Compressor and counter weight

摘要

A compressor has a compression unit for compressing gas to a desired pressure, a drive shaft (25) and a balancer (30,31). The drive shaft (25) is connected to the compression unit for driving the compression unit. Imbalance on the drive shaft is generated due to movement of the compression unit. The balancer (30,31) is mounted on the drive shaft and includes a main portion and adjustable portion for correcting the imbalance on the drive shaft. Preferably, at least one of the weight and the shape of the adjustable portion is adjustable.