一种提高波纹管型自调式J-T制冷器控温精度的设计及试验研究

Design and Experimental Research for Improving Temperature Control Precision of Bellows-type Self-regulating J-T Cooler

为提高波纹管型J-T制冷器的控温精度,对阀针进行了优化设计。在阀针针尖部位开槽,使其与制冷器阀体上的主节流孔形成双节流孔。制冷器开启后,工质进入主节流孔,节流降温;制冷器自调后,阀针完全堵住主节流孔,稳定小流量从针槽喷出。通过试验确定了阀针开槽的合理尺寸范围。试验结果表明,阀针开槽可以有效提高制冷器的控温精度。

In order to improve the temperature control precision of the bellows-type J-T cooler,the needle design is optimized.The tip of the needle is grooved to form double throttled holes with the main throttled hole on the valve body of the cooler.The working medium enters the main throttled hole for throttling and cooling after the start.The hole is completely blocked by the needle after self-regulating of the cooler,and the steady small flow is ejected from the groove.The reasonable size of the groove is determined.The test results show that the groove on the tip of the needle can effectively improve the temperature control precision.