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    • 1. 发明申请
    • VARIABLE GEOMETRY DIFFUSER HAVING EXTENDED TRAVEL AND CONTROL METHOD THEREOF
    • 具有扩展行驶的可变几何扩散器及其控制方法
    • WO2014074448A1
    • 2014-05-15
    • PCT/US2013/068279
    • 2013-11-04
    • JOHNSON CONTROLS TECHNOLOGY COMPANY
    • SOMMER, Steven, T.SCHREIBER, Jeb, W.KAUFFMAN, Justin, P.NENSTIEL, Kurt, F.
    • F04D29/46F04D27/02
    • F04D29/464F04D27/0246F04D27/0253F04D29/058
    • An improved variable geometry diffuser (VGD) mechanism for use with a centrifugal compressor. This VGD mechanism extends substantially completely into the diffuser gap so that the VGD mechanism may be used more fully to control other operational functions. The VGD mechanism may be used to minimize compressor backspin and associated transient loads during compressor shut down by preventing a reverse flow of refrigerant gas through the diffuser gap during compressor shutdown, which is prevented because the diffuser gap is substantially blocked by the full extension of the diffuser ring. During start-up, transient surge and stall also can be effectively eliminated as gas flow through the diffuser gap can be impeded as load and impeller speed increase, thereby alleviating the problems caused by startup loads at low speeds. The VGD mechanism can be used for capacity control as well so as to achieve more effective turndown at low loads.
    • 用于离心压缩机的改进的可变几何扩散器(VGD)机构。 该VGD机构基本上完全扩展到扩散器间隙中,使得VGD机构可以被更全面地用于控制其他操作功能。 VGD机构可以用于在压缩机关闭期间通过防止制冷剂气体在压缩机关闭期间通过扩散器间隙的反向流动来最小化压缩机关闭期间的压缩机反向旋转和相关联的瞬态负载,这是由于扩散器间隙基本上被 扩散器环。 在启动过程中,瞬时浪涌和失速也可以有效地消除,因为随着负载和叶轮速度的增加,通过扩散器间隙的气体流动可能受到阻碍,从而减轻了起动负载在低速时引起的问题。 VGD机构也可以用于容量控制,以便在低负载下实现更有效的调节。
    • 5. 发明公开
    • VARIABLE GEOMETRY DIFFUSER HAVING EXTENDED TRAVEL AND CONTROL METHOD THEREOF
    • VARIABLER GEOMETRIE DIFFUSOR MIT ERWEITERTER REISE,SOWIEZUGEHÖRIGESBETRIEBSVERFAHREN
    • EP2839167A1
    • 2015-02-25
    • EP13799142.8
    • 2013-11-04
    • Johnson Controls Technology Company
    • SOMMER, Steven, T.SCHREIBER, Jeb, W.KAUFFMAN, Justin, P.NENSTIEL, Kurt, F.
    • F04D29/46F04D27/02
    • F04D29/464F04D27/0246F04D27/0253F04D29/058
    • An improved variable geometry diffuser (VGD) mechanism for use with a centrifugal compressor. This VGD mechanism extends substantially completely into the diffuser gap so that the VGD mechanism may be used more fully to control other operational functions. The VGD mechanism may be used to minimize compressor backspin and associated transient loads during compressor shut down by preventing a reverse flow of refrigerant gas through the diffuser gap during compressor shutdown, which is prevented because the diffuser gap is substantially blocked by the full extension of the diffuser ring. During start-up, transient surge and stall also can be effectively eliminated as gas flow through the diffuser gap can be impeded as load and impeller speed increase, thereby alleviating the problems caused by startup loads at low speeds. The VGD mechanism can be used for capacity control as well so as to achieve more effective turndown at low loads.
    • 一种用于离心式压缩机的改进的可变几何扩散器(VGD)机构。 该VGD机构基本上完全扩展到扩散器间隙中,使得可以更全面地使用VGD机构来控制其他操作功能。 VGD机构可以用于在压缩机关闭期间通过防止制冷剂气体在压缩机关闭期间通过扩散器间隙的反向流动来最小化压缩机反向旋转和相关联的瞬时负载,这是由于扩散器间隙基本上被 扩散器环。 在启动过程中,由于负载和叶轮速度的增加可能会阻碍通过扩散器间隙的气体流动,因此可以有效地消除瞬态浪涌和失速,从而减轻低速启动负载引起的问题。 VGD机构也可用于容量控制,以便在低负载下实现更有效的调节。