| 摘要 |
An optimum clearance is established at the contact point of the compressor's rotor and cylinder, within which cylinder the rotor is eccentrically rotated to provide a crescent-shaped compression chamber, to minimize friction at that point while at the same time minimizing leakage therethrough from the high to the low pressure side of the compression chamber. This is achieved by initially coating the rotor's cylindrical surface with a self-lubricating material, such as TEFLON. Thereafter, when assembling the compressor, the cylinder is pivoted relative to the rear bearing plate until it engages the rotor and provides a contact point with zero clearance. To maintain this precise alignment, holes are then drilled and reamed through the front plate and into the cylinder and through the cylinder and into the rear plate, after which dowel pins are driven into the holes. When the compressor subsequently operates in its intended environment and under normal operating conditions, thermal diferentials between the rotor and cylinder may cause expansion of at least one of those elements as a result of which the self-lubricating material wears until a desired very close sealing fit, with minimum friction, is established at the contact point thereby optimizing the clearance thereat. |
