소재변경에 따른 차량용 스크롤압축기의 열변형 해석

이형욱(Lee Hyoungwook),이근안(Lee Geunan),김정배(Kim Jeongbae) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.6

An inverter scroll compressor is used for the air conditioning in cars. Scrolls would be changed from the aluminum material to the magnesium material in order to satisfy the light weight trends of cars. The material changing influences on the scroll dimensions particularly the gap between two scrolls. Since the larger gap declines the performance of the compression, the gap between wraps of scrolls or the gap between wraps of scrolls to the plate of the opposite scroll is regarded as an important design variable. This paper is focused on the effects of the thermal stress due to the materials changing. The temperature difference between the inlet and the outlet is about 60 degrees and the highest operating temperature in the compressor is less than 110 degrees. The level of thermal stresses in the magnesium scroll is less than the result from aluminum one. The trend of the deformation is revealed that the normal directional deformation is 2 times lager than the in-plane directional deformation. Therefore the gap between the top of the wrap to the plate of the opposite scroll become more important than the other gaps. The orbiting scroll deforms larger than the fixed scroll by the thermal stresses. The deformation of the magnesium scroll is about 10% lager than that of the aluminum scroll. This value is similar to the ratio of the coefficients of thermal expansion of two materials. At the initial design stage, the results give many useful guides to engineers to propose gaps between parts.

스털링 엔진에 대한 스크롤 팽창기

김성준(Seongjun Kim),김현진(Hyun Jin Kim),김영민(Young-Min Kim) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.2

Conceptual design of scroll expander and scroll compressor for 10 ㎾-class Stirling engine utilizing solar energy as heat source has been carried out to estimate the applicability of scroll mechanism for Stirling cycle. CO2 was chosen as working fluid, since it has lower expansion index and higher density among probably usable gases. Gas temperature at the expander inlet was sel at 700℃, and that at the compressor inlet was at 40℃. System efficiency reached maximum at the pressure ratio of about 2.5. and the peak efficiency increased with increasing high side pressure. Due to safety concern, the pressure condition of 6 ㎫/2.5 ㎫ was chosen as design condition. Orbiting scroll members for the expander and compressor were designed to have double-sided structure in order to reduce the overall scroll size and to cancel out the axial gas forces acting on the orbiting scroll base plate- By parametric study on the scroll profile, smaller possible size for the scroll members was obtained. With the shaft speed of 3600 rpm, the shaft output of the designed scroll expander was calculated to be 45.4 ㎾, while input power for the scroll compressor was 34.5 ㎾, yielding 10.9 ㎾ for the output power of the Stirling engine. System efficiency was estimated to be about 7.3%, and overall efficiencies of the scroll expander and compressor were around 84.1% and 88.3%. respectively.

PWM 스크롤압축기를 적용한 시스템 에어컨의 냉방운전 시 압축기 토출온도에 대한 상관식 개발

권영철,박삼진,박병권,고국원,김대훈,윤백 한국에너지학회 2006 에너지공학 Vol.15 No.3

본 연구는 PWM 방식의 스크롤 압축기를 적용한 에어컨 시스템의 압축기 운전주기, 실내 온도, 그리고 실외온도를 변화시키면서 시스템 에어컨의 최적효율을 나타내는 압축기 토출온도 상관식을 도출하고자 실험연구를 수행하였다. 실험은 실내 및 실외 온도변화에 따른 시스템의 성능 및 압축기 토출온도를 측정하고자 다양한 온도를 설정하였다. 압축기 토출온도는 로딩듀티와 실외온도가 증가함에 따라 선형적으로 증가하였다. 로딩듀티(loading duty)와 실외온도 변화에 따른 압축기 토출온도는 실내온도 변화보다 실외온도의 변화에 더 크게 변화하였다. 압축기 토출온도 상관식은 실외온도, 실내온도, 그리고 로딩듀티의 함수로 표현되었으며, 실험으로부터 획득된 압축기 토출온도와 최대 3oC 이내에서 만족함을 확인하였다.

