1 陈江平 上海交通大学制冷研究所 辅助设备 《制冷原理与装置》讲义 1、辅助设备有哪些？ 1.1氟利昂螺杆冷水机组组成 1.2 制冷系统及其辅助设备 2 – 气液分离器 – 油分离器 – 干燥过滤器 – 贮液器 – 集油器：氨制冷系统用 – 不凝气体分离器：低温制冷系统用 – 回热热交换器：氟利昂系统用 – 中间冷却器：双级压缩用 – 安全装置 2 2.1 气液分离器 高温液体 去膨胀阀 2.1 气液分离器 冷凝器 蒸发器 q 0 q k w c 压缩机 膨胀阀 高温蒸汽高温液体 低温液汽混合物 低温蒸汽 气液分离器 2.2 油分离器 填料式 过滤式 进气 进气 出气 2.3 干燥过滤器 The filter-drier may not be glamorous, but it is critical Filter-driers differ based on the type of desiccant that is used 3 2.4 贮液器 )稳定制冷剂循环量 )小容量机组和采用干式蒸发器的氟利昂系统不需要 2.5 空气分离器： 低温系统安装 低温氨液进 氨液出 回气 混合气进 放空气口 空调制冷系 统压力高于 大气压，可 直排放接 2.6 集油器： 氨系统安装 2.7 回热热交换器： 氟利昂系统安装 TEV 2.8 中间冷却器 氟利昂双级压缩用 氨双级压缩用 气体 高压液体 低压 气体 一次节 流液体 2.8 中间冷却器 蒸发器 高压 压缩机 膨胀阀 中间 冷却器 冷凝器 低压 压缩机 1 2 2' 3 4 4' 5 5' 膨胀阀 4 2.9 视镜 Sight glasses The sight glass shows oil condition, refrigerant charge and subcooling. The indicator shows evencthe smallest amount of water in the system. Flare or solder connection. 2.10压力控制器 Pressure controls 2.11 温度控制器 Thermostats Condensing pressure regulators Differential pressure controls Modulating pressure and temperature regulators Electronic expansions valve thermostat 5 A typical suction pressure-regulating valve Three types of suction pressure-regulating valves are used—suction throttling valve (STV), evaporator pressure regulators (EPR), or pilot-operated absolute valve (POA), developed by General Motors Corporation. These valves, in most cases, are adjustable. The POA valve uses a sealed pressure element that maintains a constant pressure independent of the altitude of the vehicle. There are two basic types of metering devices built into a single container—the VIR (Valves-In-Receiver) and the EEVIR (Evaporato Equalized Valves-In-Receiver). These units combine the POA valve, receiver-drier, thermostatic expansion valve, and sight glass into a single unit. The VIR assembly is mounted next to the evaporator, which eliminates the need for an external equalizer line between the thermostatic expansion valve and the outlet of the POA valve. The equalizer function is carried out by a drilled hole (equalizer port) between the two-valve cavities in the VIR housing.