Papers by Keyword: Scroll Compressor

Abstract: As the environment and customer are sensitive to compressor noise from refrigeration air condition system, it’s necessary to reduce noise level for scroll compressor to compete with piston one in this field. In this paper, we studied one way to detect noise resource and reduce noise level for scroll compressor; analyzed its vibration and noise characteristics; got the sound intensity distribution on the surface of compressor; performed the model test of the main part by using hammer strike and gained their intrinsic frequents. At last, by comparing the scroll compressor noise test results, sound intensity distribution, and intrinsic frequents, it was confirmed that upper shell resonation is the root cause to increase the noise. Also we gave a specific method, adding additional weight to upper shell, to avoid resonation. It’s proved to be efficient after test check.

Abstract: In order to make a quantitative description for the running status of the scroll compressor, a fault diagnosis method of information entropy is proposed on the basis of the theory of entropy. This method is based on singular spectrum entropy in time domain, power spectrum entropy in frequency domain, wavelet power spectrum entropy and wavelet space feature spectrum entropy in time-frequency domain, which is used as the comprehensive appraisal index of quantitative feature for vibration status of scroll compressor. Under condition of invariable speed operation, the identification of natural frequency of is carried out. Meanwhile, the influence of the axial vibration of moving scroll, radial compliance mechanism and slight liquid slugging on the scroll compressor is analyzed quantitatively. Three forms of periodic cataclysm of moving scroll under variable speed operation and the variation of information entropy with rotational speed are disclosed.

Abstract: For calculation of bending fatigue strength of scroll wraps, the pressure loads and temperatures in compression chambers based on general profile theory are analyzed, and a load model including the pressure loads the temperatures is proposed. For the scroll wraps, their load model for bending fatigue strength includes the pressure loads and the temperatures. Their pressure loads can be simplified on the mid-areas and its temperatures are equal to the temperatures of the mid-areas. The pressure loads are of π normal angle region inner pressure load which have an interval of π normal angle, the number of regions of pressure load is equal to the number of scroll compression chamber pairs. The discharge angle has significant effect on bending fatigue strength of scroll wraps and the stability of scroll compressor.

Abstract: 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.

Abstract: In order to improve the quality of the scroll compressor scroll plate assembly, presents computer aided matching system, establish the matching system framework, the scroll plate matching model contains a hierarchical relationship, the matching relationship between the parts and the matching principle information, to use .NET development platform and SQL Server 2005 database management platform, develop the matching system and manage a huge amount of matching data, making the matching process is quick, accurate, and matching interface is simple and easy to operate; Finally, to introduce the running of the whole system.

Abstract: The imbalance caused by eccentric sleeve radial compliance mechanism rotor system is a main issue in scroll compressor. In this study, the mechanical model of the structure with the eccentric sleeve behind the orbiting scroll is established, the offset level of the main and second balance weight inertia force action line and inertia force action line of the eccentric weight, as well as the effect of this deviation on the second balance and the main and second bearing loads were investigated in terms of working principle, structure and loading. The results show that the structure has great influence on scroll compressor rotor system balance in reducing orbiting radius regulation. It is suggested that the correlated parameters should be optimized in designing radial compliance mechanism structure.

Abstract: The optimization of structural parameters of the scroll compressor is realized by using the method of collaborative optimization. The mathematic models of scroll compressor are established and the Multidisciplinary Design Optimization(MDO) problem is solved by using the iSIGHT software. An example of scroll compressor based on MDO was given to verify the validity and practicability of the model. A set of size parameters which satisfy multiply performance requirements are obtained. The simulations results indicate that both the optimal parameters of scroll compressor and improvement of energy efficiency ratio can be successfully fulfilled by collaborative optimization.

Abstract: Studies on leakage and friction have received considerable attention in scroll compressor, especially which between the fitting surface of orbiting scroll and fixed scroll, as they affect the scroll compressor performance. According to the scroll compressor working principle and structure, combined with the force model of the orbiting scroll, the overturning moment on the orbiting scroll was analyzed and verified by a specific example, in which the azimuth angle and of the overturning moment action line were calculated and compared. The results show that the overturning moment will have a significant effect not only on the leak and friction loss at the fitting surface of orbiting and fixed scroll, also on the dynamic characteristics of the orbiting scroll due to the linear change of the azimuth angle and the unstable of the azimuth angle . The result is helpful for the study on leakage, friction, and the dynamics and tribology coupling problem research of scroll compressor.

Abstract: In order to improve the dynamic characteristics of scroll compressor, according to the crankshaft bearing characteristics of scroll compressor, based on the forces and moment equilibrium equations of the crankshaft and compressor frame body, used the frame body forces and crankshaft bearing loads as a variable, analyzed the frame body forces in the best of conditions by changing the counterweights installation angle to control the crankshaft bearing design formulas, thus obtained counterweights quality and phase angle and other parameters, ensured the service life of the bearing, and obtained effective control of the crankshaft bearing load and frame body force, improve the operation reliability of scroll compressor, prolonging the service life. This paper puts forward a set of formulas, which are derived based on analysis of the loads at crankshaft of scroll compressor. The formulas can be used to determine the parameters of installation angle of the counterweight and the forces of loads at crankshaft for scroll compressor.

Abstract: In this paper, we obtain point cloud data on vortex disk surface of the scroll compressor with ATOS three-dimensional optical measuring instrument and complete the reconstruction of three-dimensional solid model in the CATIA software environment, by the reverse engineering technology, the problem can be solved for part of unmeasured surface. The final error analysis is done for the three-dimensional model. It shows that we should have a well-planning and adopt the reasonable methods both for measurement and data processing to facilitate surface reconstruction of the complex object and the precision of modeling. The problem unmeasured is solved by both of the data from multiple view and data substitution. We can use local surface data to substitute the most of surface data which is not available to make complex surface reconstruction for scanning and modeling of small object with deep slot.