Adjustable pressure release valve structure and oil tank isolating valve thereof

Abstract

The invention discloses an adjustable pressure release valve structure and an oil tank isolating valve thereof. The adjustable pressure release valve structure comprises a main valve, a pressure release valve element, a pressure release spring and a fixed seat; the main valve is provided with a pressure release cavity; the pressure release valve element is arranged in the pressure release cavity through the pressure release spring; the fixed seat is arranged at the top of the pressure release cavity; the top end of the pressure release spring abuts against the fixed seat; and the fixed seat is provided with an internal thread, the main valve is provided with an external thread, the fixed seat and the main valve are in cooperation at the top of the pressure release cavity in a height-adjustable manner through thread fit, and an anti-rotation structure is further arranged between the fixed seat and the main valve. The pressure release pressure value of the oil tank isolating valve can be adjusted, when a required value changes, adjustment can be conveniently and rapidly conducted, and the adjustable pressure release valve structure has the beneficial effects that the structure is simple, the manufacturing difficulty is lowered, and the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to the technical field of isolation valves, in particular to an adjustable pressure relief valve structure and an oil tank isolation valve. Background technique [0002] On plug-in hybrid vehicles, in order to meet the increasingly stringent national emission standards, the fuel tank system is usually equipped with a fuel tank isolation valve, which has become a standard configuration to reduce oil vapor evaporation / leakage. The function of the fuel tank isolation valve is to release and intake the fuel tank under high-pressure and negative-pressure conditions to ensure that the fuel tank structure is within the pressure-resistant range to protect the fuel tank. [0003] The oil tank isolation valve in the prior art usually includes a pressure relief valve structure. The pressure relief valve structure is to install the pressure relief valve core in the main valve through the pressure relief spring, so as to realize the opening or...

AI Technical Summary

Problems solved by technology

With this pressure relief valve structure in the prior art, the pressure value of the pressure relief is fixed. In terms of application, if the pressure of the fuel tank changes, it is not conducive to quickly adjust the protection structure of the isolation valve of the fuel tank; in terms of production, on the one hand, the pressure relief The spring needs to strictly control the tolerance offset, and the manufacturing cost of rigorous automotive electrical appliances will be relatively high; on the other hand, when the demand value changes, the spring and the fixed structure need to be replaced, which is not conducive to the redevelopment of derivative products; Tolerance involves parts and assembly, and the control factors increase, which is not conducive to rapid manufacturing in the product production process

Images