共查询到19条相似文献,搜索用时 187 毫秒
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斜盘压缩机具有结构紧凑、噪声低以及高速稳定等特点,将其进行微型高压化并应用于天然气、红外冷却、潜水呼吸和气动弹射等高要求领域具有独特的优势。根据斜盘机构的结构和运动特性,结合多级压缩理论,确定微型高压斜盘压缩机的关键结构参数,在此基础上,建立起气缸内进气、压缩、排气以及膨胀4个过程的数学模型,对微型高压斜盘压缩机的各级气缸内的压力曲线进行数值模拟,绘制出气缸工作过程的指示图,研究不同转速对气缸压力变化的影响,进而分析其对等熵效率和容积效率的影响,为提高压缩机的整体效率提供理论依据。 相似文献
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研究了表面涂层-织构复合改性对GCr15材料零件高速运转条件下摩擦磨损性能的影响及其减摩机理。首先在GCr15表面热喷涂厚度约30μm的巴氏合金涂层,然后采用皮秒光纤激光器在涂层表面加工凹坑织构。采用球-盘摩擦磨损试验机对改性表面进行摩擦学测试,球试样和盘试样基体材料同为GCr15。研究发现,复合改性处理后GCr15盘试样表面微织构的毛刺硬度有所降低,与未经过复合改性处理的试件相比,复合改性表面的平均摩擦系数与体积磨损率明显降低;磨损检测结果显示复合改性表面试样产生的磨粒明显减少,磨损区域边界的塑性流动与磨粒磨损情况得到显著改善。GCr15材料表面经过复合改性处理后,织构加工质量和颗粒捕捉能力有了明显提高,从而使复合改性表面的摩擦学性能得到增强。 相似文献
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为了提高45钢的减摩和润滑性能,选择石墨和YG8硬质合金棒作为电极材料,利用电火花沉积在45钢基体表面制备底层硬质合金间隔分布的自润滑涂层,使用扫描电子显微镜、Image J软件以及EDS对涂层形貌、组成成分进行观察和研究,利用HSR-2M型摩擦磨损试验机进行摩擦磨损试验,分析了相同条件下自润滑涂层、基体和石墨涂层的摩擦磨损性能以及不同条件下自润滑涂层的摩擦磨损性能。厚度75μm、表面粗糙度1.679μm的自润滑涂层均匀、致密,摩擦系数和磨损量相较于基体和石墨涂层明显下降。在载荷为40N和往复摩擦频率为400t/min时,自润滑涂层的摩擦系数最小分别为0.213和0.225。研究结果表明,涂层的耐磨性和润滑性能受底层硬质合金、往复摩擦频率以及载荷的影响,原因是底层硬质合金层不仅能为顶层石墨涂层提供支撑,同时还能与石墨结合生成新的润滑膜,提高自润滑涂层的耐磨性和润滑性。 相似文献
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斜盘式压缩机,因活塞的往复运动是由一固结在主轴上的斜盘来驱动而得名。由于活塞往复运动是与驱动轴中心线平行,也将其称为轴向活塞压缩机。斜盘式压缩机没有曲柄连杆机构,在圆周方向上同时可配置若干个气缸,结构比较紧凑,平衡性能好,可取较高转速。由于受结构型式及强度的限制,排气量一般较小。对斜盘压缩机的主要几何关系、位移、速度、加速度及其牵连运动、相对运动进行分析,以建立斜盘式压缩机设计的基础;对其进行了受力分析;并专门对单列斜盘压缩机进行了受力分析;提出往复惯性力及其力矩的平衡所需采用的方法。 相似文献
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为探究涂层材料热特性参数对点接触弹流润滑的影响,选择3种不同方法制备的类金刚石(DLC)涂层和氧化锆陶瓷涂层,构建考虑涂层热特性的点接触弹流润滑模型,分析涂层材料、涂层厚度和润滑剂的流变性对接触区润滑性能的影响。结果表明:在弹流润滑状态下具有不同热特性的4种表面涂层导致了膜厚的差异,固体表面温度及润滑区温度场会随涂层热惯性变化;热惯性最小的DLC涂层加在快速运动表面能获得更高的膜厚;随着涂层厚度的增加,会引起固体表面的温度升高,使摩擦因数降低;非牛顿流体对压力、膜厚的影响很小,但与牛顿流体相比,能获得相对较低的温度。在弹流润滑状态下,涂层覆在快表面对于减小摩擦、提高膜厚是有益的。 相似文献
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To meet the demand of improved comfort for passengers, drive ability and standard in fuel economy; external variable displacement swash (wobble) plate type compressors are used in automobile air conditioning control system because of their low energy consumption and highly efficient characteristics. It controls the compressor displacement by increasing or reducing the swash plate angle. Solenoid operated electromagnetic control valve (ECV) in the compressor controls the air conditioning system by means of a pulse width modulation (PWM) input signal supplied from an external source (controller). The mechanism changes the swash plate angle by increasing or reducing the pressure of swash plate chamber using the ECV functions. The force (solenoid) for ECV operation is important as the force directly related to the movement of the internal feature i.e. mainly plunger of the ECV which is responsible for the amount of air/refrigerant flow that results the air conditioning control procedures with various pressure ports. The research paper highlights the improved theory and equation for calculating the working force (solenoid force) in ECV and experimental analysis of 3 (three) ECV samples followed by the comparison of theoretical and experimental force results. 相似文献
