Structure optimization method of main pump flywheel of canned motor based on gap circulation resistance characteristics

Abstract

The invention relates to the technical field of fluid machineries, in particular to a gap annular flow resistance characteristic-based structure optimization method for a flywheel of a main pump of a shielded motor. The method comprises the steps of establishing a pot-shaped gap annular flow test table, and measuring a law of change of resistance torques, along with a rotational speed, of the end surface and the cylindrical surface of the flywheel; non-dimensionalizing the rotational speed and the torques; fitting function relationships of non-dimensionalized torque coefficients and the non-dimensionalized rotational speed; calculating a rated rotational speed and resistance torques of the upper and lower disc surfaces of the flywheel in different shapes; establishing a change relationship, relative to the height of the flywheel, of the resistance torques of the flywheel under the rated rotational speed, wherein a height dimension corresponding to a position with a minimum total torque is a minimum energy consumption value; and obtaining the radius of the flywheel, thereby obtaining an optimal shape size of the flywheel when rotational inertia is unchanged. The optimization process is simple; and the optimal shape size of the flywheel under the condition of giving the rotational inertia can be quickly and accurately calculated to achieve the minimum energy consumption value of a main pump of the shielded motor, so that the running-out performance of the main pump of the shielded motor is improved.

Description

technical field [0001] The invention relates to the technical field of fluid machinery, in particular to a structure optimization method for a main pump flywheel of a shielded motor based on the resistance characteristics of gap circulation. Background technique [0002] Nuclear power, hydropower, and thermal power are the main power sources for power supply. In order to realize my country's nuclear power development plan, there are currently 52 nuclear power units in operation, under construction, or under construction. The nuclear main pump is a device used to pump cold water into the evaporator to convert heat energy. It is the key equipment for nuclear power operation to control the water cycle. At present, the shaft seal pump is mostly used as the core coolant main pump. Due to the emergence of previous nuclear accidents, countries have also put forward higher requirements for nuclear power safety. In order to improve the safety of the system in principle, the widely us...

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Problems solved by technology

[0003] However, in the process of increasing the radius of the flywheel, although the moment of inertia of the flywheel increases, the linear velocity of the flywheel surface increases, the deformation rate of the fluid in the flywheel gap increases, and the drag moment and viscous dissipation of the fluid in the flywheel gap also increase accordingly. As a result, the efficiency of the main pump of the canned motor is reduced, and the idling performance is deteriorated. Therefore, there is an optimal value for the diameter of the flywheel of the main pump of the canned motor, which makes the energy consumption of the main pump of the canned motor the lowest

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