Double-wall high-performance refueling limiting valve and working method thereof

Abstract

The invention relates to a double-wall high-performance refueling limiting valve and a working method thereof. The double-wall high-performance refueling limiting valve comprises a shell, a floater assembly and a bottom cover, wherein the shell is arranged outside the floater assembly in a sleeving mode; the bottom cover is installed at the bottom of the shell and makes contact with the bottom of the floater assembly through a spring; the floater assembly comprises a floater shell, a sealing door and a floater; the sealing door is assembled at the upper part of the floater and is arranged in the floater shell together with the floater; the spring is arranged between the bottom of the floater and the bottom cover; the floater can move up and down in the floater shell; and a secondary opening vent hole is formed in the center of the upper end surface of the floater shell. According to the double-wall high-performance refueling limiting valve and the working method thereof provided by the invention, through a two-stage opening mode of the valve, rapid opening and pressure reduction under the high-pressure condition are achieved, and the safety of an oil tank and a vehicle system is improved; a double-wall structure is adopted, so that the dynamic leakage of liquid is zero under a dynamic condition; and different closing heights are achieved through modular design, so that diversified requirements are met.

Description

technical field [0001] The invention relates to the technical field of automobile fuel management systems, in particular to a double-wall high-performance refueling limit valve and a working method thereof. Background technique [0002] The refueling limit valve is an important part of the automobile fuel management system. The refueling limit valve directly determines the total volume of the refueling amount when refueling. At the same time, as the fuel consumption gradually decreases, it is required that the valve can be opened in time to increase exhaust. As we all know, the liquid is in a limited container, the more liquid there is, the smaller the liquid sloshing will be when the container is moving, and the less the liquid is, the greater the sloshing will be. As far as the fuel tank of a car is concerned, the greater the fuel sloshing, the more oil vapor is generated and needs to be discharged, so as not to cause the fuel tank to expand and deform, and it will also br...

AI Technical Summary

Problems solved by technology

At present, most of the fuel limit valves on the market are designed with only one level of opening capability. When the fuel limit valve is closed, the main exhaust of the system can only pass through the rollover valve, and the fuel limit valve cannot be opened under high pressure. The pressure in the system is always high. If you want to refuel the vehicle again, you can only wait for the dump valve to slowly reduce the pressure in the fuel tank.

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