Johnson Controls Technology Company

Johnson Controls Tyco IP Holdings Llp

Steven Trent Sommer

Jeb William Schreiber

Gregory Keith Beaverson

Steven J Estes

John C Hansen

Justin Patrick Kauffman

Andrew Michael Welch

Florin Valcriu Iancu

Kurt F Nenstiel

Eric John Smyder

John Trevino, Jr

Rudy Chervil

Curtis Christian Crane

Ivan Jadric

John Francis Judge

Robert E Stabley

Stephen Harold Smith

Patrick Christian Marks

Koman B Nambiar

Jr John Trevino

A control system is provided that can identify the occurrence of a single surge cycle in centrifugal compressor using various methods and devices. Once the occurrence of a single surge cycle is identified, the control system can take remedial action to respond to the surge cycle, such as by adjusting the position of a variable geometry diffuser, and restore the centrifugal compressor to stable operation.

Control system for centrifugal compressor

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.

Variable geometry diffuser having extended travel and control method thereof

An economized refrigeration system includes a main refrigerant circuit having a condenser, an evaporator, an economizer, an expansion device intermediate the condenser and the economizer, and a main compressor fluidly connected by a main refrigerant line. The system also includes an economized refrigerant circuit including an auxiliary compressor system and an auxiliary refrigerant line fluidly connecting the economizer to the auxiliary compressor system and fluidly connecting the main refrigerant line to the auxiliary compressor at a location intermediate the main compressor system and the condenser. The auxiliary compressor system is independently controllable with respect to the main compressor system.

Economized refrigeration system

A method for cooling a compressor motor () and a cooling circuit utilizing refrigerant that originates in the condenser () to cool a motor () and electromagnetic bearings (). The motor drives a compressor (), while the electromagnetic bearings support the motor rotor () 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 ().

Motor cooling method for a compressor

A system for controlling a centrifugal gas compressor () in an HVAC, refrigeration or liquid chiller system () in which flow of gas through the compressor is automatically controlled to maintain desired parameters within predetermined ranges so as to prevent stall and surge conditions within the system. A variable geometry diffuser () in the compressor controls the refrigerant gas flow at the discharge of the compressor impeller wheel (). This arrangement reduces mass flow, decrease/eliminate flow-reducing stall, and increases the operating efficiency of the compressor at partial load conditions. The variable geometry diffuser control in combination with a variable speed drive (VSD) () increases the efficiency of the compressor at partial system loads, and eliminates the need for pre-rotation vanes at the inlet of the centrifugal compressor.

Compressor control system using a variable geometry diffuser

A cooling system for a motor powering a compressor in a vapor compression system includes a housing and a cavity within the housing. A first fluid circuit has a first connection to receive a refrigerant into the cavity, and a second connection to deliver refrigerant from the cavity to a heat exchanger for a heat transfer relationship with a heat-generating component.

Motor cooling applications

A cooling system for a motor powering a compressor in a vapor compression system includes a housing enclosing the motor and a cavity located within the housing. A fluid circuit circulates a cooling fluid in the motor, and includes a first connection in the housing to receive cooling fluid and a second connection in the housing to remove cooling fluid. The fluid circuit includes a passageway for cooling fluid positioned in an internal chamber formed in a motor shaft.

A motor coolant method and system is used to cool a compressor motor () in a refrigeration system having a multi-stage compressor (). The compressor includes a first compressor stage () and a second compressor stage (), the first compressor stage providing compressed refrigerant to an input of the second compressor stage. The motor coolant system has a first connection with the refrigerant loop to receive refrigerant into the motor cavity for cooling, the received refrigerant provided from a system component having a high pressure, and a second connection with the refrigerant loop to return refrigerant to an intermediate pressure greater than an evaporator operating pressure. The pressure inside the motor cavity may be approximately the pressure within the first stage discharge and second stage suction to minimized seal leakage between the motor cavity and the internal pressures of the first and second stage compressors.

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York, PA, United States of America

Steven Trent Sommer