空间站用膜片式减压阀密封设计及验证OA

The space station's environmental control and life support system requires pressure-reducing valves with high sealing integrity,pressure stability and mechanical environmental adaptability.A diaphragm type pressure-reducing valve is designed to meet these demands.A micron-scale filter is integrated at the valve's inlet and outlet,which enhances the anti-pollution capability and prevents seal failure caused by foreign objects.The throttling pair employs a titanium alloy-fluororubber edge seal structure with a hard stop design,achieving long-term reliable sealing under low sealing force.The optimized diaphragm structure and fine-thread adjustment mechanism improve outlet pressure control precision.The mechanical simulation analysis confirms that all three primary natural frequencies exceed 2200 Hz,meeting space station mechanical design standards.After random vibration,shock and other mechanical tests,along with helium mass spectrometry leak detection and zero-flow pressure rise sealing tests,the product demonstrates excellent performance consistency before and after mechanical environmental testing.The external leakage rate is not more than 8.0×10-7 Pa·m3/s,with a 0.5 h pressure rise not more than 0.63 kPa.All metrics exceed design requirements.The valve has been successfully deployed in orbit,providing a reference for designing high-precision pressure-reducing valves in the aerospace field.