가변속 전동 스크롤 압축기의 스윙 부시 설계에 관한 연구

전성현,김영주,전병일,정도원,임정택,김현진 대한설비공학회 2022 설비공학 논문집 Vol.34 No.11

For a variable speed electric scroll compressor used for vehicle heat pump system, an eccentric bush combined with counterweight, so called swing bush, is widely used as a radial compliance device to control orbiting radius. Rotation radius of swing bush is a key design parameter in determining both sealing force magnitude exerted on the scroll wrap flank and restoring ability of the orbiting scroll back to its normal position after recess due to abnormal chamber pressure rise caused by the presence of refrigerant droplets, for instance. In this study, an analytical model for swing bush dynamics is presented and a way of optimum design is illustrated by a parametric study. 자동차 히트 펌프용 33 cc급 R134a 인버터 스크롤 압축기에서 선회스크롤의 반경방향 순응 기구로서 스윙부시를 적용할 때, 스윙부시의 기능성에 대해 설계 관점을 가지고 해석을 수행함에 있어서, (1) 스윙부시의 기능, 즉 순응성과 복원성 해석을 위한 해석적 모델을 제시하였다. (2) 크랭크 축 중심과 스윙부시의 자전 중심과의 거리로 정의되는 와 스윙부시의 자전 중심과 선회스크롤 기초원 중심과의 거리로 정의되는 자전 반경 의 사잇각 를 설계 인자로 하여, 의 변화에 따른 의 변화에 대한 크랭크 핀 하중과 스크롤 랩 측면 접촉력의 변화를 계산하였다. 가 증가하면 이들 하중은 감소하지만 랩 측면 접촉력이 음(-)이 되지 않도록, 의 크기 제한을 설계 시 고려해야 한다. 예를 들어 모든 운전속도에서 랩 접촉을 만들어내려면 로 설계해 주어야 한다. (3) 스윙부시의 복원성의 지표인 스윙부시의 관성 모멘트 계산을 수행하였다. 복원을 가능하게 해주는 의 설계 허용 범위가 압축기 운전속도가 높을수록 제한되는 것으로 나타났다. 예를 들면 현재 스크롤 압축기 모델에서는 운전속도 9000 rpm에서는 난방운전 시 모든 에 대해서 복원성을 얻을 수 없으며, 냉방운전에서는 의 범위에서만 복원성을 확보할 수 있다. 운전속도가 낮아질수록 이러한 제한은 완화된다. (4) 본 논문에서 제시한 스윙부시 해석 모델과 예시를 포함한 계산 방법은 스윙부시 최적 설계에 유용하게 활용될 수 있다.

마찰저감에 의한 친환경 스크롤 공기압축기(5HP)의 실용화 개발

김봉석,오익수 한국기계기술학회 2014 한국기계기술학회지 Vol.16 No.6

The adoption of scroll type air compressor is gradually increased in the automotive/residential air-conditioner and clean air compressor, and the most of critical components of the scroll are made of aluminum to reduce the friction and weight. Many studies for the surface treatment of the aluminum have been performed to reduce the friction between the components. In the preceding research, we suggested the most appropriate combination of the solid lubricant. In this study, we coated the part of fixed or orbiting scroll wrap with the solid lubricant that suggested in the preceding research, and then have performed analysis of performance characteristics for the part. As a result, we could obtain the 7.66μm of the coating thickness, Ra 0.8μm of the surface roughness and 0.088 of the friction coefficient. These represent the satisfactory capability of the suggested solid lubricant for the scroll type air compressor.

고압식 스크롤 압축기 스러스트 오일 그루브 최적 설계

김현진(Hyun-Jin Kim),노영재(Young-Jae No) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.3

Performance analysis has been carried out on a high side scroll compressor that had a fixed scroll equipped with a circular oil groove on its thrust surface. Oil was supplied to the oil groove through an intermittent opening from a high pressure oil reservoir formed inside the orbiting scroll hub. Oil in the groove was then delivered to both suction and back pressure chambers by pressure differentials and viscous pumping action of the orbiting scroll base plate. Mathematical modeling of this oil groove system was incorporated into a main compressor performance simulation program for an optimum oil groove design. The study findings were as follows. Pressure in the oil groove can be controlled by changing its configuration and the oil passage area. With an enlarged oil passage, the pressure in the oil groove heightens due to an increased flow rate, but the pressure elevation in the back pressure chamber is small, resulting in reduced friction loss at the thrust surface between the two scrolls. On the other hand, by increasing the oil passage area, the oil content in the refrigerant flow increases. Considering all these factors, the energy efficiency ratio could be improved by about 3.6% under the ARI condition by an optimal oil groove design.

