共查询到19条相似文献,搜索用时 140 毫秒
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压缩机内润滑油分布对压缩机性能有一定影响,但由于滚动转子式压缩机的全封闭性,对观察其内的润滑油的流动状况就造成了一定的困难,因此本文利用CFD商业软件STAR-CD,采用拉格朗日法模拟滚动转子式压缩机内润滑油的分布情况。同时还计算出了高转速下旋转式变频压缩机的油循环率(OCR)的大小,压缩机的电机各个部分的油滴数量、逃逸油滴数量及质量百分比等随曲轴角度的变化情况。计算结果表明冷媒及润滑油通过定子通孔和转子气隙流到电机上部,上升不是直线上升,而是随转子转动呈螺旋式上升。在高转速下,压缩机油循环率(OCR)较高且处于波动状态。 相似文献
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随着制冷系统的不断发展,双螺杆制冷压缩机作为系统的核心部件,其运行压力也越来越高,使得滑动轴承的应用也越来越广泛,以承受不断增大的转子径向力,而转子轴心轨迹是滑动轴承工作状态的综合反映。本文通过搭建双螺杆制冷压缩机转子轴心轨迹测试系统,对不同工况以及内容积比下的轴心轨迹进行了试验研究。研究结果表明:与滚动转子压缩机、离心压缩机等旋转机械不同,双螺杆压缩机的转子轴心轨迹大致呈椭圆形,且每个运行周期中还存在若干波动,这些波动的数目对应于压缩机的阴转子齿数,即转子径向动载荷的波动频率。 相似文献
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滑片式空气压缩机压力和功率的分析与试验 总被引:2,自引:0,他引:2
对滑片式空气压缩机工作时的压力状态和功率组成进行分析研究,并通过与应用压力温度传感器和电流表的检测方法得到的试验数据进行比较来验证研究结果。在理论分析中,压力平衡状态被分成6个主要部分,功率组成分成4个主要部分,对每部分的压力和功率过程进行分析,建立理论计算模型,分别求解得到各个部分的参数:为验证理论分析的有效性,对两种不同类型压缩机在正常工作条件下的内部工作状态进行测试;将计算结果与试验数据进行比较后的结果表明,两者有较好的一致性,因此研究结果可用来预测滑片式压缩机的工作状态。 相似文献
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Hee Moon Chae Chang Nyung Kim 《International Journal of Precision Engineering and Manufacturing》2010,11(4):589-596
Rotary compressors in air-conditioners have been considered for the efficiency enhancement and noise reduction. To perceive
the characteristics of noise in a rotary compressor, the features of discharge valve motion and pressure fluctuation in compressors
have to be examined. This study has been conducted to investigate the characteristics of discharge valve motion and pressure
fluctuation in association with refrigerant flow in rotary compressors with single and dual muffler. The current study has
been performed with the FSI mode since the discharge valve oscillates in association with periodic compression of refrigerants
in the compressors. For the case of dual muffler, it has been observed that the displacement of discharge valve is smaller
than that in the case of single muffler since the compressor with dual muffler has larger inner resistance to the refrigerant
flow than that in the case of single muffler. Also, the standard deviation and the energy spectrum of the pressure fluctuation
with the dual muffler are smaller than those with the single muffler. Therefore, the use of the dual muffler is expected to
contribute to the noise reduction. To the contrary, it has been found that the efficiency of the compressor with dual muffler
is smaller with the diminution of volume flow rate compared to the case of single muffler. This study may supply a basis for
the design of rotary compressors with higher efficiency and lower noise. 相似文献
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This paper presents a novel diagnostic technique for monitoring the system conditions and detecting failure modes and precursors
based on wavelet-packet analysis of external noise/ vibration measurements. The capability is based on extracting relevant
features of noise/ vibration data that best discriminate systems with different noise/vibration signatures by analyzing external
measurements of noise/vibration in the time-frequency domain. By virtue of their localized nature both in time and frequency,
the identified features help to reveal faults at the level of components in a mechanical system in addition to the existence
of certain faults. A prima-facie case is made via application of the proposed approach to fault detection in scroll and rotary
compressors, although the methods and algorithms are very general in nature. The proposed technique has successfully identified
the existence of specific faults in the scroll and rotary compressors. In addition, its capability of tracking the severity
of specific faults in the rotary compressors indicates that the technique has a potential to be used as a prognostic tool. 相似文献
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The rolling piston type rotary compressor has been widely used for refrigeration and air-conditioning systems due to its compactness
and high-speed operation. The present analysis is part of a research program directed toward maximizing the advantages of
refrigerant compressors. The study of lubrication characteristics in the critical sliding component is essential for the design
of refrigerant compressors. Therefore, theoretical investigation of the lubrication characteristics of a rotary compressor
being used for refrigeration and air-conditioning systems was investigated. The Newton-Raphson method was used for a partial
elastohydrodynamic lubrication analysis between the vane and the rolling piston of a rotary compressor. The results demonstrated
that the vane thickness and the center line position of the vane significantly influenced the friction force and the energy
loss between the vane and the rolling piston. 相似文献
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Ihn-Sung Cho Seok-Hyung Oh Jae-Youn Jung 《Journal of Mechanical Science and Technology》2001,15(5):562-568
The rolling piston type-rotary compressor has been widely used for refrigeration and air-conditioning systems due to its compactness
and high-speed operation. The present analysis is part of a research program directed toward maximizing the advantages of
refrigerant compressors. The study of lubrication characteristics in critical sliding components is essential for the design
of refrigerant compressors. Therefore, theoretical investigation of the lubrication characteristics of a rotary compressor
used for refrigeration and air-conditioning systems was studied. The Newton-Raphson method was used for the partial elastohydrodynamic
lubrication analysis between the vane and the rolling piston of a rotary compressor. The results showed that the rotational
speed of a shaft and the discharge pressure significantly influence the friction force and the energy loss between the vane
and the rolling piston. 相似文献
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J. W. Miller 《Lubrication Science》1989,6(2):107-122
This paper reviews the optimum synthetic and semi-synthetic lubricants for various types of compressors and gases being compressed. Several applications are given involving centrifugal, rotary, and reciprocating compressors. Gases include air, refrigerant, natural and other hydrocarbons, chemical processing and industrial. Included also are food grade air compressor applications. In addition, microlube systems for once-through cylinder lubrication of large reciprocating compressors designed to minimize gas contamination are also described. 相似文献