涡旋压缩机动静盘加工精度与泄漏量模型的理论研究

本文结合分形几何关于表面形貌的理论和等截面摩擦管内绝热流动的法诺流动模型,研究了通用型线涡旋压缩机泄漏量与啮合间隙的综合误差及粗糙表面分形维数的关系,为合理确定涡旋盘的加工精度,控制压缩机的泄漏量,提供了理论依据     

对称圆弧加直线修正型线涡旋压缩机脱啮角与排气角研究

在采用对称圆弧加直线修正型线涡旋压缩机设计计算中,形成中心压缩腔时的转角与压缩机排气时主轴的转角完全不同.针对这两种情形下的主轴转角,由于没有完整而清晰的阐述,导致计算涡旋压缩机各压缩腔容积时容易产生较大误差.对此,通过研究采用对称圆弧加直线修正涡旋压缩机涡盘始端型线的几何特性,定义了脱啮角与实际排气角,阐明了二者之间相互区别,详细推导了脱啮角计算公式并分析了影响脱啮角的因素,且根据涡盘始端壁厚增加造成修正后中心压缩腔容积减少的本质特点,提供了修正后涡盘始端壁厚增加容积和实际排气角的计算方法.通过运算实例验证了脱啮角与实际排气角相差很大的结论,指出实际排气角将影响排气孔的设计.     

涡旋压缩机排气管泄漏改善

本文以丹佛斯VLZ044变频涡旋压缩机为测试分析样本,研究了涡旋压缩机排气管泄漏问题,从设计余量,焊接质量,管路振动3个方面对涡旋压缩排气管泄漏进行了理论分析和试验测试,并通过改善焊接工艺参数和增加管路减震装置解决了该压缩机排气管泄漏问题,为涡旋压缩机管路泄漏的改善提供了参考方案。     

贝塞尔曲线在涡旋型线齿端加强中的应用

针对涡旋压缩机涡旋型线齿端部分壁厚较小,强度较低的问题提出了一种新的型线加强方法,替代了传统的圆渐开线与直线和多段圆弧相连的齿端形式,对齿端圆弧部分和圆渐开线啮合部分的平滑过渡条件C_0、C_1、C_2连续进行了分析,采用一条贝塞尔曲线连接圆渐开线与圆弧的新型齿端加强方法,此方法有效地改善了涡旋线齿端强度较低的问题,提高了涡旋压缩机的可靠性。     

涡旋压缩机技术研究进展与发展趋势

涡旋压缩机作为一种容积式压缩机,凭借其低振噪、高效率等优势,已成功应用于制冷、动力等各个领域。近年来,国内外学者对涡旋压缩机相关技术进行了深入研究,本文针对近十年涡旋压缩机技术研究进展,主要从涡旋压缩机的涡旋型线、泄漏及密封、平衡设计以及应用领域等方面对其进行阐述,对近十年国内外学者在这些方面取得的科研成果进行归纳和总结,指出了未来涡旋压缩机的发展趋势。     

无油涡旋压缩机涡旋齿齿顶密封结构的研究

本文对无油涡旋压缩机涡旋齿齿顶密封结构进行优化,提出一种新型径向组合密封结构,利用几何和工程流体力学的方法,推导出基圆渐开线无油涡旋压缩机齿顶光滑间隙密封、齿顶迷宫密封、齿顶组合密封泄漏量的算法,建立了无油涡旋压缩机相邻压缩腔实验台,分别测量了3种密封结构在相同压差条件下的气体泄漏量,并研究了无油涡旋压缩机动涡旋盘转速对泄漏量的影响。对比实验与理论计算结果可得：理论计算结果与实验结果基本相近,光滑密封与迷宫密封泄漏量随压差的增大而增大,而组合密封泄漏量与压差成反比,但密封条磨损量增加。迷宫密封泄漏量实测值约为光滑密封实测值的80%,组合密封泄漏量实测值约为光滑密封实测值的63%,且3种密封结构的径向泄漏量随动涡旋盘转速的提高而降低,当动涡旋盘转速超过4 000 m/s时趋于平稳。     

