Pressure Pulsation Phenomena in Reciprocating Compressor System equipped by a Snubber

Wanda Ali Akbar,KyeongHwan Lee,KyuJin Shim,HanShik Chung,HyoMin Jeong 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-

Pulsation is an inherent phenomenon in reciprocating compressors. It interacts with piping to cause vibrations and performance problems. Indiscriminately connecting to a compressor can be dangerous and cost money in the form of broken equipment and piping, poor performance, inaccurate metering, unwanted vibration, and sometimes noise. Piping connected to a compressor can materially affect the performance and response. To minimize these detrimental effects, reciprocating compressor system should be equipped by pulsation suppression system. The system usually comprises bottle volume, called snubber, and choke tube. This study discusses pressure pulsation phenomena occurred in a reciprocating compressor system. An experiment applied air compressor unit, as pulsating pressure generator, has been done. The compressor was connected sequentially to a snubber model and pressure tank. Sensor probes were placed on the inlet and outlet pipes of snubber. Compressor was driven by a motor controlled by a frequency regulator. The experiment was conducted by adjusting the regulator at 30, 40 and 50 ㎐. In order to determine the outlet pressure load, the pressure tank was set at 0, 100 and 150 ㎪. The experimental result shows effect of varying compressor speed and pressure load on pressure amplitude reduction and mean pressure loss. These two parameters indicate performance of the model on suppressing the pulsation.

왕복동식 미소 유량 공기압축기의 설계 및 성능예측 이론연구

박형수,김철호 한국기계기술학회 2019 한국기계기술학회지 Vol.21 No.2

In this theoretical study, a design and performance analysis theory of a micro flowrate and high pressure air-compressor is developed. The governing equations are from the gas state equation and fluid dynamic theories because the working fluid in the air compressor is in a gas phase. A case study was conducted to design a reciprocating type of air compressor which the target performance was 0.6liter/min in the volume flowrate with 5atg in air pressure at 1,600rpm rotational speed. Geometrical size of the model air compressor designed is 10mm in stroke, 20mm in bore with 4.79 compression ratio. From the performance analysis of the model compressor, it was found that the air volume flowrate produced was 0.6liter/min with 5.81atg in pressure. The design theory of a micro-size high-pressure air compressor developed in this study is expected to be very useful design tools in NANO technology industry.

왕복동식 공기압축기의 소음 발생원 분석 연구

이광길,최승주 한국안전학회 2011 한국안전학회지 Vol.26 No.4

This paper is to investigate noise source for reciprocating type air compressors. The reciprocating type air compressors are widely used in the small and medium sized enterprise and many employees are affected and irritated by their noise during working. The investigation and analysis of the noise source were made according to the ISO 1680/1 and MIL-STD 7410-1 and noise evaluation of each part of compressors was made. Noise emitted from the intake and exhaust valve and the air receiver tank were dominant compared with those from other parts of compressor. Noise from the motor and the revolution of crank mechanism was negligible relatively with the noise sources as mentioned above.

Development for Numerical Thermodynamic Modeling of a Reciprocating Air Compressor in Vehicle Air Suspension System

Hao Liu,Jaecheon Lee 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11

The research aim of the paper is to develop the numerical thermodynamic model for a reciprocating air compressor of the vehicle air suspension system. According to the reciprocating air compressor structure, volume variation inside the cylinder, intake air temperature, four different periods in each air compression cycle and heat transfer of the heat sink are analyzed in modeling. The numerical model of compression process as well as temperature variation of the air compressor heat sink is constructed in the condition that the air compressor continuously charges air into a tank. By using the thermodynamic model presented, the numerical simulation results indicate that the developed model can correctly describe the working process of the reciprocating air compressor.

Multi-stage diagnostic system for reciprocating compressor using DTW technique

H. C. Kim,조미경,심재술 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.8

The reciprocating compressor has widely been used in the industry because of low cost to mass production and high efficiency of performance. If an abnormal compressor is produced, high service cost occurs due to the increased service claim rate (SCR). A great deal of research has been conducted for real-time diagnosis of the compressor while it is being made in the manufacturing line. However, since the compressor structure is quite complicated, it is still difficult to find the cause of the compressor fault. Even with outstanding diagnostic tools, it is hard to screen an abnormal compressor at one time. We have developed a multi-stage diagnosis scheme to monitor the abnormal compressor. In this diagnosis scheme, the dynamic time warping (DTW) technique is employed to diagnose the fault compressor. The LAN based network is applied for connecting from first diagnosis PC to second diagnosis PC. The multi-stage diagnosis manufacturing line is established and the DTW technique has been successfully implemented in the diagnostic system. The multi-stage DTW system screens most of the abnormal compressor. The gage R&R is conducted to secure the reliability of the system.