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简要描述了空调冷凝器风扇对空调压缩机电磁干扰产生的机理、干扰方式及造成的后果,针对此问题,提出了两种解决办法,对后续的现场维修、空调设计开发具有指导性意义. 相似文献
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针对空气压缩机重量重、气压低无法较好地搭载在机载武器中的问题,提出了一种新型的高压低重斜盘式压缩机.首先,优化传统单级活塞式结构以满足轻量化要求.其次,通过多级压缩的方式,将气缸分为若干级,相同级并联,相邻级串联,且每级气缸直径逐渐缩小,较单级压缩可提高15倍左右且持续可控.通过Matlab建立模型分析运动过程中压强、... 相似文献
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《机械工程学报(英文版)》2020,33(2):80-86
The interface between the slipper/swash plate is one of the most important frication pairs in axial piston pumps. The test of this interface in a real pump is very challenging. In this paper, a novel pump prototype is designed and a test rig is set up to study the dynamic lubricating performance of the slipper/swash-plate interface in axial piston machines. Such an experimental setup can simulate the operating condition of a real axial piston pump without changing the relative motion relationship of the interfaces. Considering the lubricant oil film thickness as the main measurement parameter, the attitude of the slipper under the conditions of different load pressure, rotation speed and charge pressure are studied experimentally. After the test, the wear state of the swash plate is observed. According to the friction trace on the surface of the swash plate, the prediction for the attitude of the slipper and the zone easy to wear are verified. 相似文献
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Due to favorable tribological performance, PTFE- and PEEK-based polymeric coatings have received interest in air-conditioning and refrigeration compressor applications, as a potential solution to supplement and potentially replace conventional oil lubricants. The literature in this area is somewhat scarce, especially on the tribological performance of PTFE- and PEEK-based polymeric coatings under aggressive conditions simulating compressor operation. In this work, several PTFE-, PEEK-, resin- and fluorocarbon-based polymeric coatings, coated on gray cast iron were tribologically evaluated using a specialized tribometer under compressor specific conditions, that included oscillatory motion (simulating piston-type compressors) and unidirectional motion (simulating swash plate compressor operation). The coatings showed good to excellent tribological performance, and in general PTFE-based coatings exhibited better friction and wear behavior than the rest of the coatings, including PEEK-based coatings. Long-term durability experiments also showed the superiority and suitability of PTFE/Pyrrolidone coating for potential use in oil-less compressors (where oil-less conditions refer to operation in the absence of any liquid lubricant). 相似文献
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为了适应电动汽车的发展要求,同时解决汽车现有空调驱动系统效率低的问题,研究了一种适合汽车电动空调使用的驱动系统。该系统采用无位置传感器无刷直流电机技术,并已成功应用于电动汽车、工程车辆等多个领域。在驱动器设计中,使用了一种基于反电动势过零点检测的无位置传感器控制技术,对于因启动负载过大或者负载突变引起的转子位置检测误差等问题,提出了一种附加过零点异常情况判断的过零位置修正方法。研究结果表明,该驱动系统能够很好地满足车用空调运行要求,同时过零点位置修正方法的加入对于提高电机和压缩机启动时的成功率和正常运行时的稳定性是非常有益的。 相似文献