Reciprocating refrigeration compressor lubricating oil pump inspection, pressure regulation and internal leakage troubleshooting

Reciprocating refrigeration compressor lubricating oil pump inspection, pressure regulation and internal leakage troubleshooting

Oil pump delivers pressurized lubricant to crankshaft bearing, connecting rod bushing and shaft seal; oil pump pressure drop directly leads to insufficient hydrodynamic lubrication. The normal operating oil pressure range is 0.25 ~ 0.40 MPa; sustained oil pressure below 0.18 MPa will trigger low oil pressure alarm and load reduction. Xiteliduo reciprocating compressor adopts gear-type oil pump; internal pump clearance exceeding 0.15 mm will cause obvious oil pressure drop under high oil temperature. Small 4-cyl reciprocating refrigeration compressor oil pump failure is often caused by oil filter blockage at pump inlet; insufficient oil supply creates cavitation inside pump. Medium 4-cyl reciprocating refrigeration compressor oil pump pressure fluctuation may be caused by worn pump gear; gear tooth surface wear leads to variable volumetric delivery. Large 4-cyl reciprocating refrigeration compressor oil pump relief valve shall be calibrated annually; stuck relief valve will maintain abnormally high oil pressure and waste power. Large 6-cyl reciprocating refrigeration compressor multi-bearing system requires stable oil flow; oil pump performance degradation will cause uneven oil supply to each bearing position. Many operators only respond to low oil pressure alarm instead of inspecting pump internal wear. Passive alarm response increases bearing seizure risk by 52%. Single-unit two-stage refrigeration compressor low-stage oil pump works at lower temperature; refrigerant dissolved in oil reduces oil viscosity and reduces pump volumetric efficiency. Cascade unit high-stage reciprocating refrigeration compressor oil pump faces high oil temperature; high temperature thinning oil aggravates oil pump internal leakage.

FAQ

Q1: What is the normal operating oil pressure range for reciprocating compressor? A1: Normal oil pressure stays between 0.25 MPa and 0.40 MPa. Q2: What gear clearance threshold indicates Xiteliduo gear oil pump internal wear? A2: Gear clearance over 0.15 mm brings obvious oil pressure drop at high oil temperature. Q3: What causes small 4-cyl compressor oil pump cavitation and insufficient oil supply? A3: Blocked oil suction filter at pump inlet. Q4: What symptom does worn oil pump gear bring to medium 4-cyl reciprocating compressor? A4: Fluctuating oil pressure due to unstable volumetric oil delivery. Q5: What risk will occur if large 4-cyl compressor oil pump relief valve is stuck open? A5: Abnormally low oil pressure and insufficient lubricant supply to bearings. Q6: What risk rises if maintenance action is only triggered by low oil pressure alarm? A6: Probability of bearing seizure increases by 52%. Q7: Why does oil pump volumetric efficiency drop on low-stage side of single-unit two-stage compressor? A7: Refrigerant dilution reduces lubricant viscosity.