An Overview of Parameters Influencing the Performance of Hermetic Reciprocating Compressor for Domestic Applications

K. John Samuel,R. Thundil Karuppa Raj,G. Edison 대한설비공학회 2018 International Journal Of Air-Conditioning and Refr Vol.26 No.4

The performance of the refrigeration system mainly depends on the hermetic compressor. Of different compressors used in the refrigeration and air conditioning industries, hermetic reciprocating compressors are still efficient and have its place in domestic applications. This paper presents a review of most critical parameters and their influence on the hermetic reciprocating compressor performance. A detailed study is done on parameters like backflow, effective force and flow areas, valve dynamic behavior, etc. This study mainly concentrated on compressor valves which influence the performance of the hermetic compressor to a much greater extent. Finally, the study reveals that these parameters are playing a vital role in influencing the performance of the refrigeration system. Advanced numerical techniques involving combining fluid flow and structural analysis involving Fluid Structure Interaction (FSI) may give a better insight of the flow physics happening inside the compressors and the effect of fluid force on valve fluttering, back pressure and dynamics characteristics can be revealed in depth to optimize the performance of the hermetic compressor for household applications involving air conditioners, refrigerators, water coolers, chillers, etc.

Noise source identification of the hermetic reciprocating compressor for refrigerator

손영부,Jihun Choi,Soogab Lee 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.11

Noise source identification of the hermetic reciprocating compressor for refrigerator has been investigated. Since the compressor shell housing is designed as airtight chamber to suppress refrigerant gas coming into contact with outside atmosphere, behaviors of the compression driving part are difficult to observe. So far, noise generation mechanism of the hermetic reciprocating compressor is studied by empirical estimation or intuitive consideration. Therefore, novel approach is required to figure out the relationship between compression process and noise generation. In this paper, behavioral features of primary components such as valve system and cylinder pressure are investigated by using the custom-designed compressor. Noise characteristics are clarified by measurement of another mass-produced compressor, separately. In order to identify the relation between compression procedure and noise generation simultaneously, synchronization of measured time signals is carried out. Short time Fourier transform (STFT) analysis is performed to verify noise generation mechanism with respect to both time and frequency domains. In addition, correlation between operating speed and noise characteristics is considered as the reciprocating compressor drives at various speed according to operating conditions of the refrigerator.

V/W형 왕복동 공기압축기의 평형에 관한 연구

김형진,김성춘,김정만,김의간 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.1

Recently, as the marine compressor power is increased, vibration problems on the marine vessel with V/W type reciprocating compressor have been occurred. A research on the balancing of marine V/W type reciprocating compressor has hardly been reported though a number of researches on the balancing of rotating machinery have been conducted. As a V/W type compressor has high capacity with long stroke, compact size and high center of gravity, It is easy to have a vibration problem by a little bit unbalanced force and moment. In this study, calculation methods for balance weight of the V/W type reciprocating compressors, which have different piston weight and asymmetry structure, are formulated. And their reliability were verified by comparing calculated balance weight with the experimental results of the real marine V/W type reciprocating compressors.

왕복동식 수소압축기의 흡입밸브 통로유동에 관한 수치해석

이경환(Gyeong-Hwan Lee),라흐만(M-Sq-Rahman),심규진(Kyu-Jin Shim),정효민(Hyo-Min Jeong),정한식(Han-Shik Chung) 한국마린엔지니어링학회 2008 한국마린엔지니어링학회 학술대회 논문집 Vol.2008 No.-

A complex passage analysis on suction valve has been performed with a high pressure reciprocating hydrogen compressor. General information about an internal gas flow is presented by numerical simulation approach. Flow characteristic analysis, including pressure and turbulence kinetic energy distribution of hydrogen gas coming to the cylinder of a reciprocating compressor are presented in this paper Suction passage model is designed based on real model of hydrogen compressor. Pressure boundary conditions are applied considering the real condition of operating system. The result shows static pressure and turbulent kinetic energy are not distributed uniformly along the passage of the Hydrogen system. Path line or particles tracks help to demonstrate flow characteristics inside the passage. Based on this result, the design improvement, such as reducing the varying flow parameters and flow reorientation should be done. Consequently, it will be achieved much better hydrogen compressing system.

The friction characteristics of the journal bearing in a reciprocating compressor for refrigeration and air conditioning systems

조인성,정재연 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.4

The performance of a reciprocating compressor in refrigeration and air-conditioning systems is influenced by the lubrication characteristicsof the critical sliding components. Thus, the lubrication characteristics between the crankshaft and journal bearing have to be researchedin order to improve the design and performance of a reciprocating compressor. Therefore, in this study, to enhance the EER(energy efficiency ratio) to reduce power consumption, and to improve the reliability of a reciprocating compressor for refrigeration andair conditioning systems, theoretical analysis of the friction characteristics between the crankshaft and journal bearing in a reciprocatingcompressor is studied. The results demonstrate that frictional characteristics are significantly influenced by the clearance between thecrankshaft and journal bearing and the viscosity of the lubricating oil.