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中性束注入器用液氦低温冷凝泵抽气性能的主要影响因素是低温冷凝抽气面温度,单位时间进气量和被冷凝的气体总量。本文采用流量计法抽速测试装置;同时依据液氦温度与其饱和蒸汽压之间的变化规律,系统中采用了氦气出气压力控制单元,通过调节液氦杜瓦内压力改变液氦的温度从而实现控制液氦低温冷凝面温度;且采用压电晶体阀对单位时间进气量以及被冷凝气体总量进行精确控制;使用ZJ-12型B-A规测量测试装置内真空度。设计了仿真中性束注入器用的低温冷凝泵的测试泵,对其进行ANSYS热力学分析,从而计算出该泵的低温冷凝面积。加工组装了测试平台,并在中性束注入器的工作条件下进行实验,得到测试泵的对氢抽速为940 L/s,表明该系统能够满足测试要求,为中性束注入器低温冷凝泵设计提供实验和理论依据。
Neutral beam injector with liquid helium cryogenic condensate pump suction performance of the main factors affecting the low temperature condensate suction surface temperature, intake per unit time and the total amount of gas to be condensed. In this paper, the flow rate method pumping speed test device; at the same time based on the liquid helium temperature and its saturated vapor pressure variation between the system uses a helium gas outlet pressure control unit, by adjusting the liquid helium Dewar pressure to change the temperature of liquid helium Control the liquid helium low temperature condensation surface temperature; and the use of piezoelectric crystal valve on the unit of time the amount of air as well as the total amount of condensate gas to be precisely controlled; the use of ZJ-12 BA gauge measuring the vacuum degree within the test device. A test pump for simulating a low temperature condensate pump used in a neutral beam injector was designed and subjected to ANSYS thermodynamic analysis to calculate the low temperature condensing area of the pump. The test platform was assembled and processed under the working conditions of a neutral beam injector to obtain a hydrogen pumping speed of 940 L / s for the test pump, indicating that the system was able to meet the test requirements for cryogenic condensation of neutral beam injectors Pump design to provide experimental and theoretical basis.