Screw Air Compressor Once a fault occurs and you have a familiar understanding of the principle and structure of the compressor, it is not difficult to analyze and eliminate the cause of the fault. The analysis of the fault should start from the easiest and most convenient place. The following describes the analysis and treatment of several common faults. Screw air compressor Overhaul of high temperature First, the temperature of the equipment room is within the permissible range, and the oil level is in the normal state (please refer to the random description). To confirm whether the machine temperature measuring component is faulty, you can use another temperature measuring instrument for proofreading. If it is confirmed that there is no problem with the temperature measuring component, then check the temperature difference between the oil cooler inlet and outlet, which is normally between 5 and 8 degrees. If the temperature is greater than this range, the oil flow is insufficient, the oil circuit is blocked, or the temperature control valve is not fully opened. Please check the oil filter (use the alternative oil filter to consider whether the flow is insufficient). If there is pre-primary filter, please check . For some models, adjust the oil flow rate to the maximum. Check whether the temperature control valve is normal. You can remove the valve core, close one end of the temperature control valve, and force the oil to pass through the cooler. If the above method is not solved, it is necessary. Consider whether the oil path is blocked by foreign matter. If the temperature difference is less than the normal range, it proves to be poor heat dissipation. Please check if the water intake is insufficient, whether the inlet water temperature is too high, whether the cooler is scaled (waterway part), whether there is grease in the cooling (oil part), air cooling Check if the radiator is too dirty, if the cooling fan is abnormal, the air volume is insufficient, if the air duct is blocked, if the air duct is too long, the relay fan is not added, the relay fan is not turned on, or the relay fan is faulty. Is there grease in the radiator? If the temperature difference is within the normal range, the machine is still hot, indicating that the heat generated by the machine head is out of the normal range. It should be checked whether it is overpressured, whether the oil is wrong, whether the oil is aging, whether it is a bearing problem or even an end face friction.
1, fault phenomenon: the unit exhaust temperature is high (more than 100 ° C) unit lubricant level is too low (should be seen from the oil sight glass, but not more than half); oil cooler is dirty, need to use Special cleaning agent for degreasing treatment; oil filter core is clogged, need to be replaced; temperature control valve is faulty (component is bad), cleaning or replacement; fan motor is faulty; cooling fan is damaged; exhaust duct is not smooth or exhaust resistance (back pressure Large; ambient temperature exceeds the specified range (38 ° C or 46 ° C); temperature sensor failure; pressure gauge failure (relay control unit). 2, failure phenomenon: the unit fuel consumption or compressed air oil content; too much lubricant, the correct position should be observed when the unit is loaded, the oil level should be no more than half; the return line is blocked; the return line installation ( The distance from the bottom of the oil separation core does not meet the requirements; the exhaust pressure is too low when the unit is running; the oil separation core is broken; the internal separator of the separation cylinder is damaged; the unit has oil leakage; the lubricating oil is degraded or overdue. 3, failure phenomenon: the unit pressure is low, the actual gas consumption is greater than the unit output gas volume; the deflation valve is faulty (cannot be closed when loading); the intake valve is faulty and cannot be fully opened; the minimum pressure valve is stuck, need to be cleaned, re-adjusted or replaced Piece; user pipe network has leakage; pressure switch setting is too low (relay control unit); pressure sensor failure; pressure gauge failure (relay control unit); pressure switch failure (relay control unit); pressure sensor or pressure gauge input hose leakage gas. 4. Fault phenomenon: The exhaust pressure of the unit is too high; the intake valve is faulty and needs to be cleaned or replaced; the pressure switch is set too high (relay control unit); the pressure sensor is faulty; the pressure gauge is faulty (relay control unit); the pressure switch is faulty ( Relay control unit). 5, fault phenomenon: the unit current is large; the voltage is too low; the wiring is loose, check the traces of heat burning; the unit pressure exceeds the rated pressure; the oil separation core is blocked, need to be replaced; the contactor fails the main unit fault (the belt can be removed) The number of hand-cranked vehicles is checked. The main motor is faulty (the belt can be removed by hand and the number of turns is checked), and the starting current of the motor is measured. 6. Fault phenomenon: the unit can't start; the fuse is broken; the temperature switch is bad; check whether the main motor or the host is stuck, and whether the motor is reversed; the main motor thermal relay is activated and needs to be reset; the fan motor thermal relay is activated. Need to reset; transformer is broken; fault is not eliminated (PLC control unit); PLC controller is faulty. 7. Fault phenomenon: The current is large or tripped when the unit starts; the user air switch problem; the input voltage is too low; the star-delta transition interval is too short (should be 10— 12 seconds); the intake valve is faulty (the opening degree is too large or the card Dead); loose wiring, check for signs of heat; host failure (removable belt to turn the car to check the number of turns); main motor failure (removable belt to turn the car to check the number of turns) and start the measurement again Current. 8. Fault phenomenon: fan motor overload; fan deformation; fan motor failure; fan motor thermal relay failure (aging), need to re-adjust or replace new parts; loose wiring; cooler blockage; 9. Fault phenomenon: The host card is stuck, causing the unit to trip; the unit uses inferior lubricating oil, which causes the host's frictional resistance to increase under high temperature and high pressure, causing the host to bite; the main bearing is used for a long time and needs to be replaced; The installation of the wheel is incorrect. This article is edited by China DSNEAIR Compressor Manufactory ( Please indicate