CFD 해석 및 시험을 통한 스크롤 압축기의 토출 부 냉매유로 최적화 설계

김홍민(Hongmin Kim),박일영(Ilyoung Park),손일국(Ilguk Son),임권수(Kweonsoo Lim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11

The purpose of A/C system in the vehicle is to have a driver comfortable by adjusting temperature and humidity. To increase this A/C system efficiency, it is good way to increase compressor’s performance. But, if compressor"s performance is increased with noise, it will not be good design. The purpose of this study is, by optimizing Rear Head’s refrigerant path, to increase compressor’s performance and decrease noise value in the vehicle. In this paper, to satisfy compressor’s performance and noise we conducted CFD analysis, performance test, pulsation test, bulk noise test and real car noise test. Through these experiments, we could design optimization discharge system of scroll compressor.

스크롤 컴프레서 팁실의 마찰특성

정봉수(Bong Soo Jeong) 한국트라이볼로지학회 2014 한국윤활학회지(윤활학회지) Vol.30 No.6

The basic elements in a rotary-type scroll compressor are two identical spiral scrolls containing refrigerant gas. The pressure variations in the compression pockets of a scroll compressor change the forces acting on the orbiting scroll, and these forces affect the dynamic behavior of the compression mechanism parts. To achieve high efficiency, using a self-sealing mechanism as a tip seal mechanism is very effective. Tip seals, which are placed on top of the scroll wraps, accomplish thrust sealing. This study calculates the friction force between the tip seal and the side plate of a scroll compressor using the numerical model considered in the Reynolds equation. The calculated friction force is verified by an experiment using a pin-on-disk apparatus. A hydraulic servo valve that controls the pressure of the oil hydraulic cylinder applies the normal load for the test, and a DC servo motor controls the sliding velocity of the disk. The friction force and normal load are measured by the force sensors attached to the supporting parts. The results show that the theoretical and experimental results are similar and that the friction is influenced by the viscosity of the oil and the sliding velocity of the scroll.

전동 스크롤압축기의 운전rpm에 따른 냉동사이클의 성능에 대한 실험적 연구

이규선(Lee K. S.),이근안(Lee K. A.),이형욱(Lee H. Y.),이영선(Lee Y. S.),김정배(Kim Jeongbae) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.3

An experimental study was performed estimating COP(Coefficient of Performance) of air-conditioning cycle with inverter scroll compressor. All experiments were done for various compressor speeds from 1000∼4000 rpm and used the inverter controller called CANDy to change the compressor rpm. The air-conditioning cycle components in the apparatus were used as same with components of YF hybrid car. To estimate the COP, this study measured the temperature and pressure at inlets and outlets of compressor, condenser, and evaporator. And also measured the compressor input power using Powermeter. Through the experiments, the maximum error to estimate COP was shown about ±6.09% at 3500rpm. This study revealed that the condenser temperature and pressure were increased and the evaporator temperature and pressure were decreased with the increased compressor speed. And also, the COP was decreased with increased compressor speed. Those results can be used the basic and fundamental data to design the air-conditioning cycle with inverter scroll compressor.

상용차 하이브리드 냉방시스템 운전 모드 변화에 대한 성능 특성 연구

이호성(Hoseong Lee),원종필(Jongphil Won),조중원(Choongwon Cho),임택규(Taekkyu Lim),전한별(Hanbyoel Jeon),한만승(Manseung Han),김정일(Jungil Kim),김용찬(Yongchan Kim) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6

The objective of this study was to investigate performance characteristics of hybrid cooling system with scroll type electric compressor in a commercial vehicle. Tested hybrid cooling system had additionally the electric compressor besides present mechanical compressor to use selectively according to operating conditions. Applied electric compressor is scroll type and has 18.0 ㏄ displacement. In order to analyze performance characteristics of hybrid cooling system with respect to cooling capacity and COP(Coefficient of Performance), other components including two different types of compressors were installed and tested under various operating conditions such as compressor speed and air flow rate of the evaporator. When the electric compressor was operated with 4,500 rev/min, cooling capacity was about 4.0㎾ and COP was 3.5. To analyze hybrid system operating characteristics due to reasonable cooling capacity with electric compressor operation, mechanical compressor and electric compressor was operated by turns every 10 minutes under certain system operating conditions. Because surge pressure was found when two compressors was switched, operating strategy was required to have some time to balance the system pressure.