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    • 4. 发明申请
    • CENTRIFUGAL COMPRESSOR WITH EXTENDED OPERATING RANGE
    • 离心式压缩机具有扩展的操作范围
    • WO2014120335A1
    • 2014-08-07
    • PCT/US2013/073020
    • 2013-12-04
    • DANFOSS TURBOCOR COMPRESSORS B.V.
    • BRASZ, JoostRASMUSSEN, Mogens
    • F04D17/08
    • F04D27/009F04D17/122F04D27/0215F04D27/0238F04D29/444F05D2250/52F25B1/053F25B1/10F25B2600/0253F25B2600/0262Y02B30/741
    • This disclosure relates to a centrifugal compressor. In a first example, the compressor includes a first impeller provided in a main refrigerant flow path, a second impeller provided in the main refrigerant flow path downstream of the first impeller, and a recirculation flow path. In the first example, the recirculation flow path is provided between a first location and a second location along the main refrigerant flow path. The first location is downstream of the second location, and the second location is downstream of the first impeller. In a second example, the compressor includes an impeller provided in a main refrigerant flow path, and a recirculation flow path provided between a first location and a second location along the main refrigerant flow path. In the second example, the recirculation flow path includes a recirculation volute. Further disclosed is a method for operating a centrifugal compressor.
    • 本公开涉及一种离心式压缩机。 在第一示例中,压缩机包括设置在主制冷剂流路中的第一叶轮,设置在第一叶轮下游的主制冷剂流路中的第二叶轮和再循环流路。 在第一示例中,再循环流动路径设置在沿着主制冷剂流动路径的第一位置和第二位置之间。 第一位置在第二位置的下游,第二位置在第一叶轮的下游。 在第二示例中,压缩机包括设置在主制冷剂流动路径中的叶轮和设置在沿着主制冷剂流动路径的第一位置和第二位置之间的再循环流动路径。 在第二示例中,再循环流动路径包括再循环蜗壳。 进一步公开了一种操作离心式压缩机的方法。
    • 10. 发明申请
    • HIGH PRESSURE RATIO MULTI-STAGE CENTRIFUGAL COMPRESSOR
    • 高压比多级离心压缩机
    • WO2013133832A2
    • 2013-09-12
    • PCT/US2012/028221
    • 2012-03-08
    • DANFOSS TURBOCOR COMPRESSORS B.V.SUN, LinBRASZ, Joost
    • SUN, LinBRASZ, Joost
    • F25B30/02
    • F25B30/02F04D17/122F04D25/06F04D27/002F04D27/004F04D29/048F04D29/462F25B1/053F25B1/10F25B13/00F25B41/046F25B2600/0253Y02B30/741
    • A heat pump system includes a refrigerant circuit. First and second heat exchangers are arranged in the refrigerant circuit. A flow reversing device selectively changes a direction of flow in the refrigerant circuit between the first and second heat exchangers. A centrifugal compressor is arranged in the fluid circuit and has first and second impellers arranged in series relative to one another to provide a desired compressor pressure ratio. In one example, the centrifugal compressor mounts the first and second impellers on opposing ends of a shaft. The first and second impellers respectively include first and second stage inlets and outlets. One example desired compressor pressure ratio of at least 10:1 corresponds to a second stage outlet pressure to a first stage inlet pressure. A first diffuser is arranged at the first stage outlet, and the first diffuser is a variable geometry diffuser.
    • 热泵系统包括制冷剂回路。 第一和第二热交换器布置在制冷剂回路中。 逆流装置选择性地改变第一和第二热交换器之间的制冷剂回路中的流动方向。 离心压缩机布置在流体回路中,并且具有相对于彼此串联布置的第一和第二叶轮以提供期望的压缩机压力比。 在一个示例中,离心式压缩机将第一和第二叶轮安装在轴的相对端上。 第一和第二叶轮分别包括第一和第二台入口和出口。 至少10:1的所需压缩机压力比的一个示例对应于第二级出口压力到第一级入口压力。 第一扩散器布置在第一级出口处,并且第一扩散器是可变几何形状扩散器。