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    • 7. 发明授权
    • Refrigeration passive defrost system
    • 制冷无源除霜系统
    • US5669222A
    • 1997-09-23
    • US660021
    • 1996-06-06
    • Heinz JasterDavid Joseph Najewicz
    • Heinz JasterDavid Joseph Najewicz
    • F25B41/00F25B47/02
    • F25B47/022F25B2500/01F25B41/00
    • A refrigeration system includes a compressor, a condenser, an expansion throttle, an evaporator and a control valve. All of the above elements are connected in series, in that order, in a refrigerant flow relationship. During periods in which the compressor initiates a passive defrost mode, control valve disposed within the conduit connecting the compressor and the evaporator remains open. Liquid refrigerant, by force of gravity, drains from the bottom of evaporator through the conduit to the compressor. This draining liquid refrigerant is evaporated by the hot compressor, flowing upward to the cold evaporator surfaces and condensing. The condensation releases latent heat of vaporization and heats the surface of the evaporator melting ice buildup thereon. In another embodiment, the refrigeration system further includes a bypass line connecting the compressor to the top of the evaporator. The inclusion of the bypass line allows the flow of the evaporated refrigerant to flow directly from the compressor to the evaporator through the bypass line, and the flow of liquid refrigerant to flow directly from the evaporator to the compressor through the conduit, such that no counter-current liquid and vapor flow within one conduit is required.
    • 制冷系统包括压缩机,冷凝器,膨胀节流阀,蒸发器和控制阀。 所有上述元件按照该顺序以制冷剂流动关系串联连接。 在压缩机启动无源除霜模式的期间,设置在连接压缩机和蒸发器的导管内的控制阀保持打开。 液体制冷剂通过重力作用从蒸发器底部通过导管排入压缩机。 这种排出的液体制冷剂被热压缩机蒸发,向上流动到冷蒸发器表面并冷凝。 所述冷凝物释放蒸发潜热并加热蒸发器的表面,从而在其上积聚冰块。 在另一个实施例中,制冷系统还包括将压缩机连接到蒸发器的顶部的旁通管线。 旁路管线的包含允许蒸发的制冷剂的流动通过旁路管线从压缩机直接流到蒸发器,并且液体制冷剂的流动通过管道直接从蒸发器流到压缩机,使得没有计数器 需要一个导管内的当前液体和蒸气流。