A Study on High Efficiency Wing-Vane Compressor - Part.2: Lubrication Characteristic of The Partial Arc Guide Bearing -

Low global warming refrigerants such as HFO (hydro fluoro olefin) -1234yf are attracted as an alternative working fluid in air-conditioning and cooling systems to address global warming. However, it used to require larger compressor size due to the lower fluid density compared with conventional refrigerants such as R410A. Thus, a new wing-vane compressor which has no contraction between the vane and the cylinder is developed to prevent increase in the size without performance degradation. Â Rotary motion of the vane is supported by the partial arc guide on the upper and lower ends of the vane. Revealing the lubricating properties of the guide was one of the development issues. Â So we have analyzed the guide bearing performance such as friction coefficient and oil film thickness with fluid dynamics lubrication model of the guide bearing. And we measured the friction coefficient of the guide bearing by experiment. The analysis model was validated by comparing the simulated friction coefficient and that of experiment. In addition, we examined the effect of the shape of the guide bearing on the lubricating properties. The results are as follows: (1)When the load is applied to the center of the guide arc angle, the friction coefficient of the analysis and experiment result is in good agreement. (2)The friction coefficient of the guide bearing can be organized in Stribeck diagram as well as full journal bearing in the fluid lubrication region

A Study on High Efficiency Wing-vane Compressor - Part.3: Experimental Evaluation of the Prototype -

Low global warming refrigerants such as HFO (hydro fluoro olefin) -1234yf are attracted as an alternative working fluid in air-conditioning and cooling systems to address global warming. However, it used to require larger compressor size due to the lower fluid density compared with conventional refrigerants such as R410A. Thus, a new wing-vane compressor which has no contraction between the vane and the cylinder is developed to prevent increase in the size without performance degradation. The structure of the wing-vane compressor is different from the conventional vane compressor. Therefore, a prototype of the wing-vane compressor was operated using R134a refrigerant to simulate HFO-1234yf refrigerant. The results are as follows: (1) The steady operation is observed in the general operating condition. (2) The steady mechanism of vane is clarified by both experiment and simulation. (3) A simple lubrication structure is achieved by supplying the oil to the friction surface through the grooves with the partial arc guide bearings

A Study on High Efficiency Wing-vane Compressor - Part.1: A Simulation Analysis of Dynamic Model -

Low global warming refrigerants such as HFO (hydro fluoro olefin) -1234yf are attracted as an alternative working fluid in air-conditioning and cooling systems to address global warming. However, it used to require larger compressor size due to the lower fluid density compared with conventional refrigerants such as R410A. Thus, a new wing-vane compressor which has no contraction between the vane and the cylinder is developed to prevent increase in the size without performance degradation. The wing-vane compressor has higher compression efficiency compared to the conventional vane compressor as it has no friction loss of the tip of the vane and it can significantly reduce the mechanical loss for the conventional vane compressor. Since the structure of the wing-vane compressor is different from the conventional vane compressor, the load characteristic on the rotor and vanes are completely different from the conventional vane compressor. Therefore, the compression characteristics and the load characteristics are investigated by creating a dynamic model of the wing-vane compressor and a prototype of the wing vane compressor was operated using R134a refrigerant.. The results are as follows: (1) Characteristics of torque and load are equivalent to those of a conventional vane compressor. (2) Lubrication of the newly added partial arc guide bearings is important to ensure the reliability