旋叶式压缩机设计理论研究
发布时间：2018-09-01 18:53
【摘要】：本论文项目为机械传动国家重点实验室开放基金资助(项目编号：SKLMT-KFKT-200905)。 目前，旋叶式压缩机已成为全球汽车空调压缩机的主流。对于压缩机气缸型线设计，原有的适用于滑片对心布置的旋叶式压缩机的气缸型线设计理论缺乏通用性，本研究突破传统的设计理念，将气缸型线的设计直接归结为滑片运动规律模型的建立，对旋叶式压缩机的密封性和工作腔容积进行分析，在保证滑片运动动力特性曲线光滑、连续的前提下，生成一条使得旋叶式压缩机性能更优的多项式滑片运动规律曲线，根据滑片运动与气缸型线的数学关系，得到满足滑片运动规律的气缸型线。对于压缩机的背压腔模型设计，运用反求的思想，将背压腔几何形状的设计归结为背压数学模型的建立，，背压数学模型主要是控制滑片顶部与气缸内壁的接触力，从而降低摩擦功率损耗和改善滑片受力状态，提高压缩机的性能。论文研究工作主要包括以下研究内容： 分析了滑片偏心式旋叶式压缩机的优势，运用等距曲线的包络原理，将滑片的运动简化为滑片顶部主圆弧圆心的运动，对滑片偏心式旋叶式压缩机建立起滑片运动学模型，导出了滑片位移、滑片速度及滑片加速度与转子转角的关系，并由获得的理论进行了仿真分析，该方法避免了求解滑片接触点的复杂过程，同时具有求解的精确性，对广泛应用的偏心式旋叶式压缩机滑片的运动提出了科学符实的理论计算方法。利用MATLAB对其进行数值仿真分析，证明其结果的准确性。由分析可知，由于偏心式滑片与对心式滑片运动学特征有较大的差异，对滑片偏心式旋叶式压缩机的滑片运动分析，不能简单地采用对心式滑片的分析方法，由简化方法计算分析所获得的结论不能表明所研究气缸型线具有的运动学和动力学特性。 将旋叶式压缩机气缸型线的设计直接归结为滑片运动规律的建立，对旋叶式压缩机的密封性和工作腔容积进行分析，在保证滑片运动动力特性曲线光滑、连续的前提下，生成一条使得旋叶式压缩机性能更优的多项式滑片运动规律曲线，根据滑片运动与气缸型线的数学关系，得到满足滑片运动规律的气缸型线。与传统简谐气缸型线旋叶式压缩机相比，由多项式滑片运动规律曲线转化得到的旋叶式压缩机在保证滑片运动动力特性曲线光滑、连续的前提下，使得压缩机气缸与转子接触点处有更好的密封性，容积效率更高，在结构尺寸参数相同的条件下有更大的吸气量和排气量。 对滑片偏心式旋叶式压缩机基元容积进行全新建模，并进行仿真分析，对新型旋叶式压缩机与传统旋叶式压缩机进行基元容积的比较研究。表明在结构尺寸参数相同的条件下，新型旋叶式压缩机具有比传统简谐气缸型线旋叶式压缩机更大的吸气量和排气量。 在保证滑片顶部与气缸内壁接触的前提下，尽量减少接触力，有助于降低摩擦功耗，提高压缩机性能。设定滑片顶部与气缸内壁接触力为0，对滑片进行受力分析，并分别分析了各力随转子转速的变化，重点分析了与接触力密切相关的滑片背压力的变化情况，可知转子转速对滑片所受滑片槽的约束力影响不大，而滑片背压力随转子转速增大而减少。为滑片背压腔的合理设计打下理论基础。 通过将整个设计分析过程程序化，并建立一套基于C++Builder的旋叶式压缩机辅助设计分析系统，通过数据的相互流通，设计参数的改变可以非常直观的从面向对象的界面中反映出来，极大的简化了设计分析过程，加快了研发进度，为旋叶式压缩机新产品开发与分析提供了有力的工具。
[Abstract]:This paper is funded by the Open Fund of the State Key Laboratory of Mechanical Transmission (Project No. SKLMT-KFKT-200905).
