它主要是由固定在泵体中的衬套(泵缸)以及安插在泵缸中的主动螺杆和与其啮合的两根从动螺杆所组成。
It is primarily fixed in the bushing in the pump (pump tank) and placed in the pump cylinder screw, and with the active engagement of the two driven screw formed.
泵工作时，由于两从动螺杆与主动螺杆左右对称啮合，故作用在主动螺杆上的径向力完全平衡，主动螺杆不承受弯曲负荷。
Pumps work, as the two screws driven screw symmetrical and active engagement, so the role of the active radial force on the screw entirely balanced, active screw does not bear bending loads.
泵工作时，由于两从动螺杆与主动螺杆左右对称啮合，故作用在主动螺杆上的径向力完全平衡，主动螺杆不承受弯曲负荷。
Pumps work, as the two screws driven screw symmetrical and active engagement, so the role of the active radial force on the screw entirely balanced, active screw does not bear bending loads.
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