What does the loading pressure and unloading pressure of the air compressor mean, and what is the re

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 sensor 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), and this 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.

Loading pressure of air compressor: Usually when our unit uses compressed air, we use a normal working pressure as the set value. Under-the-pressure setpoints that we use may cause our units to not work properly.

In order to make the unit run normally, we set the lower limit loading pressure of the air compressor to maintain a stable pressure value.

The unloading pressure is the upper limit pressure of the air compressor. The maximum working pressure of the air compressor itself is the upper limit.

The relationship between the upper and lower limits of the pressure of the two.

The two pressures can be set by the operator according to the use case, and the purpose of automatic control of the equipment is achieved through pressure sensors, etc. The loading pressure is the lower limit value, and when the pressure is reduced to the lower limit, the air compressor will automatically load; On the contrary, the unloading pressure is the upper limit, and when the pressure rises to the upper limit, the compressor is unloaded.

1. Reasons for frequent loading and unloading of air compressors.

1. Control the cause.

As we all know, the exhaust pressure of the air compressor is the main basis for controlling the loading and unloading of the air compressor. If the difference between the two setpoints becomes smaller, it may lead to frequent loading and unloading of the unit. When the loading pressure value of the unit increases, the unloading pressure value decreases; Or simply the increase of the loading pressure value and the decrease of the unloading pressure value will make the loading and unloading cycle of the unit shorter, that is, the closer the loading and unloading pressure value of the unit is to the constant gas consumption, the more frequent the loading and unloading, and the greater the hidden danger of the safe operation of the equipment.

2. System reasons.

If the setting value of the loading and unloading pressure of the unit is normal, it can be considered whether there is pipeline blockage between the outlet of the air compressor and the gas storage tank. If the pipeline is blocked but not completely blocked, the compressed air circulation will be seriously blocked, and the gas pressure between the blockage point and the air compressor is difficult to remove quickly during the loading of the air compressor, resulting in the unloading pressure value reached in a short time and unloading. However, due to the limited air volume between the blockage point and the outlet of the air compressor, coupled with the system loss (such as filter drainage with air, refrigeration dryer regeneration) and a small part of the circulation to the air storage tank, the pressure quickly drops to the loading pressure value, and the air compressor is reloaded, and so on.

Second, the air compressor frequent addition and unloading processing method.

1. Control the treatment method of frequent loading and unloading caused by reasons.

This reason can be directly seen through the pressure display of the unit when loading and unloading, if there is indeed a change, it can be solved by ** calibration or remove the pressure sensor for detailed detection and re-installation of the sensor. Of course, it is also common for the measurement error caused by the blockage of the pressure sensor measurement line, and our usual practice is to use compressed air to purge the sampling line.

2. The treatment method of frequent addition and unloading caused by system reasons.

The cause of the system is more complicated, and it can be judged by the difference between the outlet pressure of the air compressor and the outlet pressure of the refrigeration dryer. Due to the large number of equipment in this pipeline, after long-term maintenance and observation, it is found that the equipment that is often easy to be blocked is:

1) Degreasing and dewatering filters;

2) The internal adsorption dryer of the refrigeration dryer A and B inlet switching valves;

3) The temperature regulation of the pre-cooler and evaporator in the refrigeration dryer is not good;

4) The one-way valve at the outlet of the dust removal filter is installed incorrectly or the valve stem and valve body fall off.

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.

What you mean by normal loading and non-unloading means that after the unloading pressure is reached, the air pressure goes up until the high-pressure protection stops; After reaching or approaching the unloading pressure, the machine does not unload, but the air pressure does not rise again, and it has been stable or close to the unloading residual pressure. If this is the first case above, check the air intake poppet valve, vertical and quiet venting valve, solenoid valve, and pressure switch (computer board machine check computer board) according to the troubleshooting. In the case of the first two cases, the machine is normal and there is no problem.

1. Definition of loading of air compressor:

In general, the unloading control of the add-and-eliminate hood makes the pressure of the shrinking gas of the pressure brother bridge vary between the PMIN pmax. PMIN is the lowest pressure that can ensure the normal operation of the user, also known as the minimum pressure value.

2. Definition of unloading of air compressor:

Generally speaking, when the pressure reaches the highest pressure value pmax, the air compressor mainly depressurizes and unloads by the following method: close the intake valve to keep the motor in a dry state, and at the same time empty the excess compressed air in the separation tank.

Loading means that the intake valve opens to start gas production, and unloading means that the no-load intake valve closes to stop gas production, and the two values are set according to production.

Loading means that the intake valve opens to produce gas, and unloading means that the no-load intake valve closes without producing gas.

Is the pressure difference between unloading and loading of the air compressor reasonable in kilograms? What are the disadvantages of this setting for air compressors?

The pressure difference between the unloading and loading of the air compressor is generally more reasonable between kilograms, so the difference between kilograms is within the normal range. This difference can be set to avoid frequent switching of the compressor, thereby extending the service life of the air compressor. Setting too large a pressure difference may have some undesirable effects on the air compressor, such as:

1.Frequent compressor switching: If the difference is too large, the switching of the compressor between unloading and loading will occur frequently, which will increase the load on the compressor and reduce its service life.

2.Excessive pressure waves: If the difference is too large, the pressure fluctuations between unloading and loading will become more pronounced, which will have an impact on the stability of the air system.

3.Increased energy consumption: If the difference is too large, the energy consumption of the compressor in the unloaded state will also increase, thus reducing the energy efficiency of the air system.

Therefore, for the setting of the unloading and loading pressure difference of the air compressor, it should be reasonably adjusted according to the specific use and equipment parameters to ensure the stability and energy efficiency of the air system, and prolong the service life of the air compressor.