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结合某宇航产品试验用自复叠制冷系统项目案例,针对此系统因回温问题导致机组发生故障进行分析,并对原系统回油管路进行优化设计,通过具体实验测试,通过观察油回路视镜及回油量,结果表明优化后的回油管路设计合理,性能可靠,整个系统能实现顺利回油,延长了压缩机运行寿命,同时,使整个系统的试验可靠及稳定性得到极大的提升。 相似文献
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本文介绍了冷冻油的选择依据,分析了冷冻油在压缩机中的作用以及影响制冷系统回油的诸多因素,指出了缺油及润滑不良对制冷系统造成的危害。 相似文献
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模块化多联机中同时存在多压缩机并联与多室外机并联的情况,因此压缩机、室外机间的回油、均油是影响模块机可靠性的一个关键问题。通过对系统循环的详细分析,综合各回油、均油技术的研究,特别是二级油分离技术及自适应回油均油技术,从根本上有效地解决模块机间的回油及均油问题,对于多联机的研究具有重要的意义。 相似文献
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针对多联机系统制热模式下冷冻油滞留于系统中的情况进行研究,主要对空调系统的气态连接管、液态连接管、室外机换热器和室内机换热器进行理论分析和试验验证。研究结果表明:多联机制热模式下,压缩机冷冻油主要滞留于气态连接管和无开机需求的室内机。 相似文献
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《制冷与空调(北京)》2015,(12)
介绍一种全新的船用制冷剂泵供液制冷系统回油方法,并将其与传统的回油方法进行比较,据此设计一种全新回油控制装置。重点介绍该装置的设计方法及设计要点、采用该回油方法的特点及其对整个制冷系统的影响。试验结果表明,该回油控制装置可实现连续地将低压侧液态制冷剂中溶解的润滑油返回至压缩机吸气口并进入油分离器,且能够有效地控制并将低压侧液态制冷剂中溶解的润滑油量稳定维持在制冷系统可接受的范围内。试验结果与理论计算结果基本吻合。 相似文献
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夏雨亮 《制冷与空调(北京)》2013,(5):15-18
对满液式螺杆式冷水机组的回油方式进行介绍,尤其针对引射回油展开详细分析,具体讨论机组增加引射回油的必要性及其增加引射回油对系统的影响,并且简要分析不同引射回油系统的优缺点;然后对满液式螺杆式冷水机组跑油情况进行分析论述,并针对每种情况给出相应的解决方案。 相似文献
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Forschung im Ingenieurwesen - In order to study the influence of oil discharging hole on the oil charging and discharging characteristics of wet clutch, a mathematical model of oil... 相似文献
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Pratik Nayak 《International Journal of Pavement Engineering》2017,18(7):595-607
Recycling of highway materials is an effort to preserve the natural environment, reduce waste and provide a cost-effective way for construction of highways. The reclaimed asphalt pavement (RAP) contains stiffened binder caused by loss of volatile materials and oxidation. Hence, the addition of high amount of the RAP to asphalt mix may make it prone to fatigue failure. Due to this reason, addition of RAP to asphalt mixture in substantial amount has been a challenge so far. Therefore, ‘rejuvenators’ which are supposed to restore chemical and physical properties of the aged asphalts are used effectively in asphalt mixture. In this study, two locally available oils, i.e. pongamia oil (locally known as Karanja oil) derived from the seeds of Pongamia pinnata and a composite rejuvenator made of castor oil and coke oven gas condensate have been explored for rejuvenating the aged binder. The rheological properties of aged binder and rejuvenated binders were studied using a dynamic shear rheometer. From the various rheological tests conducted, it was found that certain proportion of pongamia oil as well as composite castor oil was able to impart desirable rutting as well as fatigue performance for the rejuvenated binder samples. The thermal analysis carried out using thermogravimetric analysis ensured adequate thermal stability for the binder specimens treated with these oils. In terms of binder performances, it was found that these oils could be considered as suitable rejuvenators for effectively restoring properties of the aged binder. Performance studies on RAP mixes may be extended for recommending these two oils as rejuvenators for hot mix pavement recycling. 相似文献
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Developing bactericidal coatings using simple green chemical methods could be a promising route to potential environmentally friendly applications. Here, we describe an environmentally friendly chemistry approach to synthesize metal-nanoparticle (MNP)-embedded paint, in a single step, from common household paint. The naturally occurring oxidative drying process in oils, involving free-radical exchange, was used as the fundamental mechanism for reducing metal salts and dispersing MNPs in the oil media, without the use of any external reducing or stabilizing agents. These well-dispersed MNP-in-oil dispersions can be used directly, akin to commercially available paints, on nearly all kinds of surface such as wood, glass, steel and different polymers. The surfaces coated with silver-nanoparticle paint showed excellent antimicrobial properties by killing both Gram-positive human pathogens (Staphylococcus aureus) and Gram-negative bacteria (Escherichia coli). The process we have developed here is quite general and can be applied in the synthesis of a variety of MNP-in-oil systems. 相似文献
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An analytic expression for the optimal distribution of oil products in oil tanks that minimizes the measurement error of the
total mass of the oil products in the tanks is determined. A simple algorithm for implementing the optimal distribution which
is easy to use in selecting an optimal variant is developed.
Translated from Izmeritel’naya Tekhnika, No. 1, pp. 27–30, January, 1998. 相似文献
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油脂食品的塑料包装研究 总被引:2,自引:0,他引:2
本文分析了油脂食品的特性、影响其品质变化的因素及包装要求.研究了油脂食品塑料包装及提高塑料包装贷架寿命的方法,并通过实验进行了验证研究. 相似文献
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Present work deals with the experimental investigation of tribological properties of GF-filled polymer composites considering
three velocities, i.e. 0.5, 1 and 2.0 m/s and loads ranging from 15.7 N to 45.13 N keeping rest of the parameters constant.
The test has been carried out for three materials, PTFE + 15% GF, PTFE + 25% GF and PTFE + 35% GF in wet (oil) and adding
additive as graphite (5% wt) in oil. SAE 20W40 oil is used for the test. Friction and wear tests of PTFE composite against
a counter surface of EN8 with surface finish of 0.56 μm are carried out at ambient conditions using pin-on-disc tribometre
(TR-20), Ducom make, Bangalore. The results are tabulated and graphs are plotted. It has been found that load and wet conditions
have significant effect on coefficient of friction and specific wear rate of the materials. Where as sliding velocity also
plays little role in wear mechanism of the material. It is concluded from the experimental study that the specific wear rate
in wet condition as well as by adding additives in lubricating oil with 5% (by wt.) has been declined. Also the specific wear
rate decreases with normal load and sliding velocity. Wear of PTFE + GF composite decreases with increase in glass percentage.
Microscopic analysis of pin and disc surface is made with optical microscope. The mathematical models has been developed by
using regression analysis and found to be valid for the above tested parameters. 相似文献
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G. Krishna Bama K. Ramachandran 《Journal of Engineering Physics and Thermophysics》2010,83(1):213-219
Using the photoacoustic technique, the thermal diffusivity of a dimethoxymethane + jatropha liquid mixture and pure jatropha
oil is measured at room temperature. The result is correlated with the result of ultrasonic measurements. 相似文献