Mechanical fly ball adjusting jig and method for steam-driving auxiliary water feeding pump

Abstract

The invention relates to the technical field of over-speed test of a steam-driving auxiliary water feeding pump in a nuclear power plant, and particularly discloses a mechanical fly ball adjusting jigand method for steam-driving auxiliary water feeding pump. A bush pipe is arranged on the middle part of a fly ball adjusting wrench; a handle is fixedly arranged on the upper part of the bush pipe;a grabbing rod is arranged on the bottom of the bush pipe; the bottom end of the grabbing rod is inserted in an upper adjusting hole in a fly ball; the fly ball is connected to a pump shaft through threads; and one end of a magnetic force meter base is attracted to a pump shell through a magnetic end, and the other end is fixedly provided with a dial indicator. By adopting the mechanical fly balladjusting jig and method, adjusting precision is greatly improved, and on-site adjusting work is more visual and high-efficient.

Description

technical field [0001] The invention belongs to the technical field of overspeed test of steam-driven auxiliary feedwater pumps in nuclear power plants, and in particular relates to a mechanical flyweight adjustment tool and method for steam-driven auxiliary feedwater pumps. Background technique [0002] Taking the steam-driven auxiliary feedwater pump of a nuclear power plant as an example, the steam-driven auxiliary feedwater pump must undergo overspeed tests to verify that the speed of the electronic tripping device tripping pump (referred to as electric tripping) is the same as that of the mechanical tripping device tripping. Whether the speed of the pump (referred to as machine jump) meets the design requirements, if the speed of the mechanical trip does not meet the operating requirements, it is necessary to perform mechanical flyweight adjustments many times. That is to adjust the radial center of gravity position of the flyweight relative to the pump shaft. The metho...

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Problems solved by technology

This work is the most cumbersome and takes up the critical path of the unit during the adjustment period. There are many problems in the original mechanical flyweight adjustment work: the adjustment tools are common and the method is simple, and the adjustment accuracy is low. Repeated adjustments and verifications are required. "Gradually reduce the tripping speed range for adjustment; the adjustment period is relatively long. Generally, the above tools and methods need to be adjusted at least 3 times (each adjustment period is about 3-4 hours) before it can be adjusted to a suitable range. For example, adjust If the cycle exceeds 3 days, it will violate the operation specification of the nuclear power plant unit and need to withdraw the unit status; repeated adjustments increase the waste of manpower, material resources and construction period caused by cross-operation and work type cooperation, resulting in loss of power generation of the power plant, etc.

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