Air compressor, screw machine, piston air compressor and other accessories are probably explained

maintenance

Maintenance of air intake air filter

The air filter is a component that filters out dust and dirt from the air, and the filtered clean air is compressed into the compression chamber of the screw rotor. The particles inside the screw machine are only allowed to filter out within 15u. If the air filter plug is damaged, a large amount of particles larger than 15u enter the screw machine, which not only greatly shortens the service life of the oil filter and the oil separation core, but also causes a large amount of particles to directly enter the bearing cavity, accelerating the bearing wear and increasing the rotor clearance. The compression efficiency is reduced, and even the rotor is bitten and dead.

Oil filter replacement

After the first operation of the new machine for 500 hours, the oil core should be replaced. Use a special wrench to remove the oil filter. The new filter should be screwed with oil before the filter is installed. The filter seal should be screwed back to the oil filter seat and tightened tightly. It is recommended to replace the new filter element every 1500-2000 hours. It is best to replace the oil filter element when changing the oil. When the environment is bad, the replacement cycle should be shortened. It is forbidden to use the oil filter element for a long period of time. Otherwise, the filter element is severely blocked, the pressure difference exceeds the limit of the bypass valve, and the bypass valve is automatically opened. A large amount of dirt and particles will directly enter the screw main unit, causing serious consequences. The replacement of diesel engine oil filter and diesel filter core of diesel engine screw machine should be carried out in accordance with the maintenance requirements of diesel engine. The replacement method is similar to that of screw oil core.

Maintenance and replacement of fine oil separator

The oil fine separator is a component that separates the screw lubricating oil from the compressed air. Under normal operation, the service life of the oil fine separator is about 3000 hours, but the quality of the lubricating oil and the filtration precision of the air have a great influence on the life of the oil. It can be seen that in the harsh environment, the maintenance and replacement cycle of the air filter must be shortened, and even the front air filter should be considered. The oil fine separator must be replaced after expiration or before and after the pressure difference exceeds 0.12 MPa. Otherwise, the motor will be overloaded and the oil separator will break the oil. Replacement method: Remove the control pipe joints installed on the oil and gas tank cover. Remove the oil return pipe from the oil and gas tank cover into the oil and gas tank, and remove the upper bolts of the oil and gas tank. Remove the upper lid of the oil and gas tank and take out the oil. Remove the asbestos pad and dirt adhering to the upper cover. Install a new oil separator, pay attention to the asbestos pad must be stapled, the asbestos pad must be placed neatly when pressed, otherwise it will cause the pad. Replace the upper cover, return pipe, and control tubes as they are, and check for leaks.

Maintenance and replacement of screw air compressor parts oil

The quality of the screw oil has a decisive influence on the performance of the oil-injected screw machine. Good oil has good oxidation stability, rapid separation, good foaming, high viscosity and good corrosion resistance. Therefore, users must use pure The company's special screw engine oil.

The new oil replacement was carried out 500 hours after the new machine running-in period, and the new oil was replaced every 2000 hours after the operation. It is best to change the oil filter at the same time when changing oil. Use shortened replacement cycles in harsh environments. Replacement method: Start the air compressor for 5 minutes to raise the oil temperature to above 50 °C, and the viscosity of the oil drops. Stop running. When the oil and gas barrel has a pressure of 0.1Mpa, open the drain valve at the bottom of the oil and gas tank and connect the oil storage tank. The oil drain valve should be opened slowly to avoid the use of pressure-bearing oil to splash people's dirt. When the lubricating oil is dripping, close the drain valve. Unscrew the oil filter and drain the oil in each line and replace it with a new one. Open the filler plug and inject new oil so that the oil level is within the range of the oil mark. Tighten the filler plug to check for leaks. Lubricating oil must be inspected frequently during use. When it is found that the oil level is too low, it should be replenished with new oil in a timely manner. The lubricating oil must also be used to discharge condensed water frequently. Generally, it should be discharged once a week, and should be 2-3 days in a high temperature climate. Discharge once. Stop for more than 4 hours, open the drain valve without pressure in the oil and gas tank, drain the condensate, and quickly close the valve when the organic oil flows out. Lubricating oil is strictly forbidden to be mixed with different brands. Avoid excessive use of lubricating oil. Otherwise, the quality of lubricating oil will be degraded, the lubricity will be poor, the flash point will be lowered, and it will easily cause high temperature shutdown, causing spontaneous combustion of oil.

