Thrust bearing structure of small reactor shield pump

Abstract

The invention relates to a thrust bearing structure of a small reactor shield pump. An upper thrust bearing seat (15) and a lower thrust bearing seat (16) are fastened on a machine base (1) by bolts through respective extending outer edges, a compression spring (3) is arranged in the upper thrust bearing seat (15), a spring plate (4) is arranged at the lower part of the compression spring (3), the spring plate (4) is of an integral ring structure. Upper balance blocks (5) outside the spring plate (4) and the upper thrust bearing seat (15) are limited through balance block limiting pins (7), the adjacent upper balance blocks (5) and lower balance blocks (6) are matched through cylindrical surfaces on the lower balance blocks (6), and the upper balance blocks (5) and the lower balance blocks (6) are evenly distributed in the circumferential direction of the spring plate (4). A bearing is designed to be large in upper portion and small in lower portion, and the resistance moment is reduced on the premise that a smaller lower thrust pad meets the bearing requirement, and the bearing is designed to be of a structure with an upper spring and a lower rigid part, and a lower thrust pad is separated from a thrust disc in the process from starting to steady-state operation, so that the friction loss is reduced.

Description

technical field [0001] The invention relates to a thrust bearing structure of a small stack shielded pump. Background technique [0002] The outstanding feature of the small reactor is the integrated design, that is, the canned pump forms a module with the reactor and the evaporator, which is similar to the technical principle of the third-generation large reactor. The small reactor uses the canned pump to drive the primary circuit coolant to circulate between the reactor and the evaporator Realize the heat energy exchange between the core and the evaporator, generate high-pressure steam, and realize power generation through the generator set. The advantage of the small reactor is that it occupies a small area and can realize the multi-purpose of nuclear energy, such as urban heating and supply of industrial steam. [0003] The rotor and thrust bearings of the reactor canned pump are immersed in the cooling medium delivered by the pump. The rotor of the large-scale canned ...

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Problems solved by technology

Existing patent: water-lubricated two-way working thrust bearing device, publication number: CN205078606 U, suitable for large-scale reactor coolant shield pump, the structure is symmetrical up and down, and a two-way pre-tightened spring structure is adopted for impact resistance, and the upper and lower thrust pads always follow the thrust plate, so that The resistance torque is large when starting, which requires high starting performance of the canned pump, and the friction loss is also large during operation. If it is applied to the canned pump of a small stack with a small power, the friction loss at the bearing will make the canned pump low efficiency

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