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Method and system for rotor cooling

A technology of cooling system and refrigerant, applied in the field of vapor compression system, compressor motor cooling, which can solve the problem of increased leakage of seals

Active Publication Date: 2015-07-15
JOHNSON CONTROLS TYCO IP HLDG LLP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, by utilizing evaporator conditions for motor cooling, seal leakage in compressors may increase, especially in two-stage compressors

Method used

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  • Method and system for rotor cooling
  • Method and system for rotor cooling
  • Method and system for rotor cooling

Examples

Experimental program
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Embodiment Construction

[0019] figure 1 An exemplary environment is shown for a heating ventilation air conditioning system (HVAC system) 10 in a building 12 used in a commercial setting. System 10 may include a compressor included in vapor compression system 14 that may supply a chilled liquid that may be used to cool building 12 . System 10 may also include a boiler 16 for heating building 12 and an air distribution system for circulating air in building 12 . The air distribution system may include an air return duct 18 , an air supply duct 20 and an air handler 22 . Air handler 22 may include a heat exchanger connected by conduits 24 to boiler 16 and vapor compression system 14 . Depending on the mode of operation of system 10 , the heat exchanger in air handler 22 may receive heated liquid from boiler 16 or cooled liquid from vapor compression system 14 . The system 10 is shown with a separate air handler on each floor of the building 12, but it is understood that these components may be share...

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Abstract

A motor coolant method and system is used to cool a compressor motor (36) in a refrigeration system having a multi-stage compressor (38). The compressor includes a first compressor stage (42) and a second compressor stage (44), 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.

Description

[0001] This application claims the benefit of US Provisional Application No. 61 / 017,966, filed December 31, 2007, entitled "MHETHOD AND SYSTEM FORROTOR COOLING," which is incorporated herein by reference. Background technique [0002] The present application generally relates to systems and methods for cooling compressor motors in vapor compression systems. [0003] Hermetic motors may experience windage losses caused by friction during rotation. Windage losses adversely affect motor performance and efficiency. In order to reduce windage loss in a motor, factors directly related to the motor such as the peripheral speed of the rotor, the flow and thermodynamic state of the motor cooling gas circulating around the rotor, the area of ​​the rotor surface and the roughness of the rotor surface can be controlled degrees to reduce friction in the motor. [0004] One method for cooling the motor while reducing energy loss in the motor is to draw refrigerant towards the motor windin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B1/10F25B31/00
CPCF25B2400/13F25B1/10F25B31/006F04D29/5806F04D25/06F04D29/102
Inventor S·T·萨默
Owner JOHNSON CONTROLS TYCO IP HLDG LLP