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미끄럼 조건에 따른 로터리 압축기 베인/롤러 표면의 마찰 마멸 특성
오세두(Se-Doo Oh),조성욱(Sung-Oug Cho),이영제(Young-Ze Lee) 한국트라이볼로지학회 2004 한국윤활학회지(윤활학회지) Vol.20 No.6
One of the serious challenges in developing rotary compressor with HFC refrigerant is the prediction of scuffing times and wear amounts between vane and roller surfaces. In this study, the tribological characteristics of sliding surfaces using vane-roller geometry of rotary compressor were investigated. The sliding tests were carried out under various sliding speeds, normal loads and surface roughness. During the test, friction force, wear depth, time to failure and surface temperature were monitored. Because severe wear occurred on vane surface, TiN coating was applied on sliding surfaces to prolong the wear life of vane-roller interfaces. From the sliding test it was found that there was the optimum initial surface roughness to break in and to prolong the wear life of sliding surfaces. Depending on the load and speed, the protective layers, which were composed of metallic oxide and organic compound, were formed on sliding surfaces. Those would play an important role in the amounts of friction and wear between roller and vane surfaces.
CO<sub>2</sub> 트윈 로타리 압축기의 흡입관로에서의 가스맥동 해석
김우영,안종민,김현진,조성욱,Kim, Woo-Young,Ahn, Jong-Min,Kim, Hyun-Jin,Cho, Sung-Oug 대한설비공학회 2011 설비공학 논문집 Vol.23 No.8
For a $CO_2$ one-stage twin rotary compressor, a T-shaped suction port was used to effectively supply the suction gas stream into two individual suction chambers of the twin cylinders. Suction gas pulsations were observed in the pressure sensor signals and these were simulated by using the acoustic modeling of Helmholz resonators in parallel. The module of acoustic modeling was combined to a computer simulation program for the compressor performance. Validation of the simulation program has been carried out for a bench model compressor in a compressor calorimeter. Cooling capacity and the compressor input power were reasonably well compared between the simulation and the calorimeter test. Particularly, good agreement on P-V diagram between the simulation and the test was obtained.
CO₂ 냉매와 윤활유 환경하에서 코팅된 베인의 마찰 및 마멸특성에 관한 실험적 연구
오세두(Se-Doo Oh),정성훈(Sung-Hoon Jeong),안태식(Tae-Shik Ahn),박정민(Jung-Min Park),조성욱(Sung-Oug Cho),이영제(Young-Ze Lee) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.6
The CO₂ was investigated as an alternative refrigerant to replace HFC (hydrofluorocarbons) refrigerant in air conditioning systems due to the environmental concerns. Because new compressors with CO₂ are going to be operated under the high pressure, the tribology of sliding surfaces in the compressor becomes very important. To develop new compressor, especially rotary type, the friction and wear characteristics of sliding surfaces between a vane and a roller in the rotary compressor were evaluated in this paper. Several hard coatings, such as TiN, CrN and WC/C, were applied on vane surfaces in order to improve the tribological characteristics, and their performances were evaluated experimentally. Two types of lubricants were used, namely POE (polyol ester) oil and PAG (polyalkylene glycol) oil. The vane-on-disk type sliding tests were performed with an exclusive high pressure wear tester. From the tests, wear volumes of vane surfaces applied various coatings were compared. Test results showed that WC/C and CrN coatings showed good tribological properties. Also, the results of the sliding tests showed that using PAG oil has an advantage over POE oil in CO₂ environment.
CO₂ 트윈 로타리 압축기의 흡입관로에서의 가스맥동 해석
김우영(Woo Young Kim),안종민(Jong Min Ahn),김현진(Hyun Jin Kim),조성욱(Sung oug Cho) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.8
For a CO₂ one-stage twin rotary compressor, a T-shaped suction port was used to effectively supply the suction gas stream into two individual suction chambers of the twin cylinders. Suction gas pulsations were observed in the pressure sensor signals and these were simulated by using the acoustic modeling of Helmholz resonators in parallel. The module of acoustic modeling was combined to a computer simulation program for the compressor performance. Validation of the simulation program has been carried out for a bench model compressor in a compressor calorimeter. Cooling capacity and the compressor input power were reasonably well compared between the simulation and the calorimeter test. Particularly, good agreement on P-V diagram between the simulation and the test was obtained.
로터리 압축기 구동부 재료인 GCD-550 과 GC-250 의 마찰 마멸 특성에 미치는 냉매의 영향
이규선(Gyu-Sun Lee),전홍규(Hong-Gyu Jeon),조성욱(Sung-Oug Cho),이영제(Young-Ze Lee) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.11
In order to adapt the environment-friendly refrigerants to compressors, it is necessary to know the tribological characteristics in case of using those refrigerants. This paper is a study on evaluating the tribological characteristics of compressor with an alternative carbon dioxide refrigerant. To know the effects of carbon dioxide, sliding wear tests were carried out with non-refrigerant, carbon dioxide refrigerant and R410a refrigerant that is being used now. The specimens are GCD-550 and GC-250 those are made of the real material as used a shaft and flange of rotary compressor. Consequently, wear scar width of carbon dioxide is the largest among three conditions. The surface roughness was measured after tests. In case of carbon dioxide, cracks propagated more deeply in the depth direction in comparison with other cases.
T-형상 흡입 관로를 갖는 CO2 트윈 로타리 압축기에서 흡입 압력 맥동
김우영(Woo Young Kim),안종민(Jong Min Ahn),김현진(Hyun Jin Kim),조성욱(Sung oug Cho) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
For a CO2 one-stage twin rotary compressor, a T-shaped suction port was used to effectively supply the suction gas stream into two individual suction chambers of the twin cylinders. Suction gas pulsations were observed in the pressure sensor signals and these were simulated by using the acoustic modeling of Helmholz resonators in parallel. The module of acoustic modeling was combined to a computer simulation program for the compressor performance. Validation of the simulation program has been carried out for a bench model compressor in a compressor calorimeter. Cooling capacity and the compressor input power were reasonably well compared between the simulation and the calorimeter test. Particularly, good agreement on P-V diagram between the simulation and the test was obtained.