Device and method suitable for monitoring elevation change of bearing of turbo generator set

Abstract

The invention discloses a device and a method suitable for monitoring the elevation change of a bearing of a turbo generator set. The device comprises testing devices, a communicating pipe network and a data acquisition device, wherein the testing devices are arranged on a tested bearing seat; the communicating pipe network comprises a total pipeline and a branched pipeline; each testing device is connected with the total pipeline through the corresponding branched pipeline and a tee joint; and the input ends of sensors inside the testing devices are all connected with the input end of the data acquisition device. The invention realizes the elevation measurement of a tested bearing by utilizing the testing mode of the communicating pipe network, enlarges the monitoring range of a system, enhances the testing precision, the economy of the system and conveniently and reliably fixes the testing devices, has convenient testing and high testing precision, meets the requirements for monitoring the elevation of bearings of various traditional large-sized turbo generator sets and has wide application prospect.

Description

technical field [0001] The invention relates to the field of monitoring the elevation change of a steam turbine generator set bearing, in particular to a monitoring device and method suitable for the elevation change of a steam turbine generator set bearing elevation. Background technique [0002] At present, due to the influence of factors such as thermal expansion, condenser vacuum, and foundation subsidence of large turbogenerator sets, the elevation of each bearing in the cold state and the hot state will change greatly, thereby changing the dynamic characteristics of the bearing. It will lead to vibration faults such as oil film oscillation, steam flow excitation, dynamic and static friction, etc., which will directly affect the safe, stable and reliable operation of the unit. A large number of engineering practices have shown that the adjustment of the shafting elevation is an effective means of controlling the vibration of the unit. Therefore, it is of great signific...

AI Technical Summary

Problems solved by technology

This method can test the elevation change between any two bearings, but there are several problems when it is applied to the turbogenerator: (1) It can only test the elevation between any two bearings (or called a pair of bearings) Variety

When it is necessary to measure the elevation change of more than 10 points at the same time, not only the number of sensors, measuring devices, and analysis instrument channels are required, but also the change between any two points cannot be directly and real-time monitored; (2) large steam turbine The drop between the multiple bearing seats of the generator set is relatively large, often exceeding the measuring range of the instrument, and there is no height difference compensation function; (3) The surface of the bearing seat has radians, and it is not allowed to be fixed with screws after drilling holes on the surface. The test device and the bearing seat It is difficult to fix between surfaces; (4) The measurement accuracy is required to reach 0.05mm, and the requirements for the verticality between the float and the cup and the flexibility of the float movement are very high

(5) Since the pipeline is long and there are many bends when the pipeline is arranged, it is difficult to fill the connecting pipe with liquid

The test shows that the air bubbles in the pipeline have a great influence on the test results and affect the measurement accuracy of the elevation

The existence of the above-mentioned problems directly affects the application of the traditional connecting pipe method in the monitoring of the bearing elevation of the turbogenerator set.

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