling the unidirectional flow of airflow on a supercharged engine. Background technique [0002] The engine check valve is arranged between the air filter and the supercharger and between the supercharger and the intake manifold, such as figure 1 As shown, it plays the role of controlling the unidirectional flow of airflow to prevent the gas from entering the crankcase in reverse. Since the gas contains some impurities such as water and oil, the one-way valve should be corrosion-resistant, and the gas path will not be blocked after a long time of use. Due to the frequent opening and closing of the one-way valve, the one-way valve should be able to withstand impact. And the one-way valve requires small opening pressure, small airflow resistance, less leakage, can withstand a large reverse working pressure difference, and has low working noise. [0003] Patent No. ZL2...

AI Technical Summary

Problems solved by technology

The one-way valve controls the unidirectional flow of airflow through several elastic reeds. The cross-sectional area of ​​gas flow is small, the opening pressure is large, and the airflow resistance is large. Moreover, it is necessary to ensure the sealing of several elastic reeds in contact with the air outlet surface, which is reliable. decreased sex

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