Fault detection

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

The reason for this failure is that due to too much cooling dose, the correct position should be observed when the unit is loaded. At this time, the oil level should not be higher than half; the oil return pipe blockage will also cause the screw air compressor to malfunction;

If the installation of the return pipe does not meet the requirements, the screw air compressor will consume too much fuel; the exhaust pressure will be too low when the unit is running; the oil separation core will cause the screw air compressor to malfunction; the internal separator of the separation cylinder will be damaged; The agent is degraded or used overdue.

2. Screw air compressor failure phenomenon: low unit pressure

The reason for this failure is that the actual gas consumption is greater than the output gas volume of the unit; 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; Solenoid valve (1SV) failure; minimum pressure valve stuck; user pipe network leak; pressure sensor, pressure gauge, pressure switch and other screw air compressor failure will lead to low unit pressure; pressure sensor or pressure gauge input hose leak ;

3. Screw air compressor failure phenomenon: fan motor overload

Fan deformation; fan motor failure; fan motor thermal relay failure (aging); loose wiring; cooler blockage;

4. Screw air compressor failure phenomenon: large unit current

The voltage is too low; the wiring is loose; the unit pressure exceeds the rated pressure; the oil separation core is blocked; the contactor is faulty; the main unit is faulty; the main motor is faulty;

5. Screw air compressor failure phenomenon: the unit exhaust temperature is high (over 100 °C)

The coolant level of the unit is too low; the oil cooler is dirty. How to judge whether the cooler is dirty or not? The temperature difference between the inlet temperature and the outlet temperature is mainly determined. The normal temperature difference is between 20-30 degrees. It is the external dust that blocks the heat-dissipating air. It only needs to be blown dry 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. If the internal heat of the radiator is blocked, it needs to be used; The cleaning time is determined according to the situation; if the water-cooled radiator is blocked, the best way is to disassemble the front and rear end covers with iron bars to clean the inside of the copper pipe; the oil filter core blockage will also cause the screw air compressor to malfunction; The oil-disconnecting solenoid valve is not energized or the coil is damaged or the diaphragm of the solenoid valve is broken or aged; the oil-disconnecting solenoid valve generally appears in the old model; the cooling fan motor is faulty; the exhaust duct is not smooth or the exhaust resistance (back pressure) is large The ambient temperature is outside the specified range (38 ° C or 46 ° C).

6. Screw air compressor failure phenomenon: the unit exhaust pressure is too high

Intake valve failure; hydraulic cylinder failure; load solenoid valve (1SV) failure; pressure setting too high; pressure sensor failure (Intellisys control unit); pressure gauge failure (relay control unit); pressure switch failure (relay control unit).

7. Screw air compressor failure phenomenon: the unit can not start

Broken wire is broken; temperature switch is broken; wiring is loose; main motor thermal relay is active; fan motor thermal relay is operating; transformer is broken; Intellisys has no power input (Intellisys control unit); Intellisys controller is faulty.

8. Screw air compressor failure phenomenon: large current or tripping when the unit starts

User air switch problem; input voltage is too low; 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); wiring Loose; the main motor, the main unit failure will lead to the failure of the entire screw air compressor; 1TR time relay is bad (relay control unit).

Optional screw air compressor knowledge

Exhaust pressure

Under normal circumstances, the diameter of the gas pipeline should be selected to reduce the loss of resistance and achieve long-term operation to reduce energy consumption. The greater the exhaust pressure of the compressor, the more energy is consumed. So don't use a compressor with too high exhaust pressure.

2. Exhaust volume

Calculate the actual total gas consumption w1.1-1.2 coefficient, as the model of the selected exhaust gas

3. Air quality

According to the requirements of the gas equipment for the compressor gas in the industry, the screw air compressor and supporting equipment should be purchased as appropriate.

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