Fuel tank cap capable of adjusting internal air pressure and external air pressure

Abstract

The invention discloses a fuel tank cap capable of adjusting internal air pressure and external air pressure. The fuel tank cap comprises a supporting plate, wherein the supporting plate is in threaded connection with a fuel spray nozzle; a fuel tank outer cap is arranged on the upper part of the supporting plate; an air-steam valve body is arranged in the fuel tank outer cap and comprises an upper choke, a lower choke and a middle cylinder; the upper choke and the lower choke respectively penetrate through the top plate of the fuel tank outer cap and the supporting plate; bases are respectively arranged at tips of the upper choke and the lower choke; a piston is arranged in the cylinder; a spring is arranged between each base and the piston; the valve body is divided into an upper valve body and the lower valve body by the piston; shallow grooves are respectively formed in the inner wall of the upper valve body and the inner wall of the lower valve body; the shallow groove of the inner wall of the upper valve body extends to an upper port of the upper valve body; the shallow groove of the inner wall of the lower valve body extends to a lower port of the lower valve body; and the length of a shallow groove section positioned on the cylinder is not smaller than the thickness of the piston. By the fuel tank cap, the problem that an air valve and a steam valve are not positioned in the same component is solved, the air valve and the steam valve are integrated, parts are simplified, and meanwhile, the purpose of guaranteeing air pressure of inside and air pressure of outside to be consistent so as to protect a fuel tank is achieved.

Description

technical field [0001] The invention relates to the technical field of fuel tank caps, in particular to a fuel tank cap capable of adjusting internal and external air pressure. Background technique [0002] At present, the design of the air-steam valve used to adjust the pressure difference between the inside and outside of most fuel tank caps is to assemble the air valve and the steam valve separately, which makes the process requirements higher and the structure more complicated, which is not conducive to the repair and inspection of the equipment, and also The cost of the equipment is increased and the service life of the parts is shortened. The purpose of the present invention is to solve the problem that the air valve and the steam valve are not in the same part, so that the air-steam valve in the fuel tank cover is integrated, and the parts are greatly simplified. Make the internal air pressure consistent with the external air pressure to protect the fuel tank and prol...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a fuel tank cover that can adjust the internal and external air pressure, so as to solve the above-mentioned multiple defects in the prior art, such as high process requirements, complex structure, and high cost.

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