论涡旋式空气压缩机泄漏模型的建立

泄漏是造成涡旋压缩机功耗损失的重要因素之一,因此泄漏是影响涡旋压缩机效率的关键因素,而影响泄漏的因素又很多,除了泄漏通道面积以外,转速及润滑油的密封作用对泄漏量也有很大影响。为能完整、准确地模拟压缩机的工作过程,需建立相应的泄漏模型。求解泄漏模型是求解热力学模型的基础和前提。可将动、静涡盘间的泄漏分为两类,一类是通过型线轴向啮合间隙的径向泄漏,另一类是通过型线径向啮合间隙的切向泄漏。     

涡旋齿端型线的三角函数类修正研究

在深入研究涡旋压缩机型线包络啮合原理的基础上,提出了涡旋齿端型线的三角函数类修正几何理论,给出了齿端型线的通用修正方程并探讨了各种可能的修正形式.采用等距线法导出了任意封闭压缩腔容积的通用解析表达式和内容积比计算公式.系统地分析了各修正参数对涡旋齿端形状、压缩机内容积比和气体载荷特性的影响,精确地给出了它们之间的定量关系,总结了修正参数变化与容积效率、摩擦泄漏损失变化之间的规律,指出了三角函数类修正与圆弧类修正的转化条件.上述结论同样适用于其他涡旋型机械的型线修正.     

间隙泄漏对微型涡旋制冷压缩机流动及性能的影响

针对微型无油涡旋制冷压缩机的工作过程,建立了包含径向和轴向间隙的三维流动模型,通过CFD方法进行了数值模拟,分析了压缩机工作腔内部温度、压力的分布情况及流动特性,得到了冷凝温度、泄漏间隙对压缩机容积效率和等熵效率的影响规律。研究结果表明：固定轴向间隙为5μm,径向间隙从5μm变化到11μm时,容积效率从86.38%下降到75.11%,等熵效率从67.78%下降到56.18%。固定间隙均为7μm,冷凝温度由50℃变化到55℃的过程中,压缩机的容积效率从75.35%下降到73.49%,等熵效率由59.03%下降到56.79%。要使压缩机容积效率达到80%以上,应保证轴向间隙小于6μm,径向间隙小于9μm,为微型涡旋压缩机的设计提供参考。     

涡旋压缩机涡旋型线的研究现状及展望

涡旋压缩机作为第三代容积式压缩机,具有效率高、能耗低、噪声低、结构紧凑等诸多优点,被广泛应用于制冷空调与气体压缩等方面。由于涡旋压缩机的寿命、加工性能、效率和功耗等都受到涡旋型线的制约,所以涡旋型线的研究是开展涡旋压缩机其他研究的基础和关键。本文总结了国内外相关的研究成果,从型线类型和型线修正两个方面出发,对现有涡旋型线的研究现状进行综述分析,并对未来涡旋型线发展方向和趋势进行预测和展望,对于今后涡旋压缩机型线的研究与工程应用具有指导和借鉴作用。     

The effect of scroll wraps on the performance of scroll compressors

A number of geometrical curves have been used to form the wraps of scroll compressors. When the suction pressure, pressure ratio, scroll wrap height and thickness, and suction volume are constant, the effect of the involute curves of a cricle, square and line segment on the performances of the scroll compressor, such as geometrical parameters, leakage line length and various gas forces acting on the orbiting scroll are analysed in this paper. The effects of these scroll wraps on the performance of the scroll compressor vary as the suction volume changes. The results in this paper should be considered in scroll compressor design.     

Discussion on leaking characters in meso-scroll compressor

The leakage is unavoidable and has considerable influence on the performance of a scroll compressor. In a meso-scale scroll compressor, the working gas leakage is more serious because the gaps between the scroll plate pairs are more difficult to be sealed than the case in a normal scale scroll compressor. This paper analyzes the leakage and related factors with a simplified model, and discusses the performance that resulted from gas loss due to both leakages from tangential and axial directions in meso-scale compressors. The discussion and related results are helpful to determine some key parameters in the design and manufacture of meso-scroll compressors.     

