The leakage form of the scroll compressor has been simplified to varying degrees.

The scroll compressor is a new type of volumetric compressor. It has the characteristics of high efficiency, low vibration, low noise, simple structure and good reliability. It is an ideal model for small displacement compressors. In recent years, researchers have done a lot of work in the research of scroll compressors, and have achieved certain results, but the leakage problem is still the main obstacle to the development of scroll compressors. This paper discusses the research results of scroll compressors in the past few years at home and abroad, and proposes their future research directions.

Leakage Models The leakage modes of scroll compressors are mainly through tangential leakage of radial gaps and radial leakage through axial gaps, in addition to these two major forms of leakage. In a scroll compressor that uses back pressure to balance the axial force, there is a leak in the working chamber and the back pressure chamber. However, the proportion of these leaks is small and will not be discussed here. Leakage fluid flow regime To establish a leak model, the flow regime of the working fluid passing through the leak path must be known. At present, most of the scroll compressors are sprayed with oil. Since the working fluid passing through the leak passage is an oil and gas mixture, the two-phase flow state is very complicated, which depends on the leakage passage gap between the swirl chambers and the oil. The viscosity of the liquid, the pressure difference between the two sides of the leak path, the speed of the compressor, and the shape of the swirl chamber are many factors. Therefore, the current methods for determining the flow regime have been simplified to varying degrees.

For the scroll air compressor, the amount of fuel injection is relatively large. Due to the sealing effect of the oil, after the entire gap is filled, the air leakage is small, and the mutual solubility of the air and the lubricating oil is poor, and the air content in the lubricating oil is poor. Very few. Therefore, it is considered that the leakage of working fluid is only lubricating oil, and the leakage of air can be ignored. The advantage of this simplification is that the model is simple, the calculation amount is small, and the disadvantage is that the error is large.