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发明公开
CN104541115A 二元制冷装置 有权

二元制冷装置
摘要：
一种二元制冷装置，包括：高元制冷循环(20)，其利用配管连接高元侧压缩机(21)、高元侧冷凝器(22)、高元侧膨胀阀(23)以及高元侧蒸发器(24)，并构成高元侧制冷剂回路；低元制冷循环(10)，其利用配管连接低元侧压缩机(11)、低元侧冷凝器(12)、低元侧贮液器(13)、低元侧膨胀阀(14)以及低元侧蒸发器(15)，并构成低元侧制冷剂回路；级联冷凝器(30)，其具有高元侧蒸发器(24)与低元侧冷凝器(12)；贮液器热交换部(25)，其用于将低元侧贮液器(13)冷却；以及高元制冷循环控制器(32)，若在低元侧压缩机(11)停止的过程中，基于低元侧制冷剂的压力推断为低元侧制冷剂到达超临界状态，则进行使高元侧压缩机(21)起动这样的控制。
摘要（英）：

This cascade refrigeration equipment is provided with: a high-temperature refrigeration circuit (20) constituting a high-temperature-side refrigerant circuit wherein pipes connect a high-temperature-side compressor (21), a high-temperature-side condenser (22), a high-temperature-side expansion valve (23) and a high-temperature-side evaporator (24); a low-temperature refrigeration circuit (10) constituting a low-temperature-side refrigerant circuit wherein pipes connect a low-temperature-side compressor (11), a low-temperature-side condenser (12), a low-temperature-side liquid receiver (13), a low-temperature-side expansion valve (14) and a low-temperature-side evaporator (15); a cascade condenser (30) containing the high-temperature-side evaporator (24) and the low-temperature-side condenser (12); a liquid receiver heat exchanging unit (25) that cools the low-temperature-side liquid receiver (13); and a high-temperature refrigeration circuit controller (32) that activates the high-temperature-side compressor (21) when it is estimated, on the basis of the pressure of a low-temperature-side refrigerant, that the low-temperature-side refrigerant is in a supercritical state while the low-temperature-side compressor (11) is stopped.

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