螺桿空壓機和活塞空壓機的優(yōu)缺點
Advantages and disadvantages of screw air compressor and piston air compressor
1、功能方面的比較
1. Functional comparison
（一）、力平衡方面
（1） . force balance
單螺桿壓縮機：螺桿承受的徑向和軸向氣體力可以自動平衡，星輪齒承受氣體力，要求星輪齒具有足夠的強度和剛度。雙螺桿壓縮機：螺桿轉(zhuǎn)子承受較大的徑向和軸向氣體力，要求螺桿具有足夠的強度和剛度。
Single screw compressor: the radial and axial gas forces borne by the screw can be automatically balanced, and the star gear teeth bear the gas force. It is required that the star gear teeth have sufficient strength and stiffness. The axial stiffness and radial strength of the twin-screw compressor are enough.
（二）、制造成本方面
（2） . manufacturing cost
單螺桿壓縮機：螺桿和星輪軸承可選用普通軸承，制造成本較低。雙螺桿壓縮機：由于兩螺桿轉(zhuǎn)子負荷比較大，要求選用精度較高的軸承，制造成本較高。
Single screw compressor: ordinary bearings can be selected for screw and star wheel bearings, with low manufacturing cost. Twin screw compressor: due to the large load of two screw rotor, it is required to select bearings with high precision and high manufacturing cost.
