Large and small head tile fault diagnosis method of reciprocated compressor connecting rod based on simulated indicator diagram

Abstract

The invention relates to fault diagnosis of a reciprocated compressor and provides a large and small head tile fault diagnosis method of a reciprocated compressor connecting rod based on a simulated indicator diagram. The method comprises the following steps of: based on a numerical simulation method, carrying out numerical simulation to obtain an air cylinder pressure change rule of a reciprocated compressor under an actual work state; drawing the simulated indicator diagram; and calculating gas pressure on a piston. Reciprocated inertia force of a set is calculated according the rotating speed of the set and the mass of a reciprocated movement part; and a whole stressing condition of the movement part is calculated by combining the gas pressure on the piston, so as to obtain a cross head pin theoretical steering point and a stressing state of a connecting rod large head tile. The reciprocated compressor is used for an online monitoring diagnosis system to obtain an impact vibration signal of a cross head part; and the fault of a connecting rod small head tile is analyzed and diagnosed by combining the theoretical cross head pin steering point and the theoretical stressing state of the connecting rod large head tile. The method does not need to mount a dynamic pressure sensor, namely large and small head tile faults can be diagnosed; and the cost is reduced and the risk of instructing a power hole or mounting the dynamic pressure sensor is avoided.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of reciprocating compressors, and relates to a method for diagnosing faults of large and small head tiles of connecting rods of reciprocating compressors based on a simulated dynamometer diagram. Background technique [0002] Reciprocating compressors are key units in process industry enterprises, especially in oil refining, chemical industry, and gas pipeline industries. At present, more and more reciprocating compressors are equipped with on-line monitoring systems. Due to the use of on-line monitoring systems, faults such as valve leakage, support ring wear, cylinder scuffing, and piston rod fracture can be effectively monitored and diagnosed. There is still no progress in the wear failure of large and small head tiles. [0003] Most of the research on the indicator diagram of reciprocating compressors at home and abroad starts from the shape change of the actually collected indicator ...

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Problems solved by technology

However, the vast majority of domestic reciprocating compressor units do not have machining display holes, which c

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