Abstract
The rolling piston type rotary compressor has been widely used for refrigeration and air-conditioning systems due to its compactness and high-speed operation. The present analysis is part of a research program directed toward maximizing the advantages of refrigerant compressors. The study of lubrication characteristics in the critical sliding component is essential for the design of refrigerant compressors. Therefore, theoretical investigation of the lubrication characteristics of a rotary compressor being used for refrigeration and air-conditioning systems was investigated. The Newton-Raphson method was used for a partial elastohydrodynamic lubrication analysis between the vane and the rolling piston of a rotary compressor. The results demonstrated that the vane thickness and the center line position of the vane significantly influenced the friction force and the energy loss between the vane and the rolling piston.
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Abbreviations
- e :
-
Eccentric length
- E’:
-
Equivalent Young’s modulus
- f :
-
Friction force per unit length
- h :
-
Film thickness at arbitraryx
- h m :
-
Film thickness at dp/dx=0
- h o :
-
Film thickness at x=0
- N :
-
Number of asperities per unit area
- O :
-
Center of the cylinder
- O p :
-
Center of the rolling piston
- O v :
-
Center of the vane tip
- p :
-
Pressure at arbitraryx
- P b :
-
Pressure of suction chamber
- p c :
-
Contact pressure
- P ∞ :
-
Pressure of compression chamber
- P d :
-
Discharge pressure
- p h :
-
Hydrodynamic pressure
- P s :
-
Suction pressure
- R :
-
Equivalent radius of the contact
- R c :
-
Radius of the cylinder
- r i :
-
Inner radius of the rolling piston
- r o :
-
Outer radius of the rolling piston
- u= (u1+u2)/2:
-
Average sliding velocity
- v :
-
Elastic normal displacement
- w :
-
Load per unit length
- x :
-
Coordinates
- x a :
-
Location where pressure is generated
- x b :
-
Location where the film is broken
- X v :
-
Displacement of the vane
- α:
-
Pressure-viscosity coefficient
- αp :
-
Eccentric angle of rolling piston center
- β:
-
Mean radius of curvature of the asperities
- γ:
-
Surface pattern parameter
- Ψh :
-
Pressure flow factor
- η:
-
Viscosity of lubricant
- ηo :
-
Viscosity of lubricant at ambient pressure
- σ:
-
Standard deviation of roughness amplitude
- θ:
-
Rotational angle of the eccentric shaft
- ω:
-
Angular velocity of the eccentric shaft
- ωp :
-
Angular velocity of the rolling piston
References
Cho, I. S., Oh, S. H. and Jung, J. Y., 1996, “The Lubrication Characteristics of Rotary Compressor for Refrigeration & Air-Conditioning (Part I; The analysis of rolling piston behavior),”Journal of KSTLE, Vol. 12, No. 4, pp. 43–51.
Cho, I. S., Oh, S. H. and Jung, J. Y., 2001, “Lubrication Characteristics Between the Vane and the Rolling Piston in a Rotary Compressor Used for Refrigeration and Air-Conditioning Systems,”KSME International Journal, Vol. 15, No. 5, pp. 562–568. (Korea)
Greenwood, J. A. and Tripp, J. H., 1971, “The Contact of Two Nominally Flat Rough Surfaces,”Proceedings of The Institution of Mechanical Engineers Part I, Vol. 185, No. 48, pp. 625–633.
Patir, N. and Cheng, H. S., 1979, “Application of Average Between Rough Sliding Surfaces,”ASME Journal of Lubrication Technology, Vol. 101, pp. 220–230.
Prakash, J. and Czichos, H., 1983, “Influence of Surface Roughness and Its Orientation on Partial Elastohydrodynamic Lubrication of Rollers,”ASME Journal of Lubrication Technology, Vol. 105, pp. 591–597.
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Cho, IS., Jung, JY. The Influence of the vane on the lubrication characteristics between the vane and the rolling piston of a rotary compressor. J Mech Sci Technol 20, 2242–2249 (2006). https://doi.org/10.1007/BF02916341
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DOI: https://doi.org/10.1007/BF02916341