Anti-backlash fuel filling system

Abstract

The invention discloses a fuel oil filling system capable of preventing reverse ejection. The fuel oil filling system capable of preventing reverse ejection comprises a main fuel tank, an oil filling pipe and a main vent pipe, wherein the oil filling pipe is communicated with the main fuel tank, the air inlet end of the main vent pipe is communicated with the main fuel tank and the air outlet end of the main vent pipe is communicated with the oil filling pipe. In addition, the fuel oil filling system capable of preventing reverse ejection further comprises an assistant fuel tank and an overflow pipe, wherein the assistant fuel tank is arranged on the main fuel tank and provided with a leakage oil hole communicated with the main fuel tank; an oil outlet on the overflow pipe is communicated with the assistant fuel tank and an oil inlet on the overflow pipe is communicated with the oil filling pipe; the pipe at the position, close to the oil inlet, on the overflow pipe is an arc pipe and the highest point of the arc pipe is higher than the oil inlet. According to the fuel oil filling system capable of preventing reverse ejection, by arranging the assistant fuel tank and the overflow pipe, the back-flow oil liquid in the oil filling pipe can flow back into the assistant tank through the overflow pipe while oil liquid filling is stopped, and the problem of oil liquid reverse ejection is solved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a fuel filling system for preventing back injection. Background technique [0002] Fuel filling is one of the daily operations of vehicles. The filling process requires smoothness, safety and reliability. Therefore, the fuel filling system and its components have high design requirements. [0003] figure 1 It is a structural schematic diagram of the fuel filling system in the prior art, such as figure 1 As shown, the fuel filling system includes a fuel tank 1, a filling pipe 2 and a vent pipe 3, the fuel pipe 1 communicates with the fuel tank 2, one end of the vent pipe 3 communicates with the fuel tank 1, and the other end communicates with the fuel pipe 2 and is close to the fuel pipe 2 The location of the oil inlet. During fuel filling, fuel is injected into the fuel tank 1 through the filling pipe 2, and the compressed air on the upper part of the fuel tank 1 is discha...

AI Technical Summary

Problems solved by technology

[0004] However, during the fuel filling process, the internal pressure of the fuel tank 1 will gradually increase with the fuel filling. When the gun jumps, the pressure exerted by the fuel gun disappears instantly, and the pressure of the fuel tank 1 is released sharply, causing the fuel to go along The fuel pipe sprays back to the outside, causing fuel waste and even safety accidents

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