三螺桿泵的結(jié)構(gòu)
Third, the structure of screw pump
它主要是由固定在泵體中的襯套(泵缸)以及安插在泵缸 中的主動螺桿和與其嚙合的兩根從動螺桿所組成。三根互相嚙合的螺桿,在泵缸內(nèi)按每個(gè)導(dǎo)程形成為一個(gè)密封腔,造成吸排口之間的密封。
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.
泵工作時(shí),由于兩從動螺桿與主動螺桿左右對稱嚙合, 故作用在主動螺桿上的徑向力完全平衡,主動螺桿不承受彎 曲負(fù)荷。從動螺桿所受徑向力沿其整個(gè)長度都由泵缸襯套來支承,因此,不需要在外端另設(shè) 軸承,基本上也不承受彎曲負(fù)荷。在運(yùn)行中,螺桿外圓表面和 泵缸內(nèi)壁之間形成的一層油膜,可防止金屬之間的直接接觸,使螺桿齒面的磨損大大減少。
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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