Full
Outline
To address the issues of single pumping performance diagnosis methods，limited regeneration capabilities，and insufficient testing accuracy in traditional Gifford-McMahon （GM） refrigerator cryopump test platforms，a high‑precision test platform was designed based on JB/T 11081—2011 standards.This platform integrates key data acquisition and display modules for temperature and vacuum，and innovatively introduces a thermal purge heating subsystem，while using a residual gas analyzer （RGA） to monitor real‑time pressure changes of the tested gas.Through theoretical calculations，simulation analysis，and experimental testing，the hydrogen pumping speed performance of the cryopump was validated.The results show that：the designed thermal purge device uses 100 ℃ nitrogen to purge the cryogenic surface，effectively meeting the regeneration heating requirements for flammable and explosive gases；during the test，cooling and vacuum performance remained stable without fluctuations；by collecting partial pressure changes before and after hydrogen injection，the measured average pumping speed was 4 291 L/s，with errors less than 10% compared to theoretical calculations （4 514 L/s） and simulation results （4 552 L/s），falling within the allowable error range，validating the rationality of the platform design.This platform can provide high‑precision testing methods for the performance optimization of domestic cryopumps.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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