Modeling of R-410A variable capacity compressor with Modelica and experimental validation

This paper presents an analysis of modeling methods for a short cycling, R-410A scroll compressor. Two parametric efficiency models of the short cycling scroll compressors are investigated, one with steady-state mean, and one with time varying efficiencies. Additionally, a dynamic model of a short cycling scroll compressor that incorporates scroll geometry, leakage, and a mathematical approximation of the digital capacity mechanism has been developed and verified against experimentally obtained data. Agreement with data for all methods was generally good, though in the dynamic model refrigerant mass flow was found to match observations when neglecting leakage. To validate the proposed models, a novel experimental testbed was developed by retrofitting a 15 ton nominal capacity rooftop heat pump with a short cycling scroll compressor. Unit operating conditions were varied in a parametric fashion using a large scale psychrometric chamber and the compressor transient performance was evaluated at full and part loads.     

汽车空调压缩机排量调节方法及主要变排量压缩机

本文介绍了几种主要的变排量调节方法,并分析了目前国内使用最为广泛的摇板式压缩机及迅速发展的单向斜盘式压缩机和涡旋式压缩机的性能特点及变排量原理.本文对近几年才发展起来的采用外部信号控制法或称即时冷量控制法的单向斜盘压缩机和涡旋压缩机也作了介绍.     

Scroll profiles in scroll compressors: General criteria and error sensitivity

General criteria for scroll profiles that include the evolute, orbiting movement, differential, and integrative conditions are proposed. The profile error sensitivity is defined based on the composite meshing error and meshing clearances of the scroll profiles. A case study on regular polygon involutes as scroll profiles indicates that the general criteria are satisfied when the edge number of the two involutes of a regular polygon is equal to the common multiple of the doubled number of scroll wraps on one scroll. The profile error sensitivity of the involutes of a base circle is shown to be controlled by the radial machining error, which is extremely low. The involute of a base circle is the ideal profile for a scroll compressor because it contains low error sensitivity and more stable dynamic characteristics.     

驱动轴承内嵌式涡旋压缩机特性分析

对驱动轴承内嵌于动涡旋齿中的涡旋式压缩机的几何特性进行了研究分析，引入了涡旋型线始端展角和终端展角，使吸气容积、吸气角、排气容积、排气角、内容积比等几何参数计算式的应用更为方便，它不仅适用于涡旋型线为整数圈的情况，而且也适用于涡旋型线为非整数圈的情况。将动涡旋的驱动轴承安置于涡旋齿中，可以在结构设计上达到减少气体力和动涡旋离心惯性力对动涡旋产生的倾覆力矩的目的，从而改善了驱动轴承的受力状况。延长了使用寿命。     

On the profile design of a scroll compressor

The scroll configuration plays a very important role in the design of a scroll compressor. Therefore, in the present paper, a general design process for the profile of a scroll compressor is proposed. The design process is developed based on geometric as well as kinematic considerations. It is general enough that not only a perfect meshing profile (PMP) but other profiles can be designed and constructed. The latter includes meshes with clearance and meshes with interference. A correction angle is introduced such that the discharge angle of the compressor can be varied from a negative value to a positive value, which in turn results in different shapes of scroll profile. The geometric boundary conditions for all profiles are maintained continuous up to the first order. Easier manufacture and better performance of scroll compressors may be predicted based on this condition. Computer simulations are provided to show that applicability and versatility of the proposed design process.     

含运动副间隙的涡旋压缩机动平衡仿真研究

为了研究运动副间隙对涡旋压缩机动平衡的影响,根据涡旋压缩机机构运动副间隙特点,采用非线性等效弹簧阻尼模型和Coulomb摩擦模型建立考虑摩擦作用的运动副间隙接触碰撞模型,并将其嵌入到ADAMS动力学仿真软件中,建立了含运动副间隙的涡旋压缩机动力学模型,针对小轴防自转机构、间隙大小和间隙数目三种情况,进行了动力学仿真。仿真结果表明：小轴防自转机构、间隙大小和间隙数目对涡旋压缩机的动平衡有显著影响,为合理选用轴承游隙提供了参考,并为提高涡旋压缩机的动力特性提供了理论依据。