• Title/Summary/Keyword: Oil supply

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Design of Oil Supply Enhancement Device for a Variable Speed Reciprocating Compressor (가변속 왕복동 압축기의 급유 촉진기구 설계)

  • 김현진;이태진
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.15 no.1
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    • pp.25-31
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    • 2003
  • This paper addresses an oil supply enhancement device to resolve a shortage of oil supply or no oil supply at all encountered at low speed operation for a variable speed reciprocating compressor used for household refrigerators. The oil supply enhancement device comprises a moving cylinder attached to the lower end of crankshaft and two of fluid diodes, each one at the inlet and outlet of the cylinder. Up-and-down movement of the cylinder against the lower end of the crankshaft together with the functioning of the two fluid diodes produces net oil flow from oil reservoir to inside the crankshaft. The experiment on the test bench has shown that enough oil supply into the oil feeding hole cu be made by using this device even at low speed range. Some analytical study has also been carried out to under-stand its oil supply mechanism.

Study on the damage of Bearings due to failure of Oil Supply System at turbine (터빈 베어링 윤활유 공급 중단에 의한 베어링 손상에 대한 고찰)

  • Koo, Jae-Raeyang;Lee, Woo-Kwang;Koo, Woo-Sik;Kim, Yeon-Hwan;Park, Kwang-Ha
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.1258-1261
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    • 2003
  • Oil supply system is one of the most important part of Turbine. Lubricating oil of bearings supplied by oil pump. Failure of Oil supply pump critical damaged parts of Turbine, especially bearings. In this paper we have discussed the serious damage of turbine bearings due to failure of Oil supply pump.

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Analysis of Oil Supply Characteristics for Reciprocating Compressor (왕복동 압축기 오일 급유 특성 분석)

  • Lee, Byeong-Yeong;Ko, Han-Seo;Ryu, Ki-O;Youn, Young;Park, Seong-Woo
    • 유체기계공업학회:학술대회논문집
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    • 2006.08a
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    • pp.545-546
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    • 2006
  • A problem of oil supply for a reciprocating compressor is very significant for an evaluation of reliability. Since a rotational motion of a crank shaft for the reciprocating compressor with small capacity is used for a power source of oil supply, a centrifugal force of the rotational shaft provides a stroke of oil inside the shaft like a centrifugal pump. The pumped oil rises following an inner wall and provided to a bearing passed through an oil supply hole at the side of the shaft for lubrication of the bearing. In this study, the amount of oil supply has been investigated by a numerical analysis for various conditions such as a shape of a groove, rpm of the compressor, and a shape of a flow channel. Also, a method of increasing oil supply for a low rpm has been studied so that the function can be improved for a variable condition.

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The Effect of Engine Tilting Conditions on the Oil Supply System (엔진 경사 조건이 오일 공급 시스템에 미치는 영향)

  • 전문수;김숭기;박병완
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.3
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    • pp.37-43
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    • 2004
  • Engine lubrication system is generally affected by vehicle driving conditions; acceleration, braking deceleration, and cornering. The oil supply system such as oil pan, baffle plate, and oil pick-up pipe should be optimized to cope with severe driving conditions. The main purpose of this paper is to understand the effect of the engine tilting angle on the oil supply system using engine tilting test rig. For the purpose, the oil pressure fluctuation and oil aeration in the main gallery are measured at various engine tilting angles. In addition, the oil flow is visualized by using transparent oil pan to investigate the cause of the formation of oil aeration. The test results show there is a strong correlation between the main gallery oil pressure fluctuation and oil aeration. It is also found that the visualization technique is helpful to stabilize the oil supply system at severe driving conditions.

A Study on the Engine Lubrication System Analysis Adapting Discontinuous Oil Supply Crankshaft System (불연속 오일공급 크랭크샤프트 시스템을 채택한 엔진 윤활시스템의 해석)

  • 윤정의
    • Tribology and Lubricants
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    • v.20 no.1
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    • pp.27-32
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    • 2004
  • This paper presents unsteady oil flow behaviors in the engine lubrication network to clarify the differences between continuous and discontinuous oil supply crankshaft system. Using commercial network analysis program, Flowmaster2, engine lubrication network system analysis were carried out. And effects of crankshaft speed and supplied oil pressure on pressure fluctuation in oil groove and oil flow rate to each bearing were analyzed.

The Effect of Oil-Starvation on the Lubrication Characteristics of High-Speed Bearing: Part II-Roller Bearing (가스터어빈용 고속 베어링의 Oil-Starvation 윤활특성: Part II-Roller Bearing)

  • Kim, Ki-Tae
    • Tribology and Lubricants
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    • v.13 no.1
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    • pp.76-81
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    • 1997
  • The lubrication characteristics of high-speed roller bearings at oil-starvation have been investigated empirically using the bearings employed in small industrial gas turbine engines. Testing was done by simulating the oil-starvation conditions in engines, such as stopping the oil-supply to the bearing during normal operating, starting without oil-supply at atmospheric temperature, and accelerating with oil-supply at atmospheric temperature. During testing, the temperature of bearing, the power consumption, and the rotating resistance of the bearing were measured. From this study, on the contrary to the ball bearing, it was found that the resistance of the bearing was higher at the regime of without oil-supply than that at the regime of with oil-supply, despite less power consumption.

