公开(公告)号：US20190338785A1

公开(公告)日：2019-11-07

申请号：US16510622

申请日：2019-07-12

Applicant: Johnson Controls Technology Company

Inventor： Steven T. Sommer ,  Jeb W. Schreiber ,  Justin P. Kauffman ,  Kurt F. Nenstiel (Deceased)

IPC: F04D29/46 ,  F04D27/02

Abstract: 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.

公开(公告)号：US09395111B2

公开(公告)日：2016-07-19

申请号：US14423472

申请日：2013-10-23

Applicant: JOHNSON CONTROLS TECHNOLOGY COMPANY

Inventor： Steven T. Sommer ,  Jeb W. Schreiber ,  Steven J. Estes

IPC: F25B31/00 ,  H02K11/00 ,  H02K5/20 ,  H02K7/09 ,  H02K9/10 ,  H02K9/20 ,  F04D29/058 ,  F04D29/58 ,  F04D25/06

CPC classification number: F25B31/008 ,  F04D25/06 ,  F04D29/058 ,  F04D29/5806 ,  F04D29/584 ,  H02K5/20 ,  H02K7/09 ,  H02K9/10 ,  H02K9/20 ,  H02K11/00

Abstract: A method for cooling a compressor motor (170) and a cooling circuit utilizing refrigerant that originates in the condenser (30) to cool a motor (170) and electromagnetic bearings (196, 206). The motor drives a compressor (20), while the electromagnetic bearings support the motor rotor (178) during operation of the compressor. Liquid refrigerant from the condenser is expanded into a two-phase mixture, passed over the stator, expanded a second time, passed over the bearings and between the stator and rotor, before being returned to an evaporator (50).

Abstract translation: 一种利用来自冷凝器（30）的制冷剂来冷却电动机（170）和电磁轴承（196,206）的压缩机电动机（170）和冷却回路的冷却方法。 电动机在压缩机运行期间驱动压缩机（20），同时电磁轴承支撑电机转子（178）。 来自冷凝器的液体制冷剂膨胀成两相混合物，通过定子，第二次膨胀，在轴承之间和定子与转子之间经过，然后返回到蒸发器（50）。

公开(公告)号：US11092166B2

公开(公告)日：2021-08-17

申请号：US16510622

申请日：2019-07-12

Applicant: Johnson Controls Technology Company

Inventor： Steven T. Sommer ,  Jeb W. Schreiber ,  Justin P. Kauffman ,  Kurt F. Nenstiel

IPC: F04D29/46 ,  F04D27/02 ,  F04D29/058

Abstract: 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.

公开(公告)号：US10378553B2

公开(公告)日：2019-08-13

申请号：US14368330

申请日：2013-11-04

Applicant: JOHNSON CONTROLS TECHNOLOGY COMPANY

Inventor： Steven T. Sommer ,  Jeb W. Schreiber ,  Justin P. Kauffman ,  Kurt F. Nenstiel

IPC: F04D29/46 ,  F04D27/02 ,  F04D29/058

Abstract: 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.

公开(公告)号：US20140328667A1

公开(公告)日：2014-11-06

申请号：US14368330

申请日：2013-11-04

Applicant: Susan J. NENSTIEL ,  JOHNSON CONTROLS TECHNOLOGY COMPANY

Inventor： Steven T. Sommer ,  Jeb W. Schreiber ,  Justin P. Kauffman ,  Kurt F. Nenstiel (Deceased)

IPC: F04D29/46

CPC classification number: F04D29/464 ,  F04D27/0253 ,  F04D29/058 ,  F05D2250/52

Abstract: 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.

Abstract translation: 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，瞬时浪涌和失速也可以有效地消除，因为当负载和叶轮速度增加时，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下引起的问题。 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。