Simulation of the Deformation and Contact of Scrolls in the Scroll Compressor
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Abstract The control of the clearances in a scroll compressor is crucial to ensure the reliability and efficiency of compressor, especially for the compressors without radial compliance mechanism. In this study, the fluid-solid-thermal simulation is conducted to get the temperature field, the pressure load distribution on scroll wraps. Then, the influences of the temperature, pressure and the inertial force on the deformation of scroll wraps are investigated. On these bases, the variation of gap size and potential contact between scroll wraps is analysed under various orbiting radii. It is shown that the deformation caused by temperature is more significant than the pressure and inertial force. The contact occurs even though orbiting follows the theoretical orbiting radius due to the positive radial deformation of scroll wrap and negative radial deformation of inner wall of fixed scroll.Keywords:
Scroll compressor
Based on assumptions and tests of the discharge temperatures land pressures for a scroll compressor, a simulation of radial deformations of the orbiting scroll wrap is performed. All simulations show that the radial deformation of scroll wrap varies complicatedly in outer part. Although the deformations are controlled by the temperature of scroll wrap, the inner pressures of scroll wrap can make the radial deformation more uniform. So reducing temperature difference between the discharge and suction temperatures, using the material with lower thermal expansion coefficient are several effective means to improve the performance of scroll compressor in engineering practice.
Scroll compressor
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Since scroll compressors contain gas pockets whose shapes and sizes change continuously, the flow fields inside the compressors are time dependent and three-dimensional. The spatial and temporal variations inside the gas pockets also induce unsteady flows between the gas pockets. This unsteadiness controls the mechanisms responsible for the behavior of the scroll compressor components and their interactions. The dynamic nature inherent in the scroll compressors affects the performance and reliability of the scroll compressors. To improve and optimize the scroll compressor design for better performance and reliability, information is needed to understand the detailed physics of the unsteady flows inside the scroll compressors. To provide the fundamental information needed, the unsteady flows in a scroll compressor are studied numerically. The system simulated includes upper bearing housing, scrolls, check valve, and discharge plenum. Refrigerant-22 is used as the working fluid. The unsteady flows inside and between the gas pockets are characterized by the instantaneous distributions of field quantities and the area- and mass-averaged parameters.
Scroll compressor
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Scroll compressor
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For the scroll wrap in small-parameter scroll compressor, its temperatures under stable operating condition are analyzed and the simulations for thermal deformation of scroll wrap height are performed. By fitting the simulations, a formula for simplified calculation of thermal deformation of scroll wrap height is proposed. The maximum deviations between simplified calculations for thermal deformation of orbiting scroll wrap height in a scroll compressor and simulations by FEM are no more than 5%, so the simplified calculation for thermal deformation of scroll wrap height is feasible. The experiment for the scroll compressor in which the orbiting scroll wrap is modified based on simplified calculation shows the modification for scroll wrap considering deformation of scroll wrap height can improve obviously the performances of scroll compressor. At the same time, reducing the temperature differences between the discharge and suction temperatures, limiting scroll wrap height, using the material having lower thermal expansion coefficient, and selecting a larger thickness of scroll wrap are other several effective means to reduce the influence of thermal deformation of scroll wrap height and to improve the performance of scroll compressor in engineering practice.
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A measuring system of scroll plates is designed for checking precise machining of scroll plates. With this system, the profile tolerance error can be obtained. In the system, the check result reflects work’s machining error directly because the secondary clamping error doesn’t exist here. It can be operated at the manufacturing site to check scroll plates to find the rejects directly on its own account.
Scroll compressor
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In order to obtain better axial hermetic seal of scroll compression chambers and hence a better performance for a scroll compressor, two modification methods for scroll wrap height are proposed based on the axial deformation of the scroll wrap. First, the design modification, which allows the scroll wrap height and its dimensional tolerances to be designed based on the axial deformation of scroll wrap in the basic shaft system, is suitable for mass production of scroll compressors. Second, the special modification, which allows the scroll wrap height to be modified based on the axial deformation of scroll wrap after its manufacturing, can be used for single-piece production of scroll compressor or for the scroll compressors available. A special modification was conducted for a scroll compressor, in which the orbiting scroll wrap was modified based on the simulation results of its axial deformation. According to the tests conducted later, the performance of the scroll compressor with modified scroll wrap can significantly be improved without deteriorating its original manufacturing precision.
Scroll compressor
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Curved surface conjugation theory of differential geometry and working process of scroll compressor are used to analyze and research fundamental conditions of scrollwrap gearing. And on this bases, a new type of hybrid scroll profile is developed. By means of description of new profile design and its implementation with AutoCAD, a new concept and way are presented for designing scroll compressor with variable crosssection scroll.
Scroll compressor
Section (typography)
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When scroll compressors are operated, the heat and force loads acting on scroll plates result in the deformation of them. The temperature distribution and deformations of scroll plates were researched in this paper. The simulation results show that the maximum temperatures of scroll plates are at the center of scroll profiles. And there are the maximum axial deformation values at the center of scroll profiles. The maximum radial and axial fit clearances of compressor are 59.5μm and 38.8μm respectively.
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Theoretical cycle of scroll compressor with second gas-injection is analyzed.The influence of second gas-injection on the capacity,power,energy efficiency and discharge temperature of scroll compressor is tested and analyzed at different evaporating temperature(-5~-20 ℃).The results show that the capacity of scroll compressor with second gas-injection increases 15%~30%,the energy efficiency increases 9%~19%,power increases merely 10%,compared with normal scroll compressor.
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