Numerical Simulation of Oil Supply System of Reciprocating Compressor for Household Refrigerators (냉장고용 왕복동 압축기 급유 시스템의 수치해석)

  • Kim, H.J.;Lee, J.K.
    • Journal of Power System Engineering
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    • v.9 no.4
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    • pp.24-30
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    • 2005
  • For a reciprocating compressor of household refrigerators, a direct analogy between the pipe flow network and the electric circuit network has been utilized to set up a mathematical model for oil supply system. Individual lubrication elements of the oil supply system, such as propeller- installed oil cap, oil galleries, radial oil feeding holes, spiral oil grooves, and various sliding surfaces have been analogized by equivalent electric elements, and these have been combined together to form an electric circuit corresponding to the whole oil supply system. By solving the closed network equations of the model, oil flow rates at various lubrication elements could be obtained. Total amount of the oil flow rate drawn into the shaft has been measured and compared reasonably well with the prediction of the numerical simulation.

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An Investment Model for OPEC Crude Oil Supply with Real Option Game (실물옵션 게임을 이용한 OPEC의 원유공급 투자모형)

  • Park, Hojeong
    • Environmental and Resource Economics Review
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    • v.14 no.3
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    • pp.753-773
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    • 2005
  • This paper is a study of the investment dynamics focusing on crude oil supply by OPEC and non-OPEC. Oil supply capacity is first determined by a leader, OPEC, and by an aggregate that represents non-OPEC producers. OPEC wants to increase a gain from oil price increase while keeping its market share relative to non-OPEC's share. An investment rule model is developed for OPEC crude oil supply capacity in response to non-OPEC's decision. In presence of oil price uncertainty, oil price threshold is derived above which it is optimal for OPEC to expand oil supply capacity since otherwise the increased supply of non-OPEC results in weakening of OPEC market share in the world oil market. In addition, a lower threshold price is derived below which OPEC triggers a capacity reduction to regain its otherwise forgone profits. A simulation is provided for calculating the capacity expansion and reduction thresholds.

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Analysis of Oil Supply System of a R134a Rotary Vane Compressor (R134a 로타리 베인 압축기 급유 계통 해석)

  • Kim, Ho-Young;Kim, Hyun-Jin
    • Proceedings of the SAREK Conference
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    • 2008.11a
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    • pp.113-118
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    • 2008
  • For a R134a rotary vane compressor used for car air conditioners, characteristics of gas compression and oil supply have been studied. The compressor model under investigation has the low volume ratio of suction to discharge volumes so that there occur flow reversal from discharge port to compression chamber as the leading vane passes over the discharge port. As a result, the volumetric and adiabatic efficiencies turn out to be relatively low compared to other types of displacement compressors. Oil supply mechanism has been comprehended for mathematical modeling and oil flow rate has been calculated for the individual oil passages. This study on the gas compression and oil supply of a rotary vane compressor can be applied to a future design practice on a similar type of compressor.

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Effect of Oil Supply Direction on Power Loss and Bearing Temperature of Elliptical Bearing (오일공급 방향에 따른 타원형 베어링 손실 및 온도 특성)

  • Bang, Kyungbo;Choi, Yonghoon;Cho, Yongju
    • Tribology and Lubricants
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    • v.34 no.4
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    • pp.138-145
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    • 2018
  • Elliptical bearings are widely used for large steam turbines owing to their excellent load carrying capacity and good dynamic stability. Power loss in bearings is an extremely important parameter, especially for high turbine capacities. Optimization of operation conditions and design variables such as bearing clearance and bearing length can reduce the power loss in elliptical bearings. Although changes in the oil supply method have served to increase the efficiency of the tilting pad journal bearing, it has not explicitly improved elliptical bearings. In this study, we verify the static characteristics of an elliptical bearing by changing the direction of oil supply. We evaluate the bearing power loss and bearing metal temperature, and compare the bearing performance and reliability in different test cases. The direction of oil supply is $90^{\circ}$ (9 o'clock) and $270^{\circ}$ (3 o'clock) when the rotor rotates in a counterclockwise direction. We use an elliptical bearing with an inner diameter and active length of 220.30 and 110.00 mm, respectively. Bearing power loss and bearing metal temperatures are measured and evaluated by rotor rotational speed, oil flow rate, and bearing load. The results reveal a 20 reduction in the power loss when the direction of oil supply is 90. Furthermore, the oil film on the upper part of the bearing has a high temperature when the direction of oil supply is $90^{\circ}$. In contrast, when the direction of oil supply is $270^{\circ}$, the oil film on the upper part of the bearing is relatively cold.