渦卷式壓縮機止推軸承潤滑之液動力分析

Hydrodynamic Analysis of Thrust Bearing for Scroll Compressor

梁祥福(Siong-Hock Liong)

指導教授 ： 劉正良

共同指導教授 ： 蘇 侃(Hon So)

國立臺灣大學/工學院/機械工程學研究所/碩士(2007年)

https://doi.org/10.6342/NTU.2007.01445

摘要

渦卷式壓縮機是在80年代才商品化的產品。但因具優異的效率，加上振動小、噪音低，因此有逐漸取代其他類型壓縮機在小噸數壓縮機市場的趨勢。

此種壓縮機在運轉過程中常會遇到止推面過度磨耗的問題，造成壓縮機耗功突然昇高，除了影響效率，最終也將使壓縮機損壞。對損壞止推面的觀察時，發現在止推軸承的表面有許多磨痕。此現象乃由於壓縮機在運轉時之高負載，造成止推軸承和動渦卷的乾摩擦所造成的。

本研究針對中凸的止推軸承設計進行分析。止推軸承利用中凸形狀特性的所形成的楔形油膜，可根據雷諾方程式推導出止推軸承建立油膜的運動方程式，再利用有限差法來計算油膜的壓力分佈，積分即可得止推軸承的承載能力。

分析結果發現，中凸止推軸承在斜率為0.01時將取得最佳的負載能力以支撐動渦卷所造成之作用力。

關鍵字

渦卷壓縮機 ； 止推軸承 ； 雷諾方程式 ； 潤滑 ； 液動力

並列摘要

Although scroll compressor was not commercialized until 1980’s, but its excellent efficiency and the advantage of little vibration and low noise made scroll compressor have the possibility to replace other types of compressor on the market.

There seems to exist a problem of over adhension on thrust bearing during operating. It causes the rise of input power, thus causes the efficiency to decrease. The compressor fails to work at last.

Noting that the broken thrust bearing presents a lot of pitting on the contact surfaces. When the compressor continues to operate the pitting phenomenon extends, thus causes surface fatigue. The pitting is caused by the boundary lubrication or even dry friction during high load operation.

This work establishes Reynolds equation for tilting pad thrust bearing and then applies finite difference method to analyze pressure distribution. The summation of the pressure distribution is thus the total supporting force.

Results show that the tilting pad thrust bearing with incline angle θ=tan-10.01 maximize the thrust bearing’s load capacity.

並列關鍵字

scroll compressor ； thrust bearing ； Reynolds equation ； lubrication ； hydrodynamic

參考文獻

[3] Etsuo Morishita, Masahiro Sugihara, “Some design problems of scroll compressor”, Bulletin of JSME, Vol. 29, No. 258, December 1986

[8] Tatsuya Oku, Keiko Anami, Noriaki Ishii, Kiyoshi Sano, “Lubrication mechanism at thrust slide-bearing of scroll compressors(theoretical study)”, Proceeding of the 2004 International Compressor Engineering Conference At Purdue 2004, C104, pp.1-8

[1] Creux L., “Rotary engine,” U.S. Patent, No.801182, 1905

[2] Milton C. Shaw, Fred Macks, Analysis and lubrication of bearings, McGraw-hill book company, inc., New York, 1949, pp.299, table 8-1

[4] Sunil S. Kulkarni, “Scroll compressor: Thrust Bearing Design Under Laminar Conditions”, Proceeding of the 1990 International Compressor Engineering Conference At Purdue 1990, pp.327-332