氮气压缩机气阀阀座断裂原因分析及改进

为了满足当下工作的需要,进行氮气压缩机气阀阀座断裂原因的分析是必要的,这涉及到座断原因及其改造模块的分析,从而进行氮气压缩机网状气阀阀座问题的解决,保证其气阀的工作环境的优化,保证其材质模块、阀座模块等的开展。这需要应用到氮气压缩机的各个部件工作模块,进行其阀座及其相关部件的强度分析,从而满足当下工作的需要,积极做好相关的验算工作,保证阀座高度的提升,使其满足我国相关法律法规的需要,实现危险截面的整体安全性。本文介绍了氮气压缩机网状气阀阀座出现断裂的现象,分别从气阀的工作环境、材质和阀座强度3个方面进行了分析,在确定阀座Ⅱ—Ⅱ危险截面弯曲应力不足导致阀座断裂后,增加了阀座高度并重新进行验算,使结果符合Ⅱ-Ⅱ危险截面安全的要求。     

空调压缩机铸铁上轴承阀座漏气原因分析及工艺改进

上轴承是空调用压缩机泵组件的核心零件之一。阀座漏气是上轴承加工过程中一种常见的质量问题。本文阐述了沈阳华润三洋压缩机有限公司在引进15F系列直流变频产品时,其生产线加工的新品铸铁上轴承阀座漏气率一直居高不下,针对这一不良现象,工艺技术人员进行原因分析及工艺改进。     

往复式压缩机气阀可靠性分析

以往复式压缩机气阀工作原理为基础,结合压缩机的实际运行情况,对压缩机气阀的可靠性进行研究分析,并对气阀故障现象进行讨论,提出了提高气阀可靠性的途径。     

往复式活塞压缩机连杆有限元分析

利用Solidworks 2004软件建立了往复式活塞压缩机连杆的实体模型,然后导入ANSYS软件进行了静力分析,得到了其应力分布云图,满足强度的要求。介绍连杆力学模型和有限元分析在连杆设计中的应用情况,阐述利用有限元分析得到的连杆应力和应变的计算结果,以及对连杆设计的指导意义。     

关于125系列压缩机气阀破碎的分析

Analysesofgasvalves'fragmentationonSeries-125’refrigerationCompressors一、事故的发生1993年12月26日早晨六点四十五分左右，我市某冷库一台4AV－125型氨工缩机正在为低温库降温制冷时，突然发生沉闷的任击声，随即听到连续类似爆竹的响声。操作人员紧急停车，压缩饥停止     

浅谈压缩机的原理及维护

往复活塞式压缩机是容积式压缩机的一种,是利用活塞在气缸中对流体进行挤压,使流体压力提高并排出的压缩机械。随着医药、纺织、食品、化工等工业部门对产品质量要求冷型全无油压缩机相比,具有结构简单、便于移动和操作、不需要水源、适应性更强等特点,因而越来越得到广泛的关注、研究和应用。热力、动力计算是压缩机设计计算中基本压缩机的受力情况。准确地分析机组受力情况,对于消除机组的振动非常重要。活塞式压缩机热力计算、动力计算的结果将为各部件图形以及基础设计提供原始数据,其计算结果提供的成分、气量、压力等参数要求,经过计算得到压缩机的相关参数,如级数、列数、气缸尺寸、轴功率等。     

调节阀阀座传统结构的改进

通过对调节阀阀座传统螺纹结构在实际生产和应用中存在的一些问题的分析,提出了一种新型的改进方案,即新型无螺纹结构,该结构具有传统结构诸多无法比拟的优越性,发展前景广阔,有推广价值。     

直流调速滚动转子式压缩机气阀结构优化设计

针对客户提出的2 hp直流调速滚动转子式压缩机性能优化要求,对气阀结构设计进行分析。通过模拟及试验验证,找到降低排气部分损耗的主要措施:增加阀片厚度和降低阀片升程,实现产品性能优化,且可靠性提高,满足用户需求。     

单螺杆式制冷压缩机的滑阀结构改进

分析单螺杆式制冷压缩机常用滑阀结构的优缺点,指出目前滑阀结构在能量调节和内容积比调节方面存在的问题,提出一种通过实测压缩终了压力来调节内容积比的滑阀结构,该滑阀结构可以有效减小内外压比不等带来的不利影响。     

Microstructural analysis of the brass seat of a valve from the 1907 steam tug “Hercules”

The steam tug Hercules was an ocean-going and bay tug for 55 years before being retired. It is now being restored by the National Park Service (as of 1993 printing of this article). A broken steam valve was obtained for microstructural examination. The body was gray cast iron, and the stem and seat were brass. The examination centered on corrosion of the brass components. The seat and shaft were α brass, with a hardness of 64 and 79 DPH, respectively. A nut held the shaft onto the seat and was α-β brass with a hardness of 197 DPH. Welded on the end of the shaft was a ring of hard (DPH 294) α-β brass, which seated against the nut. The brass seat and stem showed little corrosion. However, the α-β brass nut and welded tip show extensive dezincification. This process of removal of Zn and the retention of Cu began in the high Zn β phase, but eventually both phases were attacked. The depth of penetration was consistent with dezincification rates reported in the literature for such brasses in salt water if the valve had been in service about 55 years. Reprinted from Microstructural Science, vol. 20, Metallographic Characterization of Metals after Welding, Processing and Service, Proc. of the Twenty Fifth Annual Tech. Meeting of the International Metallographic Society, W.R. Kanne Jr., G.W.E. Johnson, J.D. Braun, and M.R. Louthan, Jr., ed., The International Metallographic Society, Columbus, Ohio, and ASM International, 1993, pp. 471–484.     

