Investigation of dynamic characteristics and power consumption of the swing compressor with no valves. (November 2022)

• Record Type: Journal Article
• Authors: Pan, Xi; Pan, Shulin; Zeng, Wang; Liu, Hanwen; Xie, Junlong
• Is Part Of: Case studies in thermal engineering. Volume 39(2022)
• Publication Date: 2022-11
• Subjects: Swing compressor -- No valves -- Frictional loss -- Indicated power -- Shaft power -- Mechanical efficiency; Heat engineering -- Case studies -- Periodicals; 621.40205
• DOI: 10.1016/j.csite.2022.102413
• Languages: English
• ISSNs: 2214-157X

Abstract

Abstract: The investigation of dynamic characteristics is very important and the excellent dynamic characteristics mean the low friction losses and a high mechanical efficiency. This paper presents a mathematical model to analyze the dynamic characteristics of swing compressor with no valves. The movement and mechanical characteristics of three main components have been analyzed in detail. A method based on the gas force has been applied to calculate the indicated power, which is compared with the indicated power calculated through the integrated area of P-V diagram. The calculation errors between these two methods are within 2%. Additionally, the frictional loss, shaft power and mechanical efficiency have been calculated at different discharge pressures and different shaft speeds. An experiment has been carried out and the required shaft power has been measured to verify the theoretical results. The errors between calculation results and experimental results of shaft power are within 4%, which proves that this dynamic mathematical model is accurate. Besides, the simulation results show that four important factors affecting the total frictional loss are the frictional loss in eccentric bearing, the frictional loss between swing rod and bushes, the frictional loss between rotor and cylinder and the frictional loss in thrust bearing. Highlights: A relatively complete method has been presented to study the dynamic characteristics of swing compressor with no valves. A novel method based on gas forces has been presented to calculate the indicated power. The errors between calculation results and experimental results are within 4% at different operation speeds and within 2% at different discharge pressures.