The pressure of the air compressor is normal, and it is not unloaded

Pressure switches.

Improper setting or elegantness after setting, the number of false reports;

Poor operation of the inlet valve, jamming and other reasons;

When the system stops using gas, the bleed solenoid valve fails, and the performance state is that the pressure is slowly going up, not like loading;

The control loop is faulty;

The loading solenoid valve is faulty, and the phenomenon is unloading but loading at the same time, and the amount of air loaded is greater than that of unloading, so the pressure continues to increase.

Air compressor maintenance precautions.

1. Wipe off the oil marks and water marks on the ground to prevent slipping.

2. Make sure the compressor unit has cooled down to prevent scalding.

Burns. 3. Cut off the power supply of the host and hang a sign at the power switch.

4. Open the manual venting valve, drain the pressure in the system, and keep the venting valve open.

5. For water-cooled machines, the water supply system must be turned off and the pressure of the water pipeline must be released.

6. Close the shut-off valve leading to the gas supply system.

to prevent compressed air from flowing back to the part being overhauled. Never rely on check valves.

to isolate the gas supply system.

The air compressor works normally without unloading, and there are the following situations:

1. The pressure of the air compressor has not reached the unloading pressure value set in the controller.

2. When the pressure of the air compressor has reached the pressure setting value in the controller and has not been unloaded, then check whether the unloading solenoid valve is opened.

3. If the unloading pressure value has been reached and the solenoid valve is normal, then check whether the unloading valve is stuck or whether the gas release pipeline is blocked.

4. Check whether there is any system software problem in the controller PLC.

Tianshui Jufeng's LGCY-23 27 fixed screw air compressor adopts the design idea of "large rotor, large bearing, low speed", and the speed is 30 50% lower than that of other brands, which can reduce noise and vibration, reduce exhaust temperature, improve rotor rigidity, prolong service life, and reduce susceptibility to impurities and oil carbide. The output of the compressor is connected to the gas tank, and there is a preliminary condensation in the gas tank, so it is often necessary to open the drain valve at the bottom of the gas tank frequently to drain water, or install a timed automatic drain valve to drain water regularly. A refrigerated refrigeration dryer is installed when the air tank comes out, so that the compressed air from the air tank quickly cools and removes most of the water molecules in the compressed air.

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There are two reasons for not unloading. One is that there is dirt in the check valve. The second is that the unloading mouth is broken.

The air compressor must have an unloading process because when the main pressure reaches 8 bar, the internal pressure of the machine will be greater than 8 bar.

If the air compressor continues to load and run when the rated pressure is exceeded during operation, the maximum pressure value will be reached, causing the screw air compressor to trip and stop, or the safety valve will operate. Stop directly, and the intake valve will close without urgency, resulting in fuel injection from the air filter. There needs to be an unloading process to reduce the pressure in the body of the machine and stop it only after the intake valve is closed.

The solution to the air compressor that cannot be unloaded:

1. Overhaul the pressure switch and replace it if necessary.

2. Replace the maintenance kit of the inlet valve and add lubricating oil.

3. Overhaul or replace the unloading solenoid valve.

4. Overhaul or replacement.

5. Check whether the loading solenoid valve is faulty, and replace the loading solenoid valve if necessary.

When the air compressor is in the running state, the pressure sensor on the air supply outlet pipe of the unit reaches the preset minimum working pressure value, and the air compressor begins to load (that is, the process of compressing air begins), and the preset minimum working pressure is the loading pressure of the air compressor.

In the same way, when the loading process of the air compressor is about to be completed, the pressure transmitter reaches the preset maximum working pressure, which triggers the unloading of the air compressor (that is, the intake valve is closed to stop the compressed air from bending), and the preset maximum working pressure is the unloading pressure of the air compressor.

Before starting, the oil pump control system is started first, and the oil pump control system ensures that the lubrication parts of the air compressor are well lubricated, and the oil pump control system can adjust the internal oil pressure and oil temperature through the built-in temperature control valve to meet the needs of the system.

When the motor is running at a constant frequency, the panel shows the pressure fluctuating up and down. Workaround: Replace it with another onePressure sensors

The value of the air supply pressure and the unloading pressure is too close: when the air compressor reaches the air supply pressure, if the air consumption suddenly decreases, the inverter will not have time to control the motor to slow down, which will cause excessive gas production, resulting in unloading. Workaround:

Set the difference between the supply pressure and the unloading pressure larger, usually the difference.

Precautions for the use of air compressors.

Air compressor disguised.

During operation, pay attention to the meter reading (especially the reading of the barometer) at any time, listen to the sound of each department, and stop the machine immediately for inspection if any abnormal situation is found. The maximum air pressure in the gas tank shall not exceed the nameplate.

Stipulate the pressure of the imperial demolition. Every 2 4h of work, the condensate oil and water discharge valve of the intercooler and the gas storage tank should be opened 1 2 times. Do a good job of cleaning the machine, after the air compressor has been running for a long time, it is forbidden to wash it with cold water.

When the air compressor is shut down, the exhaust valve of the gas storage tank should be gradually opened, the pressure should be lowered slowly, and the speed of the diesel engine should be reduced accordingly, so that the air compressor can run for 5 10 seconds at no load and low speed. After the air compressor stops, the diesel engine continues to run for 5 seconds at low speed and then stops. In winter, when the temperature is lower than 5 degrees, the unmixed antifreeze should be drained after the shutdown.

of cooling water.