Automobile fuel tank isolating valve and valve element sealing structure

Abstract

The invention discloses an automobile fuel tank isolating valve and a valve element sealing structure, a valve element body is provided with a columnar structure, and a sealing fixing part extending in the axial direction is arranged in the middle of one end of a valve element; the sealing body is located at one end of the valve element body, a matching groove matched with the sealing fixing part is formed in the end, facing the valve element body, of the sealing body, and a sealing lip annularly extending in the axial direction is arranged at the end, away from the valve element body, of the sealing body. According to the valve element sealing structure of the automobile fuel tank isolating valve with the optimized design, a rubber part is structurally designed to be in a head round bowl opening thin lip form, stress deformation is sensitive, contact is consistent, and the sealing performance is better.

Description

FIELD [0001] The present invention relates to a hybrid vehicle technology, and in particular relates to an automotive fuel tank isolation valve and the valve body sealing structure. Background technique [0002] Defines the PHEV (plug-in hybrid Plug-in Hybrid Electric Vehicle) vehicle evaporative canister system to deal with the country six refueling and evaporative emission regulations, different from conventional vehicles, the system has strict regulations - non-integral only emission control fuel evaporation system (called NIRCO regulatory system), including two major components: a high-pressure tank and the tank isolation valve fuel tank isolation valve (FTIV valve). High-pressure tank can withstand a higher vapor pressure to ensure that during running, fuel vapor in the tank firmly sealed, the FTIV valve play an important role in this process. Under normal circumstances, the FTIV valve remains closed state, occurs only when the requested fueling, tank pressure exceeds a cert...

AI Technical Summary

Problems solved by technology

[0004] At present, the spool seal of the FTIV valve is in the form of a spool assembly gasket, and the sealing ring is prone to poor assembly after assembly, resulting in an excessive leak rate in the seal test

At the same time, the structure of the gasket is designed to be sealed in the form of plane contact, so that the sealing contact area is relatively large, because the spring thrust is small, usually less than 1N, which makes the gasket not easy to deform, and the contact force on the plane is uneven, resulting in excessive leakage rate. Large, unable to meet the requirements of China VI regulations

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