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Technical Paper

Improvement of Scroll Compressor for Vehicle Air Conditioning Systems

Mobile Air Conditioning Compressors with the scroll mechanism design are superior in noise, vibration and harshness (NVH) levels, and in efficiency. For further NVH improvements; for improved comfortability; to enhance the manufacturability to meet the increasing market volumes; and to give better vehicle compatibility in weight reduction and increased durability, the New Type TR Compressor is presented.
Technical Paper

Leakage Reduction on Seal Parts of HFC134a MAC Compressors

Typical belt-driven Mobile Air-Conditioning (MAC) compressors require durable seals between a rotating driveshaft and stationary casing in addition to casing and hose connection O-ring seals. This paper explores the experiential and theoretical relationships of HFC134a seal design and materials and also suggests possible improvements. Testing revealed that shaft and O-ring permeation comprised a large part of the total leak rate of HFC134a MAC compressors during static-state leak-rate measurements. Furthermore, testing and Taguchi statistical analysis methods clarified equations concerning permeation area, distance and leak rate. Resulting design and material improvements reduced compressor HFC134a Leak Flow Rates (LFR) by approximately fifty percent.
Technical Paper

Lubricant Screening for HFC-134a Car Air Conditioning Compressor Reliability

Certain important factors must be considered when the current refrigerant for automotive air conditioning systems, (A/C), is changed from CFC12 to the ozone safe HFC134a. This paper will focus on lubricant compatibility by presenting a screening process which will cover: a screening table of essential physical properties general information on types of available lubricants tests of chemical stability lubricity compatibility with elastomers methods for testing compressor durability service engineering
Technical Paper

Possible Compressor Problems in Handling HFC-134a Car Air Conditioning Systems

Several field problems are anticipated with HFC-134a systems. To be evaluated and clarified are the impacts upon: compressors and systems of chlorine based solvents left in the system from flushing or parts cleaning; mixing in CFC-12; mixing the new lubricants with mineral oil; the effects of certain lubricants and HFC-134a's high hygroscopicity and others. The whole industry should share information and endeavor to maintain the reliability of the new systems from a service engineering standpoint. STARTING IN 1991 the ozone safe HFC-134a refrigerant is expected to replace the conventional CFC-12 in car air conditioning systems and in model years 1994-1995 the major portion of the market will be the new systems. The components/elements and parts used in the new air conditioning systems will embody different designs with new materials which are now considered to be compatible with the new refrigerant-lubricant mixtures.
Technical Paper

Scroll Compressor Wall Strength Improvement

Scroll wall strength is of critical importance to compressor reliability and durability. This is most critical at the center portion of the scroll wall as it is exposed to the highest working gas pressure in the A/C system as well as to high discharge gas temperatures. This paper will focus on a method to achieve stress reduction at the center portion of the scroll wall by using Finite Element Methods (FEM) analysis. Scroll wall endurance was evaluated utilizing an accelerated durability test which covered the following: Optimization method of scroll wall center portion geometry. Effect of stress reduction by optimization of fillet radius. Impact of discharge gas temperature on scroll wall endurance.