Cascade low-temperature side refrigerant double-channel bypass pressure relief structure

The utility model discloses a cascade low-temperature side refrigerant double-channel bypass pressure relief structure. One side of a condenser is connected with the upper part of an oil separator A and the upper part of an oil separator B in sequence; the other side of the condenser is connected with one end of a condensation evaporator B; the lower part A and the lower part B of the oil separator A are output, the path A is connected with the lower part of the oil separator B, and the path B is connected with the lower part of the expansion container; the upper part of the oil separator B isoutput by three paths C, D and E, the path C is connected with the upper part of the expansion container, the path D is connected with a high-pressure sensor, the path E is output by two paths F andG, the path F is connected with the left part of the liquid accumulator A through a mechanical pressure relief valve, and the path G is connected with the top of the liquid accumulator A through a pressure relief electromagnetic valve. The pressure relief bypass device is reasonable in design, ensures that the unit is not overpressure by adopting a pressure relief bypass mode, can quickly balancethe pressure difference in operation, improves the balance efficiency of shutdown and restart of the unit, can meet the pressure relief requirements under various emergency conditions, and ensures thesafe and stable operation of the refrigerating unit. 一种复叠式低温侧制冷剂双通道旁通卸压结构，冷凝器的一侧依次通过油分离器A的上部、油分离器B的上部连接；冷凝器的另一侧与冷凝蒸发器B的一端连接；油分离器A的下部分A、B两路输出，A路与油分离器B的下部连接，B路与膨胀容器的下部连接；油分离器B的上部分C、D、E三路输出，C路与膨胀容器的上部，D路连接有高压传感器，E路又分F、G两路输出，F路通过机械卸压阀与储液器A的左部连接，G路通过卸压电磁阀与储液器A的顶部连接。本实用新型设计合理，采用卸压旁通方式保证机组不过压，能快速平衡运行中的压差，提高了机组停机再启动的平衡效率，能应对各种紧急情况下的卸压需要，保证了制冷机组安全稳定工作。