Digital display measurement device of air gap of hydroelectric generating set

Abstract

The present invention relates to a digital display measurement device of an air gap of a hydroelectric generating set. Through adoption of a method of combining machinery with electronics, a vertical linear movement is converted to a transverse linear movement by means of two gear-rack structures in which gears mesh with racks; a potential brush is installed on a horizontal movement mechanism and is moved on a potential sensor so that a resistance value in a certain function relation with a transverse displacement is outputted; the resistance value is processed by a processing unit and displayed in a mode of an air gap real value. According to the invention, the problems that errors are large, data conversion is complex and a ruler is not able to enter into a certain depth between a magnetic pole and a stator core in a gap measurement in the prior art are solved, and therefore the air gap measurement is fast, accurate and visual.

Description

technical field [0001] The invention relates to a digital-display air gap measuring device for hydroelectric generating sets, which is suitable for measuring the air gaps of all hydroelectric generating sets, and is also applicable to some positions in other fields where relative gaps need to be measured, and has universality. Background technique [0002] The size of the air gap of the hydro-generator unit has a direct impact on the operating performance and technical and economic indicators of the unit. The gap measurement takes the minimum distance between the highest point of the magnetic pole and the stator core, so the air gap measurement must be accurate. At present, wooden or steel inclined rulers are mostly used to measure the air gap. The surface of the inclined ruler is coated with display agent, and then the inclined ruler is inserted between the highest point of the stator and the rotor magnetic pole. Or the outer diameter micrometer measures the thickness of th...

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Problems solved by technology

At present, wooden or steel inclined rulers are mostly used to measure the air gap. The surface of the inclined ruler is coated with display agent, and then the inclined ruler is inserted between the highest point of the stator and the rotor magnetic pole. Or the outer diameter micrometer measures the thickness of the inclined ruler at the scratched place, which is the air gap value. The defect of this measurement method is that it can only measure the values ​​​​at both ends of the magnetic pole, and cannot go deep into the middle part. Later, some improvements were made to the measurement tools. Change the inclined ruler into two inclined blocks, and the two inclined blocks form a cubic block after matching, and its thickness is slightly smaller than the air gap. One end of the two inclined blocks is welded to extend the handle. Then push the two inclined blocks tightly, use a vernier caliper to measure the staggered distance of the two handles, take out the measuring block, restore the staggered position of the two handles of the inclined block, and then use a vernier caliper to measure the thickness of the cube formed by the two inclined blocks, which is the measured value The obtained air gap value, although this measuring tool can be extended into a certain distance from the end to measure the air gap, but its reading is relatively cumbersome, and it may cause a large intermediate error when restoring the staggered position of the handle, resulting in insufficient readings accurate

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