A non-uniform incoming flow suppression structure of the nuclear main pump connection pipeline

Abstract

The invention provides a structure for suppressing non-uniform incoming flow in the connecting pipe of the nuclear main pump. A deflector assembly is arranged in the connecting pipe, and the deflector assembly includes a long plate, a short plate, a first torsion plate and a second torsion plate; Both the plate and the short plate are rectangular flat plates, and an axial section passing through the pipeline axis is set as the datum plane. On the inner wall of the side; the first torsion plate and the second torsion plate are respectively fixed on the inner wall of the pipeline on both sides of the datum plane, and are mirror-symmetrical with respect to the datum plane; the shapes of the first torsion plate and the second torsion plate are twisted by a rectangular flat plate It is deformed, and the twisting direction is: twisting from the long board side to the short board side along the water flow direction. The suppressing structure of the present invention can suppress the non-uniform incoming flow in the pipeline under the condition that the overall water delivery speed of the connecting pipe remains unchanged, and ensure the stable operation of the nuclear main pump.

Description

technical field [0001] The invention belongs to the field of fluid systems, and in particular relates to a structure for suppressing non-uniform inflow of a connecting pipeline of a nuclear main pump. Background technique [0002] The reactor coolant circulation pump, that is, the nuclear main pump, is an important equipment related to the safe operation of the nuclear power plant. At present, in China's third-generation nuclear power technology, the coolant circulation system consists of a reactor and two loops, with a compact layout. Each loop has a steam generator and two vertical main pumps. The main pump is installed upside down on the steam generator. At the bottom, the U-shaped connecting pipe is omitted from the main pipeline, which reduces the resistance of the pipeline system. However, this design results in a short connecting portion of the nuclear main pump to the lower chamber of the steam generator, which causes the flow from the inlet of the nuclear main pump...

AI Technical Summary

Problems solved by technology

However, this design leads to a short connection between the nuclear main pump and the lower chamber of the steam generator, which causes the incoming flow of the nuclear main pump inlet to be non-uniform flow

[0003] Non-uniform incoming flow channel cross-sectional velocity distribution is uneven, and the velocity gradient is too large, which makes the main pump impeller blade and pump shaft stress unevenly, aggravates vibration and wear, and also reduces pump working efficiency; therefore, suppressing non-uniform incoming flow, It is critical to ensure the performance of the nuclear main pump

Images