At present, vane compressor has become the mainstream of automotive air conditioning compressor in the world. For the cylinder profile design of compressor, the original cylinder profile design theory for vane-centric compressor is lack of generality. This study breaks through the traditional design concept and directly attributes the cylinder profile design to the slider motion law. On the premise of ensuring smooth and continuous dynamic characteristic curve of the slider, a polynomial slider motion law curve which makes the performance of the rotary vane compressor better is generated. According to the mathematical relationship between the slider motion and the cylinder profile, the slider is satisfied. For the design of the back pressure chamber model of the compressor, the design of the back pressure chamber geometry is attributed to the establishment of the back pressure mathematical model. The back pressure mathematical model is mainly to control the contact force between the top of the slider and the inner wall of the cylinder, so as to reduce the friction power loss and improve the stress state of the slider. The research work of the compressor mainly includes the following research contents:
The advantages of eccentric vane rotary compressor are analyzed. The motion of the vane is simplified as the motion of the center of the main arc at the top of the vane by using the envelope principle of the equidistant curve. The kinematic model of the vane is established for the eccentric vane rotary compressor. The relationship between the displacement of the vane, the speed of the vane and the acceleration of the vane and the rotor angle is derived. The obtained theory is simulated and analyzed. The method avoids the complicated process of calculating the contact point of the slider and has the accuracy of the solution. A scientific and practical theoretical calculation method is proposed for the motion of the slider of eccentric rotary vane compressor which is widely used. From the analysis, it can be seen that because of the great difference between eccentric slider and concentric slider in kinematics characteristics, the method of analyzing the slider motion of eccentric rotary vane compressor can not be simply used to analyze the slider motion. The conclusion obtained by the simplified method can not show the kinematics and the kinematics of the cylinder profile studied. Dynamic characteristics.
The design of cylinder profile of rotary vane compressor is directly attributed to the establishment of sliding vane motion law. The sealing property and working chamber volume of rotary vane compressor are analyzed. A polynomial sliding vane motion law curve which makes the performance of rotary vane compressor better is generated on the premise of smooth and continuous sliding vane motion dynamic characteristic curve. According to the mathematical relationship between the slider motion and the cylinder profile, the cylinder profile which satisfies the slider motion law is obtained. Compared with the traditional simple harmonic Cylinder Profile rotary vane compressor, the rotary vane compressor transformed from the polynomial slider motion law curve ensures the smooth and continuous dynamic characteristic curve of the slider motion and makes the compressor gas. The contact point between cylinder and rotor has better sealing performance, higher volumetric efficiency, and larger suction and exhaust capacity under the same structural size parameters.
A new model for the unit volume of a sliding vane eccentric vane rotary compressor is developed and simulated. A comparison of the unit volume between a new type of vane rotary compressor and a traditional vane rotary compressor is made. The results show that the new type of vane rotary compressor has a better performance than the traditional simple harmonic cylinder type vane rotary compressor under the same structure and size parameters. Larger intake and exhaust volume.
On the premise of guaranteeing the contact between the top of the slider and the inner wall of the cylinder, the contact force is reduced as far as possible, which is helpful to reduce the friction power consumption and improve the performance of the compressor. The variation of back pressure shows that the rotor speed has little effect on the restraint force of the slider groove, but the back pressure of the slider decreases with the increase of the rotor speed.
By programming the whole design and analysis process and establishing a set of CAD and analysis system of rotary vane compressor based on C++ Builder, the change of design parameters can be reflected intuitively from the object-oriented interface through the mutual flow of data, which greatly simplifies the design and analysis process, speeds up the development of rotary vane. The new product development and analysis of compressor provide a powerful tool.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH45;U463.851
本文编号：2218053
[Abstract]:This paper is funded by the Open Fund of the State Key Laboratory of Mechanical Transmission (Project No. SKLMT-KFKT-200905).
