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Bearing performance for compressors using high energy refrigerants with sulfur-based oil additives

A bearing performance, compressor technology, used in refrigerators, compressors, components of pumping devices for elastic fluids, etc. wear and tear

Active Publication Date: 2016-07-13
EMERSON CLIMATE TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Higher temperatures cause more potential problems in the HVACR system, including further reduction in the viscosity of the lubricant oil, thermal expansion of mating surfaces, and overall damage and wear to bearings within the compressor

Method used

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  • Bearing performance for compressors using high energy refrigerants with sulfur-based oil additives
  • Bearing performance for compressors using high energy refrigerants with sulfur-based oil additives
  • Bearing performance for compressors using high energy refrigerants with sulfur-based oil additives

Examples

Experimental program
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Effect test

Embodiment

[0073] Forty machined plain bearings, including 20 conventional bearings with lead particles and 20 lead-free bearings according to certain aspects of the present disclosure, were compared by simulated early bearing performance bench testing. The bearings are typical compressor production plain bearings, consisting of a copper-bronze base with a polytetrafluoroethylene (PTFE) polymer matrix which has been machined along its surface. The 20 conventional bearings had a PTFE matrix with lead particles, while the 20 lead-free bearings had molybdenum disulfide particles in a PTFE polymer matrix. The test was performed in the presence of a polyol ester oil containing about 0.25% by weight of the oil of a sulfur additive ( 826). The oil was a mixed acid polyol ester oil (POE) with a viscosity of about 32 cSt at 40°C. The bench tests performed here were short, but partially simulated and mimicked some realistic bearing conditions in order to be able to compare the different bearing...

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PUM

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Abstract

Methods for improving bearing performance in compressors, especially for those that use high energy refrigerants or that have a high-side design, are provided. The compressor comprises a bearing that is substantially free of lead. The bearing comprises copper and at least one lubricant particle type selected from a group consisting of: molybdenum disulfide (MoS2), calcium fluoride (CaF2), tungsten disulfide (WS2), zinc sulfide (ZnS), hexagonal boron nitride, polytetrafluoroethylene (PTFE), carbon fiber, graphite, graphene, carbon nanotubes, carbon particles, thermoset polyimide, and combinations thereof. The compressor processes a high energy refrigerant and a lubricant oil comprising a sulfur-based additive. The sulfur-based additive reacts with the copper in the bearing to enhance lubricity and improve performance of the bearing in the compressor machine. Compressors having such features and improved bearing performance are also contemplated.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Patent Application No. 14 / 551,814, filed November 24, 2014, and also claims the benefit of US Provisional Application No. 61 / 909,501, filed November 27, 2013. The entire disclosure of the above application is incorporated herein by reference. technical field [0003] The present disclosure relates to improving bearing performance in compressors, especially compressors using high energy refrigerants, through the use of sulfur based oil additives. Background technique [0004] This section provides background information related to the present disclosure which is not necessarily prior art. [0005] A variety of refrigerants have been used in refrigeration systems including compressors such as scroll compressors or reciprocating compressors. Although some halocarbons are widely used as refrigerants; however, many of these refrigerants have a high global warming potential (a relativ...

Claims

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Application Information

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IPC IPC(8): F16C33/12F04B39/00F04C29/00
CPCF25B2400/07F25B2400/121F01D25/16F01D25/18F05D2300/172F16C2204/10F16C33/109F16C33/1095F16C33/121F16C33/122F16C2362/52F04C2210/263F04C2270/16F05C2225/04F04C2240/54F05C2251/14F16C2360/42F16C33/206F16C2208/32C10M171/008C10M2207/2835C10M2219/066C10M2219/082C10M2219/086C10M2219/104C10M2219/106F25B31/00C10N2020/097C10N2040/02C10N2040/30C10N2050/14
Inventor 马克·J·斯坎卡勒罗
Owner EMERSON CLIMATE TECH INC
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