Radial clearance In general, the radial clearance of a scroll compressor is composed of two parts, one part is a static gap formed due to machining error, insufficient assembly precision and wear of various moving parts (such as cross slip rings); The other part is the dynamic gap caused by the uneven bearing pressure of the bearing during the operation of the scroll compressor or the machining error of the brake mechanism. The dynamic clearance is rapidly changing during the operation of the scroll compressor. For the static gap, since the formation is related to the state of the meshing point of the movable scroll and the fixed scroll, the meshing points are formed by their mutual movement, and the profile wall surfaces forming the meshing points are different depending on the corners. Therefore, the static gap also varies with the corner. The coupling of the static gap with the change of the angle of rotation and the uncertainty of the dynamic gap makes it difficult to analyze the radial gap by a specific theory. This is also the reason why almost all scroll compressors consider the radial gap constant when analyzing tangential leakage.
The establishment of the tangential leakage model leakage model is related to many factors, namely whether it is stable flow, whether it is treated in one dimension, whether the leakage working fluid is compressible, and so on. And even with the same assumptions, there are different leakage models. Nozzle leak model: This model simplifies the large to small gap between the fixed scroll and the movable scroll into an ideal shrink nozzle. The tangential leakage process naturally becomes the flow through the ideal shrink nozzle. The working fluid of this model can be pure gas or a mixture of gas and lubricating oil, but must flow in a homogeneous manner. It is generally assumed that there is no heat exchange between the nozzle and the outside; there is no friction when the working fluid flows in the nozzle. As to whether the working fluid is an ideal gas, it can be calculated, but the complexity of the calculation is different.
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