Oil tank liquid level control valve integrated with one-way valve

Abstract

An oil tank liquid level control valve integrated with a one-way valve comprises an upper valve body and a lower valve body. The upper valve body and the lower valve body are connected to limit a cavity. A first venting hole is formed in the top of the upper valve body, and a liquid level window is arranged on the side face of the upper valve body and communicates with an oil tank. A first floater, a second floater and a spring are arranged inside the cavity. A first valve plate is arranged on the first floater, and a second venting hole is formed in the first floater. The second floater is arranged at the bottom of the first floater and connected with the first floater. A second valve plate is arranged at the upper end of the second floater, the bottom of the second floater is connected with the upper end of the spring, and a spring base is arranged at the lower end of the spring. An oil return opening is formed in the bottom of the lower valve body, and an umbrella valve plate is arranged at the bottom of the lower valve body and comprises an umbrella rod and a circular valve plate. The upper end and the lower end of the umbrella rod are connected with the lower valve body and the circular valve plate correspondingly, and the circular valve plate is located at the lower end of the oil return opening. By the adoption of the oil tank liquid level control valve integrated with the one-way valve, the refueling amount of fuel oil is accurately controlled by the umbrella valve plate and the liquid level window, the umbrella valve plate can also guarantee one-way backflow of thefuel oil, and the phenomenon that due to leakage of the fuel oil, the danger exists is avoided. The structure is simple, and the production cost is low.

Description

technical field [0001] The invention relates to the technical field of auto parts, in particular to a fuel tank liquid level control valve with an integrated check valve. Background technique [0002] At present, the fuel tanks of vehicles under the National V emission standard are generally equipped with vent valves (code-named GVV) to ensure the fuel tank venting function when the vehicle is running normally. Compared with the national five emission standard automobile fuel tank vent valve, which only has normal ventilation function, the national six standard automobile fuel tank has increased refueling evaporative emission and filling volume control requirements. The liquid level control valve (code FLVV) realizes the control of the filling amount when filling fuel, reduces the amount of refueling vapor entering the carbon tank, and meets the requirements of refueling vapor recovery. [0003] Although control valves for automobile fuel tanks meeting the National VI stand...

AI Technical Summary

Problems solved by technology

For example, the control of fuel tank filling volume is not precise enough, the structure is complicated, and the production cost is high.

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