Reciprocating compressor stepless gas amount regulating system used for explosive gas area

Abstract

The invention discloses a displacement stepless regulation system of a reciprocating compressor. The system comprises an explosion-proof hydraulic oil station, a hydraulic distributor, a servo motor, a reduction gearbox of the servo motor, an unloader, an explosion-proof control box, a sensor, a crankshaft encoder, etc. With the system added, the air displacement of the large reciprocating compressor can be regulated steplessly and continuously. At the same time, the electricity consumption of the compressor is reduced with the reduction of the air displacement. In the operation process of the compressor, the distributor always maintains one half of speed strictly and rotates synchronously with the reciprocating compressor. A periodic pressure pulse wave generates from high pressure hydraulic oil output from the oil station after the effect of the hydraulic distributor. The cycle length of the pressure pulse wave is the same with the rotary period of the compressor. The starting point of every period is before the compressing stroke of the reciprocating compressor and the pressure effect time and the pressure pulse width can be regulated. With the explosion-proof design adopted, the regulation system can be applied to the reciprocating compressor that is used in an explosive gas area (explosion-proof class: EExd II CT4).

Description

technical field [0001] The invention relates to a liquid variable displacement machine of a rotary piston or a swing piston, in particular to a stepless air volume adjustment system of a reciprocating compressor applied in an explosive gas area. Background technique [0002] In the petrochemical industry, transporting small and medium molecular weight gases, and high compression ratio gas compression occasions, reciprocating compressors cannot be replaced by other types of compressors due to their inherent characteristics. In view of the invariability of the displacement of large reciprocating compressors in process operation, it is necessary to add a stepless continuous adjustment system for displacement to adapt to changes in actual working conditions and ensure the smooth operation of its process flow. [0003] At present, several sets of stepless adjustment systems for the displacement of reciprocating compressors have been announced. US Patent Documents US4775299 and U...

AI Technical Summary

Problems solved by technology

If the backflow gas force reaches the maximum, that is, when the piston is in the middle of the cylinder, corresponding to 50% of the displacement, the gas force cannot reach the force required to close the intake valve, and the intake valve will be fully open. , so the device cannot realize stepless regulation below 50% of the displacement

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