A fuel vapor liquefaction recovery device and its fuel evaporation discharge system

Abstract

The invention discloses a fuel vapor liquefaction recovery device and a fuel vapor discharge system thereof. The fuel vapor liquefaction recovery device comprises an upper end cover, a casing and a lower end cover which are sequentially connected from top to bottom to form a sealed cavity. The upper end cover, the shell The body and the lower end cover are respectively provided with a first pipe joint, a second pipe joint, and a third pipe joint; the housing is provided with an annular self-rotating separation chamber corresponding to the second pipe joint, and the self-rotating separation The inner edge of the chamber surrounds and forms a hollow part that penetrates up and down. The upper end of the hollow part communicates with the first pipe joint. The casing is provided with an impeller assembly and a separation guide cover under the self-rotating separation chamber; inside the lower end cover A one-way valve assembly is provided which only flows in the direction of the third pipe joint. The invention utilizes the kinetic energy formed by the high-speed fuel vapor generated during refueling, through the airflow self-rotation and the centrifugal force separation of the blades, gathers the tiny droplets to liquefy them, and returns them to the fuel tank assembly.

Description

technical field [0001] The invention relates to evaporative emission of vehicle fuel, in particular to a fuel vapor liquefaction recovery device and a fuel evaporative emission system thereof. Background technique [0002] Gasoline used in automobiles is extremely volatile, and direct discharge into the atmosphere will cause air pollution. China has already begun to implement the National VI motor vehicle emission regulations at this stage. The type VII test stipulated in the regulations is to test the emission of gasoline vapor when the vehicle is refueled, and the emission of HC is required to be ≤0.05g / L. The current mature solution is to use a larger volume of activated carbon to absorb the gasoline vapor generated when refueling. The emission of gasoline vapor is directly proportional to the effective volume of carbon powder in the carbon tank. If the volume of carbon powder in the carbon tank is large, the emission of gasoline vapor volatilized from the carbon tank wi...

AI Technical Summary

Problems solved by technology

1. Under the condition that the total desorption volume is 120 to 60 times the effective volume of the carbon powder in the carbon tank, it is necessary to fill the carbon tank with special low-permeability carbon powder or add carbon rods (the purpose is to reduce the residual HC in the carbon powder amount), so the cost of the carbon tank will increase by more than 100 yuan

2. Under the condition that the total desorption volume is less than 60 times the effective volume of the carbon powder in the carbon tank, the fuel evaporation control system usually adopts a scheme similar to that of PHEV models, and uses the fuel tank isolation valve to divide the fuel evaporation control system into two parts, so that The leakage detection device of the fuel evaporation control system adopts the DMTL device, which will cause the cost of the entire fuel evaporation control system to increase by more than 500 yuan

However, the negative pressure pump used in this patent is an electrical component, which is costly and has potential safety risks; it is also necessary to add a control valve to start it when refueling, which has high energy consumption and complicated operation

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