Study on a New Static Sealing Method and Sealing Performance Evaluation Model for PEMFC

Abstract

The long-term stability and durability of seals are critical for various instruments and types of equipment. For static sealing, an important sealing state, there are currently two representative sealing methods, namely, pre-compressing static sealing and adhesive static sealing. In this paper, the characteristics and shortcomings of these sealing methods are summarized. At present, some static sealing requirements are urgent and difficult. For example, the deterioration of the sealing performance is an important factor which limits the service life of proton exchange membrane fuel cells and redox flow batteries. Therefore, a new method of static sealing whose sealing materials are rubber elastomers is proposed, named alterable static sealing. Then, its sealing processes are proposed. Furthermore, the actual contact area ratio r is used as the standard for sealability. Based on the mathematical model of pre-compressing static sealing, the influence of interface bonding was considered, and the mathematical model of alterable static sealing was established. Moreover, the compensatory effect of alterable static sealing on the static sealing capacity of rubber elastomers was proved.

Lightweight Type-IV Hydrogen Storage Vessel Boss Based on Optimal Sealing Structure

“…The shaft seal is usually compact in design, occupies a small space, and is suitable for equipment and machinery with limited space. On the other hand, the shaft seal can maintain stable sealing at high temperatures or in corrosive environments to prevent hydrogen leakage [29,30]. In this paper, due to the complex structure of the valve and limited space, blindly opening a sealing groove on the valve will easily lead to insufficient strength of the valve.…”