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三螺杆泵的结构 |
三螺杆泵的结构
Third, the structure of screw pump
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。三根互相啮合的螺杆,在泵缸内按每个导程形成为一个密封腔,造成吸排口之间的密封。
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. Three mutual engagement of the screw in the pump cylinder for each lead of the formation of a sealed chamber, causing the seal between the suction mouth.
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。从动螺杆所受径向力沿其整个长度都由泵缸衬套来支承,因此,不需要在外端另设 轴承,基本上也不承受弯曲负荷。在运行中,螺杆外圆表面和 泵缸内壁之间形成的一层油膜,可防止金属之间的直接接触,使螺杆齿面的磨损大大减少。
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. Screw driven radial force suffered by the pump along its entire length of the cylinder bushing to bearing, therefore, does not require a separate bearing outer side, basically do not bear the bending load. In operation, the screw cylindrical surface and the pump cylinder wall formed between the layer of oil film to prevent direct contact between the metal, so that screw tooth surface wear significantly reduced.
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