| 摘要 |
<p>The gear pump of the invention comprises a driving rotor and a driven rotor which are held in a housing in an intermeshed manner. The two rotors have an initial engaging position of gears of thedriving rotor contacting with gears of the driven rotor on two positions where the gears separate, a position after rotating the initial engaging position, and expect the two positions which are moved with rotation, a three-point engaging position in which gears of the driving rotor contact with the gears of the driven rotor on an upstream side close to a rotation direction. In thethree-point engaging position, pressurebetween two positions of a downstream sideoftherotation direction, namelypressure of a downstream side space is higher than pressure between two positions of the upstream sideof the rotation direction, namelypressure of an upstream side space. In addition, a vertical bisector of a segment which connects the two positions on the downstream side of the rotation direction is deviated from an axis of the driven rotor, so that the driven rotor generates moment on the rotation direction. Through the structure, gear pump restrains wear even when moving fluid with relatively low viscosity is used.</p> |
