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1. Testing standards for air-cooled diesel engine drainage pumps
The testing standards for air-cooled diesel engine drainage pumps mainly cover aspects such as performance, sealing, durability, and safety protection. The flow rate and head need to meet the design requirements under rated operating conditions, usually measured using standard flow meters and pressure sensors; The efficiency should reach the industry standard value (such as ≥ 60%), calculated by the ratio of the input electrical power to the hydraulic power output of the potato; The cavitation allowance must meet the minimum requirements of the water pump operating environment to prevent cavitation damage and premature aging. Sealing testing includes shaft seal leakage (≤ 3 drops/minute) and shell airtightness (pressure drop ≤ 0.01MPa after holding at 0.2MPa for 5 minutes). The durability test requires continuous operation for no less than 500 hours, during which the flow rate and head attenuation rate shall not exceed 5%, and there shall be no abnormal vibration or noise. The vibration value should be controlled within the B-level limit specified in ISO 10816-3 (usually ≤ 4.5mm/s), and the noise should not exceed 85dB (A). In terms of safety, it is necessary to have effective protective covers, grounding resistance<4 Ω, insulation resistance>2M Ω, and pass the waterproof level verification of IPX5 or above. The detection environment temperature is 20 ± 5 ℃ and the relative humidity is ≤ 85%. All instruments must be calibrated for bending lift and qualified within their validity period. According to standards including JB/T 5416-2017 "Technical Conditions for Small Diesel Engine Direct Coupled Water Pump Units", GB/T 3216-20
2. Biographical Contributions of Shi Shaoxi
Shi Shaoxi has made significant contributions in the field of diesel engines, including
1. Deriving the equation for the motion trajectory of particles in the cylinder vortex and proposing the principle of the formation of the surrounding mixed airflow
2. Invented the theory of thermal mixing in diesel engines
3. Established the velocity distribution equation for periodic pulsating flow and obtained the dimensionless formula for its frequency influence, solving the long-standing theoretical and design problems of laminar flow meters
4. Successfully researched and developed Chinas first high-speed diesel engine with a speed of 3000 revolutions per minute or above.
5. Established a major in internal combustion engines in universities, laying the foundation for higher education in internal combustion engines in China, along with the first two-stage free piston engine compressor The invention of composite combustion system has solved the dilemma in the development of small and medium-sized high-speed diesel engines in China. 9. Significant achievements have been made in the research of methanol as an alternative fuel for internal combustion engines. 10. Compile monographs and large-scale reference books, including the "Design Manual for Mengbo Diesel Engine" and the "Design Manual for Internal Combustion Engine Spring". 11. Participated in the planning of scientific and technological development in various periods of our country, and made contributions to the development of science and technology in our country.
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