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함덕용(D. Y. Ham),윤소남(S. N. Yun),백강년(K. N. Baek),이현철(H. C. Lee),신행봉(H. B. Shin) 유공압건설기계학회 2013 유공압건설기계학회 학술대회논문집 Vol.2013 No.10
This paper presents feasibility of a pressure reducing valve for emergency breathing system. The reducing valve consists of a valve body, a diaphragm, a diaphragm pin, springs, and a relief valve with a poppet for emergency gas discharge. The diaphragm and diaphragm pin are important equipment for the cracking pressure adjustment and control flow rate and leakage flow. In this paper, the reducing valve was designed to three-dimensional shape, and FEM based static structure analysis for pressure endurance limit was conducted. The analysis of the structure was achieved by using Ansys static structure software module. Finally, It was confirmed that the designed valve is useful to the emergency breathing system.
윤소남 (Y. S. Nam),함덕용 (D. Y. Ham),한유리 (Y. Han),이근우 (K. W. Lee),정병홍 (B. H. Jeong) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
This study presents the possibility of the refrigerant control using electronic expansion valve which is operated by stepping motor. The electronic expansion valve is a type of flow control equipment that is a combination of a poppet, a positioner, three reduction gears and a stepping motor. The poppet modulates orifice its opening to maintain the controlled refrigerant flow. So, pitch control of the positioner and pulse control of the three reduction gears are very important design parameters for performance improvement of this study object valve. In this paper, the effects of the nonlinearity, the hysteresis on the performance and flow rate characteristics of electronic expansion valve were investigated. The input pulse of stepping motor, displacement characteristics and flow rate characteristics of this valve were analyzed through the experimental setup.
윤소남(S. N. Yun),함덕용(D. Y. Ham),한유리(Y. Han),정병홍(B. H. Jeong) 유공압건설기계학회 2008 유공압건설기계학회 학술대회논문집 Vol.2008 No.10
An air conditioner(air conditioning system) is a cooling equipment that has a the process of the one-cooling cycle such as compression, condensation, expansion and evaporation. Expansion process is operated by expansion valve that is a kind of mass flow control component. The characteristics of a expansion valve design parameters such as linearity, repeatability and hysteresis are very important because these parameters affect the variation of the COP(Coefficient of Performance). This paper presents the static and dynamic characteristics of a bellows type expansion valve. The static and dynamic analysis by experiments and the structure analysis by FEM tool were accomplished for development of the new structure of expansion valve. The torque characteristics of the stepping motor and the displacement variation of the poppet valve were also analyzed through the experimental setup. In this study, the new structure of the expansion valve through the theoretical analysis and experiment was suggested. And it was confirmed that the suggested model is proper to apply in the air conditioning system.