A kind of drawing method of dynamometer diagram of reciprocating compressor

Abstract

The invention discloses a method for drawing a dynamometer diagram of a reciprocating compressor, including: S1, determining a standard dynamometer diagram, and defining and acquiring various parameters; S2, measuring all pressures of multiple complete cycles of the reciprocating compressor running stably Signal data, calculate the average value of the data points of the compressor in each complete cycle; S3. Randomly select multiple consecutive data points in the pressure signal data to obtain the pressure signal data of the compressor in a complete cycle; S4. Create An arithmetic sequence, set the traversal of the crank angle corresponding to the first data point in the pressure signal data as the value in the sequence, obtain multiple speculative dynamometers, and calculate the similarity scores between them and the standard dynamometer respectively; S5 , Find a speculative indicator diagram with the highest similarity score, and use it as the actual indicator diagram. The invention only uses one sensor to complete the drawing of the dynamometer diagram, which not only reduces the monitoring cost of the enterprise, but also improves the accuracy of the final result.

Description

technical field [0001] The invention relates to a method for drawing a dynamometer diagram, in particular to a method for drawing a dynamometer diagram for a reciprocating compressor using single sensor data, and belongs to the field of mechanical equipment fault diagnosis. Background technique [0002] Common reciprocating compressor systems go through four processes when they work, combined with figure 1 The schematic diagram of the partial structure of the shown reciprocating compressor will be described. [0003] When the piston moves from right to left, the gas volume in the cylinder decreases and the pressure increases. This process is the "compression" process of the compressor; when the gas pressure increases to a certain level, the exhaust valve opens and the piston continues Moving to the left, the gas continues to be discharged until the piston moves to the outer dead center position (that is, the far left side of the cylinder shown in the figure), this process i...

AI Technical Summary

Problems solved by technology

[0006] However, it can be known from the above operation description that the existing technology has very significant shortcomings in the actual application process.

First of all, because the existing technology needs to disassemble some parts of the compressor to determine the dead center position of the piston before signal collection, if the number of compressors to be monitored is large, only this part of the work will cause huge manpower and material resources consume

Secondly, after determining the dead center position of the piston, there may be errors when marking the corresponding position of the flywheel, which will affect the accuracy of the final result

Finally, because the drawing and monitoring of the dynamometer diagram in the prior art needs to be completed with the help of two sensors, the technical implementation cost is relatively high; moreover, the coupling requirements of the two sensors are high when they work together, and the long-term running state of the compressor Under these conditions, any sensor may have unexpected problems, which will affect the realization of the entire technical solution

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