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发明公开
CN104930761A 超低温制冷机及超低温制冷机的控制方法 有权

超低温制冷机及超低温制冷机的控制方法
摘要：
本发明提供一种提前检测超低温制冷机中的膨胀器的驱动部的故障的技术。本发明的超低温制冷机(100)中，膨胀器(10)使制冷剂气体膨胀来产生寒冷。压缩机(1)对从膨胀器(10)回流的制冷剂气体进行压缩。配管(7)与膨胀器(10)及压缩机(1)相连接，并使制冷剂气体在膨胀器(10)与压缩机之间流通。判定器(76)判定配管(7)中流过的制冷剂气体的压力变动周期是否在规定范围内。判定器(76)也可以判定低压制冷剂气体从膨胀器(10)朝向压缩机(1)流过的低压配管中的压力的变动周期是否在规定范围内。
摘要（英）：

The invention provides a technology for early detection of a malfunction of a driving unit of an expander in a cryogenic refrigerator. The expander (10) generates cold by expanding a refrigerant gas in a cryogenic refrigerator. A compressor (1) compresses the refrigerant gas returning from the expander (10). Pipes (7) are connected to the expander (10) and the compressor (1) and circulate the refrigerant gas between the expander (10) and the compressor. A determiner (76) determines whether or not a change cycle of the pressure of the refrigerant gas flowing in the pipes (7) is in a predetermined range. The determiner (76) may determine whether or not the change cycle of the pressure of a low-pressure pipe in which a low-pressure refrigerant gas flows toward the compressor (1) from the expander (10) is in a predetermined range.

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