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    • 2. 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。
    • 4. 发明申请
    • VARIABLE-SPEED OIL-FREE REFRIGERANT CENTRIFUGAL COMPRESSOR WITH VARIABLE GEOMETRY DIFFUSER
    • 具有可变几何差速器的可变速无油冷冻离心式压缩机
    • WO2012087306A1
    • 2012-06-28
    • PCT/US2010/061754
    • 2010-12-22
    • DANFOSS TURBOCOR COMPRESSORS B.V.SUN, LinBRASZ, Joost
    • SUN, LinBRASZ, Joost
    • F04D29/44
    • F04D15/00F04D29/444F04D29/462F04D29/464F05D2250/52
    • A refrigerant compressor includes a housing providing a refrigerant outlet having a throat. An electric motor is provided in the housing to directly drive an impeller via a shaft about an axis in response to a variable speed command. The impeller includes an outlet end aligned with variable geometry diffuser. A magnetic bearing assembly rotationally supports the shaft relative to the housing in response to a magnetic bearing command. A member is arranged to adjust the throat area, and which can move in a direction generally parallel to the axis in response to an actuator receiving a compressor regulation command. A controller is configured to respectively provide the variable speed command, the magnetic bearing command and the compressor regulation command to the electric motor to vary throat area, the magnetic bearing assembly and the actuator to obtain a desired compressor operation without the need of variable inlet geometry.
    • 制冷剂压缩机包括提供具有喉部的制冷剂出口的壳体。 电动机设置在壳体中,以响应于可变速度命令经由轴绕轴线直接驱动叶轮。 叶轮包括与可变几何形状扩散器对准的出口端。 磁轴承组件响应于磁轴承指令相对于壳体旋转地支撑轴。 构件被布置成响应于接收压缩机调节命令的致动器而调节喉部区域,并且其可以在大致平行于轴线的方向上移动。 控制器被配置为分别向电动机提供变速指令,磁轴承命令和压缩机调节指令以改变喉部区域,磁轴承组件和致动器以获得期望的压缩机操作,而不需要可变入口几何形状 。