Cold Heading Die,Carbide Heading Dies,Heading Dies,Cold Heading Punches Chongqing Henghui Precision Mold Co., Ltd , https://www.citool.com
Pump axial displacement of the reasons
Pump work, the rotor position is fixed, so as to ensure that: First, the impeller exit and guide vane (or pump housing) center. Second, the rotor components (such as impeller) do not friction with the pump body. Fixed method is: 1, with a balance plate pump, balance plate itself is a positioning device. Due to its automatic adjustment of axial thrust, the rotor position is limited to a small variable range. 2, no balance plate pump, you should have thrust roller bearings. At this time, the axial thrust of the pump itself is balanced due to the symmetrical arrangement of the impeller or the opening of the balance hole. Remaining axial thrust has been very small, usually with radial roller bearings instead of thrust bearing. In spite of this, in fact, will encounter pump shaft around the move. For a pump with a balance disc, most of its movement occurs when the pump starts or stops, because the axial thrust disappears and the balance disc can not function as a positioner. In normal operation, the movement is very small, it is difficult to see. If the balance disc is worn out, the rotor will gradually move toward the entrance as well - to a new working position, though the amount of wear will take a long time to be seen. Positioning of the rolling bearing pumps, movement reasons are: 1, the bearing is not pressed on the end cover, that is, there is clearance. 2, thrust bearing damage. In addition to the above two reasons, the normal rolling bearing due to the existence of axial clearance, can also cause ranching, roughly between 0.20 ~ 0.50 mm, bigger pump movement larger, smaller pump movement less.