可溶球座密封环密封性能分析与结构优化

可溶球座压裂后无需钻除作业,可自行溶解而实现井眼全通径,已成为致密油气水平井分段体积压裂的关键工具。可溶球座密封环的密封性能决定着水平井压裂作业的成败,因此开展了密封环密封性能的仿真分析及其结构优化研究。分析了可溶球座密封环的工作原理,运用有限元仿真方法分析了其密封性能。结果表明,坐封完成后密封环所受最大应力达到182.26 MPa,存在局部破坏的风险。进行了密封环材料和结构的优化设计,分析了各结构参数对密封性能的影响。优化后可溶球座能在50 kN坐封力的作用下安全坐封,密封环与套管内壁和滑动体的最大接触应力均大于压裂液压力,且接触应力分布较为均匀,满足密封要求。密封环结构优化后,可溶球座的密封和安全性能得到了提高。研究结果可为可溶球座密封环结构的改进提供参考。     

Influence of valve dynamics on compressor performance

The valves of piston compressors can cause volumetric losses if they do not function properly and these losses originate from the condition where the force of valve springs differs from the optimal force which can be calculated from equations (1), (2) and (3).This problem is particularly critical with suction valves and the purpose of this report is to determine the factors which influence these losses.These determinations were realised via a series of computer simulations giving various operating conditions. The results show that the gas force A* (equation (1)) and the Mach number Ma* (equation (5)) determine the level of losses for a given force difference. Fig. 4 shows the kind of volumetric losses that can be expected. The most critical conditions occurred with a low A* value and high Mach number, hence careful attention should be given to dynamic design for such conditions.This study has revealed that unnecessary losses can be avoided if spring forces are maintained at about 50 to 150% of the optimal force of springs.     

Dynamic fracture research based on XFEM and its application on discharge valve guard of hydrogen compressor

The structural safety analysis under complex environment and load conditions is at the leading edge of engineering researches. The dynamic fracture research based on Extended Finite Element Method (XFEM) is probed into in the paper, and the modeling principle of strong discontinuities based on XFEM is applied to dynamic fracture mechanics to overcome the difficulty of defining meshes around crack tip without remeshing. XFEM-based dynamic interaction integral method is developed to reduce the calculation error caused by the non-matching meshes in the crack-tip area. Typical examples, the edge crack plate and central inclined crack plate under Heaviside function type impact loads, are taken to validate effectiveness of the method. Furthermore, as an engineering application, a valve guard subjected to impact load is simulated using the method, and numerical simulation results suggest that the valve guard is relatively safe under static load without hydrogen environment, but the real operating conditions with both hydrogen environment and dynamic load, will lead to higher brittle fracture risk for the valve guard.     

冰箱压缩机吸气簧片阀的数值模拟与优化

给出吸气簧片阀在受到冲击载荷下的动态响应运动特性以及吸气簧片阀有限元形式的数学模型--平板振动系统力学模型.对吸气簧片阀的两维平面薄板振动数学模型采用相对应的有限元法,求解阀片动力学方程和流动方程联立形式的阀片运动规律方程组,用冲击载荷下吸气簧片阀数学模型进行了数学模拟和强度分析,实现对簧片阀动态响应的快速和准确模拟,优化了阀片形状,改善了阀片可靠性.     

Mechanical fatigue and spectrum analysis of small-satellite structure

Mechanical fatigue due to environmental loads and spectrum analysis due to launch loads of the primary structure of a low cost, low-earth orbit small satellite intended for earth observation missions are presented. The payload of the satellite under consideration is a precise optical unit to image the earth’s surface having a mass of 45 kg. 3-D Finite Element Model for the satellite structure is generated by applying substructure method. Modal analysis is required to determine natural frequencies of the satellite and define its mode shape. Then, ranking of mode shapes according to specific constraint is performed. Harmonic analysis at resonance frequencies with the highest ranking is done and cumulative fatigue damage analysis is performed. Spectrum analysis is performed for Small Sat structure to verify the satellite structure reliability under all dynamic random vibration loads applied during transportation and launch cases.     

Linear compressor discharge valve behavior using a rigid body valve model and a FSI valve model

The discharge valve of a linear compressor commonly uses a circular plate valve and research on such valves is lacking. Thus, in this study, the rigid body model and the FSI model, widely used for the reed valve, were used to examine the behavior of the discharge valve. Also, a comparison with experimental results was conducted to determine the characteristics of each valve model. According to the results, only the valve lift of the FSI model was in agreement with the experimental result. Moreover, the 3D rigid body valve model could not predict the additional displacement fluctuations of the valve that cause backflow during the expansion process of the compressor whereas the 3D FSI valve model was able to predict the additional displacement fluctuations. Therefore, the FSI model was found to be advantageous in calculating the cooling capacity or EER of the linear compressor with the circular plate discharge valve.     

制冷压缩机阀片断裂失效分析

对半封闭活塞式制冷压缩机的断裂阀片的分析表明,阀片失效属于金属疲劳断裂机制。阀片表面缺陷可以形成疲劳裂纹源,而阀片在加工或者使用过程中形成的机械损伤或者腐蚀凹痕是表面缺陷的表现形式。对7C27 Mo2和20C两种阀片钢进行比较分析可知,7C27 Mo2比20C具有更高的抗拉强度、硬度、疲劳强度和耐腐蚀性,在压缩机高负荷使用条件下应优先选用7C27 Mo2。