Screw air compressor failure

　　Screw air compressor is a common type of air compressor. The failure of screw air compressor will affect its service life and personal safety of operators. Therefore, in industrial production, it is very important to understand the failure of screw air compressor.

　　1. Fault phenomenon: The exhaust temperature of the unit is high (more than 100 °C). · The coolant level of the unit is too low (it should be seen from the oil sight glass, but not more than half); · The oil cooler is dirty, how to determine the cooling Whether the device is dirty, mainly depends on its inlet temperature and outlet temperature.

　　The temperature difference between the two, the normal temperature difference is between 20-30 degrees, if it is external dust blocking the cooling air only

　　Dry it with compressed air. If it can't be blown off, the internal heat of the radiator needs to be cleaned with a professional cleaning agent.

　　Wash, (such as heavy oil cleaning agent \ propyl copper / polyester dust, etc.), such as the internal blockage of the radiator needs to be used;

　　Pump cycle cleaning, cleaning time depends on the situation. If the water-cooled radiator is blocked, the best way is to open it.

　　The front and rear end covers are cleaned with iron bars inside the copper tube.

　　·The oil filter core is blocked;

　　·The temperature control valve is faulty (the component is broken);

　　·The oil-cut solenoid valve is not energized or the coil is damaged or the diaphragm of the solenoid valve is broken or aged;

　　·The cooling fan motor is faulty;

　　·The exhaust duct is not smooth or the exhaust resistance (back pressure) is large;

　　· The ambient temperature exceeds the specified range (38 ° C or 46 ° C);

　　· Temperature sensor failure (Intellisys control unit);

　　• Whether the pressure gauge is faulty (relay control unit).

　　2. Fault phenomenon: the fuel consumption of the unit is large or the oil content of the compressed air is large. · The cooling dose is too much. The correct position should be observed when the unit is loaded. At this time, the oil level should not be higher than half;

　　·The return pipe is blocked;

　　· The installation of the return pipe (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 coolant is degraded or overdue.

　　·Temperature is too high

　　3. Fault phenomenon: The unit pressure is low. · The actual gas consumption is greater than the unit output gas volume;

　　·The bleed valve is faulty (cannot be closed when loading);

　　· Intake valve failure;

　　· The transmission system is abnormal, the ambient temperature is too high, and the air filter is blocked.

　　·Load solenoid valve (1SV) failure

　　· The minimum pressure valve is stuck;

　　· The user pipe network has a leak;

　　· The pressure setting is too low;

　　· Pressure sensor failure (Intellisys control unit);

　　· Pressure gauge failure (relay control unit);

　　· Pressure switch failure (relay control unit);

　　· Pressure sensor or pressure gauge input hose leaks;

　　4. Fault phenomenon: the exhaust pressure of the unit is too high. • The intake valve is faulty;

　　· Hydraulic cylinder failure;

　　·Load solenoid valve (1SV) failure;

　　· The pressure setting is too high;

　　· Pressure sensor failure (Intellisys control unit);

　　· Pressure gauge failure (relay control unit);

　　· Pressure switch failure (relay control unit).

　　5, failure phenomenon: the unit current is large · the voltage is too low;

　　·The wiring is loose;

　　·The unit pressure exceeds the rated pressure;

　　·The oil separation core is blocked;

　　· contactor failure;

　　· Host failure;

　　· The main motor is faulty;

　　6, failure phenomenon: the unit can not start

　　·The fuse is broken;

　　·The temperature switch is broken;

　　·The wiring is loose;

　　·Main motor thermal relay action;

　　· Fan motor thermal relay action;

　　·The transformer is broken;

　　· Intellisys has no power input (Intellisys control unit);

　　· The fault has not been eliminated (Intellisys control unit);

　　· Intellisys controller failure.

　　7, fault phenomenon: the current is large or tripped when the unit starts

　　· User air switch problem;

　　· The input voltage is too low;

　　· The star-delta conversion interval is too short (should be 10 ~ 12 seconds);

　　· Hydraulic cylinder failure (no reset);

　　· Intake valve failure (opening is too large or stuck);

　　·The wiring is loose;

　　· Host failure;

　　· The main motor is faulty;

　　• 1TR time relay is bad (relay control unit).

　　8, fault phenomenon: fan motor overload

　　·The fan is deformed;

　　· Fan motor failure;

　　·Fan motor thermal relay failure (aging);

　　·The wiring is loose;

　　·The cooler is blocked;

　　·Exhaust air resistance

　　Failure analysis:

　　1. Screw air compressor failure phenomenon: the unit has high fuel consumption or compressed air contains large oil

　　The reason for this failure is: there is too much cooling oil, the correct position should be observed when the unit is loaded, at this time the oil level should be in the normal scale range; the oil separator is broken; the secondary return line is blocked; the oil quality problem; precision The filter element has not been replaced for a long time; if the oil temperature is too high, the oil content in the working air will exceed the standard.

　　2. Screw air compressor failure phenomenon: low unit pressure

　　The reasons for this failure are: the actual gas consumption is greater than the unit output gas volume; the screw air compressor deflate, the intake valve is faulty (cannot be closed when loading); the transmission system is abnormal; the ambient temperature is too high; the air filter is clogged; Load solenoid valve (1SV) failure; minimum pressure valve is stuck; user pipe network has leakage; pressure sensor, pressure gauge, pressure switch, etc. are not working properly; screw wear failure will cause low unit pressure; pressure sensor or pressure gauge input hose Air leak

　　3. Screw air compressor failure phenomenon: fan motor overload

　　Possible reasons are: leaf fan deformation; fan motor bearing failure; fan motor thermal relay failure (aging); loose wiring; voltage is lower than rated voltage.

　　4. Screw air compressor failure phenomenon: large unit current

　　The working voltage is lower than the rated voltage by 5% or more; the power supply cable is too long or the wire diameter is too small; the wiring is loose; the set pressure of the unit exceeds the rated pressure; the oil separation core is blocked; the contactor is faulty; the host is faulty; the main motor is faulty;