Small flow test auxiliary impeller device for nuclear main pump

Abstract

The invention relates to a small flow test auxiliary impeller device for a nuclear main pump. A compression disk, a radial pin are adopted in the structure to fix a false shaft to a main pump shaft, ahexagonal nut is used for locking the false shaft, and the false shaft drives a centrifugal auxiliary impeller through a flat key; the impeller drives coolant to operate circularly in a small flow test loop, pressure moving upward in the axial direction is provided, and emergency circulation loop pressure is provided to simulate the operating condition of a real machine impeller; five inlet bending pipes, partition plates and spiral volutes constitute an inlet and an outlet of an auxiliary pump, and an end wall liner plate ensures an installation gap between the auxiliary impeller and the spiral volutes; and a cover ring, a compression ring and an improved impeller cover constitute a partition area of the auxiliary impeller device, the partition area is fixed to a pump body through bolts,the formation of a separation area between inlet and outlet channels of the auxiliary impeller in a pump shell is ensured. The small flow test auxiliary impeller device for the nuclear main pump hassimple structure, convenient disassembly and assembly, high applicability, and is suitable for small flow tests of nuclear main pump units with different orders of magnitude.

Description

Technical field: [0001] The invention relates to an auxiliary impeller device for a small flow test of a nuclear main pump. Background technique: [0002] The full-flow test and low-flow test of the nuclear main pump are the only criteria for the factory acceptance of the nuclear main pump, and whether its operation is normal or not directly affects the safety and economic benefits of the nuclear power plant. At present, the design and construction technology of the nuclear main pump test bench has been monopolized by developed countries such as Europe and the United States. The factory test of the nuclear main pump is mainly based on the full flow test. The design is extremely complicated, the construction cost is nearly eight times that of the small flow test circuit, and the test cycle is about three times that of the small flow test circuit. In addition, the whole test process must be equipped with equipment motors and real machine hydraulic components. It is inconvenie...

AI Technical Summary

Problems solved by technology

At present, the design and construction technology of the nuclear main pump test bench has been monopolized by developed countries such as Europe and the United States. The factory test of the nuclear main pump is mainly based on the full flow test. The design is extremely complex, the construction cost is nearly eight times that of the small flow test circuit, and the test cycle is about three times that of the small flow test circuit

And the whole test process must install equipment motors, real machine hydraulic components, inconvenient disassembly, unstable operation, power reaches 10,000 kilowatts during the test process, and the test cost is high

In order to ensure the safety of the system, most of the system components are made of carbon steel. Rust can easily pollute the circuit cooling water, pollute the sealing system and the cooling water system

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