Double check valve integrated device applicable to automobile fuel vaporization system

Abstract

The invention relates to a double check valve integrated device applicable to an automobile fuel vaporization system. The double check valve integrated device comprises a venturi body, a Venturi structure is formed in the venturi body, a main valve plate is arranged in a main connection end at the top of the Venturi body, a main end cover is connected to the main connection end to form a first check valve structure, an assistant valve plate is arranged in an assistant connection end at the side of the venturi body, an assistant end cover is connected to the assistant connection end to form a second check valve structure, and a main connector is arranged at the gas outlet end of the venturi body. Therefore, two check valves are integrated on one venturi, the number of parts in an EVAP system are decreased effectively, and the occupied space is also reduced; as the components are reduced on the whole, traditional steps of press fitting of pipes are reduced, and manufacturing and mountingin site are facilitated; each check valve can be designed as a structure of elbow and in an adjustable form, so that the requirements of pipe routing adjustment can be met; and various secondary andmain structures are available and can be selected according to pipeline types.

Description

technical field [0001] The invention relates to a valve device for a vehicle, in particular to an integrated double check valve device suitable for a fuel evaporation system of a vehicle. Background technique [0002] With the vigorous development of the modern automobile industry, the control of automobile exhaust emissions, fuel evaporation, leakage pollution and other issues has become one of the key points in the process of automobile research and development. Based on the published "GB18352.6-2016 Light Vehicle Pollutant Emission Limits and Measurement Methods (China Phase Six)", the amount of vehicles allowed to volatilize into the atmosphere needs to be strictly controlled. In the vehicle fuel evaporation control system (EVAP ), the fuel vapor from the fuel tank is often temporarily stored in the carbon tank connected to it, and finally desorbed into the engine for combustion. At present, the technical solution of arranging the venturi tube and matching the check val...

AI Technical Summary

Problems solved by technology

[0006] For this reason, in the existing fuel evaporation control system (EVAP), there are the following defects: the check valve and the Venturi tube are independent parts, the number of parts is large, and the space occupied is large

More importantly, there is no one-way valve in the existing system. When the throttle valve fails, the fresh air enters the intake manifold through the air filter, the venturi tube, and the one-way valve along the pipeline, so that the Excessive air intake, resulting in unstable idling

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