1. The machine selection is too small (mainly new machines)

How to judge that the air compressor is too small? The general procedure is to close the valve at the back of the air tank and then turn on machine. If the pressure of the pressure gauge above the air storage tank rises rapidly and can reach the rated pressure, open the back end of the valve to use air normally, and the pressure drops rapidly until it is lower than the minimum air pressure of the customer, then it can be confirmed that the compressor unit is small selected. If it is too small, the exhaust volume of the unit is less than the actual air consumption of production. A small number of users do not know the specific air consumption of their production at first, so they choose models according to their own estimates, resulting in the exhaust pressure not rising, lower than the actual required air pressure, and unable to meet the normal air consumption of the factory. When the user prepares to purchase an air compressor, he must first determine the working pressure required by the air end, then consider the pressure loss from the installation site of the air compressor to the actual air end pipeline, and properly consider the air allowance, and then Reasonable selection of air compressors. Of course, the size of the pipeline diameter and the number of turning points are also factors that affect the pressure loss. The larger the pipeline diameter and the fewer turning points, the smaller the pressure loss; otherwise, the greater the pressure loss. If the environmental conditions meet the installation requirements of the air compressor and the working conditions allow, it can be installed near the air end. When the distance between the air compressor and each air end pipeline is too far, the diameter of the main pipeline should be appropriately enlarged.

Technical recommendations for air capacity selection:

① Choosing the air capacity of the air compressor, you should first understand the capacity of all the air-consuming equipment, and multiply the total flow by 1.2 (that is, amplify the 20% margin);

② The new project can be selected according to the capacity value provided by the design institute (it is best to reserve a spare machine in the design);

Appropriate machine selection is beneficial to both the user and the air compressor equipment. If the selection is too large, it will cause serious waste. If the selection is too small, the air compressor will be in a loaded state for a long time, and the air will not be enough, and the pressure will not be up.

The steps for selecting an air compressor are: first determine the working pressure, then determine the corresponding air capacity, and finally the power supply capacity. The power selection is that the power supply capacity can meet the use power of the matched drive motor under the conditions of satisfying the working pressure and air capacity.

Second, the air compressor maintenance is not timely and serious, resulting in insufficient air production

The compressor displacement has dropped. First of all, how long has the compressor been maintained? If the environment is not ideal, check whether the air filter and oil are blocked after the compressor runs for 2000 hours. The light air filter can be dedusted with compressed air; in poor working conditions, it is necessary to replace three filters and one oil for timely maintenance. Sometimes the customer neglects maintenance, which leads to the blockage of the air filter and oil of the compressor, resulting in insufficient exhaust capacity of the machine. At this time, after replacing the three filters and one oil, it can be used normally.

3. The working pressure of the air compressor is set too low

After the air compressor is adjusted to the specified pressure according to the customer's needs, because the on-site user wants to save energy, the pressure is lowered below the workshop air pressure, resulting in the workshop pressure not rising. For example, the actual air pressure of the user is 7-8 bar, and the user can lower the set pressure through the panel to 5-6 bar or even lower, so the opening pressure of the back-end pneumatic equipment is not enough, and the user reports that the air pressure in the workshop is not enough, and the machine should be adjusted panel pressure at this time.

4. Loading and unloading failures cause the air pressure to not go up

After the air compressor is turned on, the internal pressure is established, and the machine is loaded. If the pressure cannot continue to rise and false loading occurs, the machine has a loading failure. At this time, you should check the loading and unloading solenoid valve, small piston or panel output near the intake valve. Check whether there is electricity or blockage, etc., and deal with loading and unloading faults in time.

5. The intake valve is not fully opened

Check the intake valve of the air compressor, remove the intake hose, turn on the air compressor, and check whether the opening of the intake valve is normal when loading. Generally, the theoretical design life of the intake valve is 100,000 times. Because each manufacturer uses different brands and batches, the quality is also different, so the failure of the intake valve will also lead to a decrease in the exhaust capacity of the unit. If the solenoid valve works normally when the compressor is loaded, but the intake valve cannot be fully opened, you can use a tool to forcibly open the intake valve. If it can be fully opened, it can be concluded that the decrease in the exhaust capacity is the failure of the intake valve and should be removed. Repair or replace.

6. Motor failure

Due to local faults in the motor coil, such as bearing wear and motor shaft wear, the motor speed is lower than the rated speed, which reduces the compressor displacement. At this time, the motor coil, bearing, etc. should be repaired, and the compressor displacement should be tested after repair.

7. Air leakage in the pipeline or increased air consumption in the workshop

You can first check the machine to make sure that the machine can inflate normally (reference method: close the ball valve at the back end of the air tank to inflate the air tank to see if the pressure of the trachea rises rapidly), and then check whether there are air leaks in the pipeline or ask the on-site management whether the air consumption in the personnel workshop has increased.

8.Environmental changes lead to a decrease in exhaust air capacity.

Elevated altitude and humid air lead to a decrease in the exhaust capacity of the unit. The higher the altitude, the thinner the air, and the smaller the air production per unit time; if the moisture in the air is too large, the compressed air contains a lot of moisture.

9. Decreased efficiency of the main engine results in insufficient air production

If the internal clearance of the air compressor main engine becomes larger or wears too fast, it will also cause insufficient air production of the machine. For example, the same equipment was just enough to meet production some time ago, but when the external environment was almost similar, it was suddenly found that the air pressure in the workshop was not enough, and the equipment could not be brought up. The front of the machine can meet the normal production, but suddenly the air in the back is not enough, and there are no other faults. In this case, the efficiency of the main machine can be finally confirmed after the previous reasons are eliminated.