In order to assess the structural strength of the rocket tank under low temperature environment,a low temperature filling and pressurization test system was developed.The liquid level is measured by the low temperature vortex flowmeter.The internal liquid level is measured by the temperature sensors on the tank wall.The combination of the room temperature pressure sensor and the pressure measuring tube is used to realize the low temperature Pressure measurement.By connecting the buffer tank in series after the test tank,the problem of pressure fluctuation caused by liquid nitrogen vaporization and low temperature nitrogen condensation is solved.The control system which takes the programmable controller as the core has both the remote manual control and automatic control modes.In accordance with the needs of the process,low temperature liquid nitrogen filling and pressurization test is achieved by controlling the switch valve and proportional valve.During the test,mutual communication with other acquisition and control equipment can be achieved,improving the level of automa-tion,reducing the test post and the risk of the test.The system has completed a series of low temperature tests,ensuring the smooth devel-opment and successful launch of the new generation of carrier rockets.%为了考核火箭贮箱在低温环境下的结构强度,研制了低温加注增压试验系统;通过低温涡街流量计测得的液氮流量计算得到加注量,通过试验贮箱箱壁的温度传感器测量得到内部液位,采用常温压力传感器和测压管的组合方式低成本地实现了低温压力的测量;通过在试验贮箱后级串联缓冲罐,解决了由于液氮汽化和低温氮气冷凝造成的压力波动大不易控制问题;以可编程控制器为核心的控制系统具备远程手动控制和自动控制两种模式,按照工艺需求,通过控制开关阀和比例调节阀实现低温液氮加注和增压试验;试验过程中,可以实现与其他采集和控制设备的相互通信,提高了自动化水平,减少了试验岗位,降低了试验风险;该系统完成了一系列低温试验,保证了新一代运载火箭的顺利研制和成功发射.
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