PUMPING UNIT Russian patent published in 2002 - IPC

FIELD: attachment units for main circulating pumping units of primary heat-transfer loop of nuclear power plants. SUBSTANCE: pumping unit includes impeller pump whose housing is connected with drive motor by means of load-bearing spacer and supports ; each support includes bedplate supported by rollers and plate spring stack assembled in sleeve and pressed by adjusting screw driven in nut. Device includes rod received at spaced relation by coaxial holes found in adjusting screw, disk and bottom of sleeve. One end of rod is secured in bedplate and other end is located above butt of adjusting screw. Load-bearing spacer is provided with detachable brackets with thrust bolts for engagement with foundation. Sleeve of each support is located in body of adjusting mechanism for axial motion limited by locking screws. Body is located in bush made in supporting lug of load- bearing spacer for limited axial displacement and is provided with units for locking it in circumferential direction. Adjusting mechanism is provided with locking plate having central hole corresponding to shape of adjusting screw head embracing it. Thread of lower end of rod and respective threaded hole found in bedplate is of opposite direction as compared with thread of adjusting screw. Upper end of rod is provided with head for engagement with upper butt of adjusting screw. Rollers of upper and lower sets are mounted in body of support for radial displacement; they are placed in cages for motion over slots of holders. Center plate separating the roller sets is provided with aligning stops radially introduced through threaded holes found in body of support and intended for engagement with cages and center plate. Support is provided with separable base having cylindrical projection in upper portion and units for setting mutual perpendicularity of axes of rotation of rollers and fixation of said axes at angle of 45 deg relative to direction of motion of support. EFFECT: possibility of mounting/dismantling adjusting mechanisms of support in assembly without removal of supporting lug; avoidance of power effect on pipe lines of loop; avoidance of spontaneous unscrewing of screw; facilitated procedure of alignment of vertical axes of support and bush of supporting lug; avoidance of additional cargo-hoisting equipment; reduced overall dimensions of support. 4 cl, 5 dwg