At present, vane compressor has become the mainstream of automotive air conditioning compressor in the world. For the cylinder profile design of compressor, the original cylinder profile design theory for vane-centric compressor is lack of generality. This study breaks through the traditional design concept and directly attributes the cylinder profile design to the slider motion law. On the premise of ensuring smooth and continuous dynamic characteristic curve of the slider, a polynomial slider motion law curve which makes the performance of the rotary vane compressor better is generated. According to the mathematical relationship between the slider motion and the cylinder profile, the slider is satisfied. For the design of the back pressure chamber model of the compressor, the design of the back pressure chamber geometry is attributed to the establishment of the back pressure mathematical model. The back pressure mathematical model is mainly to control the contact force between the top of the slider and the inner wall of the cylinder, so as to reduce the friction power loss and improve the stress state of the slider. The research work of the compressor mainly includes the following research contents:
The advantages of eccentric vane rotary compressor are analyzed. The motion of the vane is simplified as the motion of the center of the main arc at the top of the vane by using the envelope principle of the equidistant curve. The kinematic model of the vane is established for the eccentric vane rotary compressor. The relationship between the displacement of the vane, the speed of the vane and the acceleration of the vane and the rotor angle is derived. The obtained theory is simulated and analyzed. The method avoids the complicated process of calculating the contact point of the slider and has the accuracy of the solution. A scientific and practical theoretical calculation method is proposed for the motion of the slider of eccentric rotary vane compressor which is widely used. From the analysis, it can be seen that because of the great difference between eccentric slider and concentric slider in kinematics characteristics, the method of analyzing the slider motion of eccentric rotary vane compressor can not be simply used to analyze the slider motion. The conclusion obtained by the simplified method can not show the kinematics and the kinematics of the cylinder profile studied. Dynamic characteristics.
The design of cylinder profile of rotary vane compressor is directly attributed to the establishment of sliding vane motion law. The sealing property and working chamber volume of rotary vane compressor are analyzed. A polynomial sliding vane motion law curve which makes the performance of rotary vane compressor better is generated on the premise of smooth and continuous sliding vane motion dynamic characteristic curve. According to the mathematical relationship between the slider motion and the cylinder profile, the cylinder profile which satisfies the slider motion law is obtained. Compared with the traditional simple harmonic Cylinder Profile rotary vane compressor, the rotary vane compressor transformed from the polynomial slider motion law curve ensures the smooth and continuous dynamic characteristic curve of the slider motion and makes the compressor gas. The contact point between cylinder and rotor has better sealing performance, higher volumetric efficiency, and larger suction and exhaust capacity under the same structural size parameters.
A new model for the unit volume of a sliding vane eccentric vane rotary compressor is developed and simulated. A comparison of the unit volume between a new type of vane rotary compressor and a traditional vane rotary compressor is made. The results show that the new type of vane rotary compressor has a better performance than the traditional simple harmonic cylinder type vane rotary compressor under the same structure and size parameters. Larger intake and exhaust volume.
On the premise of guaranteeing the contact between the top of the slider and the inner wall of the cylinder, the contact force is reduced as far as possible, which is helpful to reduce the friction power consumption and improve the performance of the compressor. The variation of back pressure shows that the rotor speed has little effect on the restraint force of the slider groove, but the back pressure of the slider decreases with the increase of the rotor speed.
By programming the whole design and analysis process and establishing a set of CAD and analysis system of rotary vane compressor based on C++ Builder, the change of design parameters can be reflected intuitively from the object-oriented interface through the mutual flow of data, which greatly simplifies the design and analysis process, speeds up the development of rotary vane. The new product development and analysis of compressor provide a powerful tool.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH45;U463.851
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