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함영복(Y. B. Ham),차재곤(J. G. Cha),김대명(D. M. Kim),공태우(T. W. Kong),윤소남(S. N. Yun),안국영(K. Y. Ahn),권병수(B. S. Kweon) 유공압건설기계학회 2010 드라이브·컨트롤 Vol.7 No.1
This paper presents the experimental results of the radial piston type oil pump with new mechanism for a metal diaphragm hydrogen compressor. Generally, metal diaphragm type hydrogen compressor systems are operated by oil hydraulic power. In this system an oil compensating pump has been demanded to compensate for a leakage oil head chamber. The metal diaphragm type hydrogen compressor consists of an oil compensating pump, commonly used hydraulic piston pump and driven by main crank shaft. The radial piston type oil compensating pump with new rolling contacted piston mechanism is developed and experimented. The developed piston element of the radial piston pump consists of piston, steel ball, return spring, two check valves, eccentric cam and ball racer. In this study, designed 4 type pistons as and orifice hole. Operating characteristics and pressure ripple characteristics are tested under no load to 60bar loaded with every 20bar increasing step and pressure ripple and flow rate are experimentally investigated.
함영복(Y. B. Ham),최준혁(J. H. Choi),윤동원(D. W. Yun),윤소남(S. N. Yun),서종수(J. S. Suh) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This paper presents a sealing mechanism of the gerotor motor in order to develop a low speed and high torque gerotor motor. A gerotor motor is suitable for weight transfer system, such as winch system, weight conveyer system, wheel and angular drivers and mixers etc. To develop a low speed and high torque gerotor motor, the rotor profile was investigated using the space volumetric method. Also, the gap between the rotor and stator was evaluated in order to confirm the design method of rotor profile.
함영복(Y. B. Ham),박인섭(I. S. Park),박중호(J. H. Park),윤소남(S. N. Youn),신경철(K. C. Shin),이기태(G. T. Lee) 유공압건설기계학회 2013 유공압건설기계학회 학술대회논문집 Vol.2013 No.10
This study proposes a new mechanism for needle-free drug injection into the skin of agricultural animals that can be simple, lightweight and high response characteristic, for the delivery of proteins or vaccines. Jet injectors, which deliver drugs into the skin using compressed springs or compressed gas, provide a needle-free method of conventional transdermal drug delivery. However, the compressed spring or gas type injector has the drawbacks of high weightand impact noise. On the other hand, the high pressure injection device using a high pressure pump and an on-off valve has the advantage that it is smaller than the noise of spring or gas injectors. For this reason, we propose a mechanism that consists of a high pressure pump, an accumulator, an on-off valve and an injection nozzle. We tested a commercial injector- a compressed gas injector - and the impact gun type injector - a compressed spring injector - and used them to verify new specifications. The accuracy of injection was measured with an electronic weight balancer. Finally, the proposed mechanism was evaluated their suitability for needle-free drug injection based on results of the analysis and comparison of all the injectors.
함영복(Y. B. Ham),구지석(J. S. Gu),김대명(D. M. Kim),김성동(S. D. Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The radial piston pump has lots of advantage as followings; high operating pressure, compactness, high mechanical efficiency and so on. However this pump also has disadvantage that plunger type piston induce large friction due to sliding. In this study, the ball type piston pump was designed to decrease the friction loss on the plunger type piston pump. To confirm the decreasing of friction loss in the designed pump, The pressure and flow rate characteristics ware measured while the operation condition was changed. After that, the power efficiency of the pump was worked out at experimental data. From this result, the performance of small radial ball piston pump was confirmed.