Fault analysis and troubleshooting of detection system of screw air compressor

one Cause analysis and troubleshooting of pressure detection system

1.1 oil filtration pressure detection system

The detection position of the oil filter pressure detection system is on the high pressure side (bp4) and the low pressure side (BP3). The gas pressure is converted into an electrical signal through the Kunshan air compressor pressure sensor and input into the CPU of the central processing unit. When the differential pressure is 0.7 kg / cm2, the alarm light on the control panel will flash; When the pressure difference reaches 1.4 kg / cm2, the alarm light on the control panel will flash. Not only will the alarm light flash, but also the internal bypass valve of the oil filter will open, and the lubricating oil will not pass directly through the oil filter.

In the main engine cylinder head, it will not cause the unit to shut down, but will bring dirty oil into the engine cylinder head and affect the service life of the engine cylinder head.

During more than ten years of operation, this part of the system has not failed, as long as it is maintained in strict accordance with the requirements of the manufacturer’s user guide. If the oil filter is changed for 50 hours for the first time and 1000 hours for the next time when the new machine is running, the oil filter system can work normally as long as the oil filter alarm light on the control panel flashes or reaches the replacement time.

1.2 fault analysis and troubleshooting of pipeline pressure detection system, including dry side exhaust pressure (bp2) and head exhaust pressure (BP1), as well as loading and unloading pressure detection circuit. 

Generally, we refer to the exhaust pressure on the dry side, that is, the gas pressure after separating the lubricating oil in the mixed gas through the oil-gas separator, while the exhaust pressure on the nose is actually the pressure of the mixed gas. Air and lubricating oil.

(1) Fault analysis and troubleshooting of exhaust pressure detection system. The exhaust pressure detection system mainly uses the pressure sensor to convert the pressure signal into electrical analog signal and transmit it to the CPU to control the operation or stop of the air compressor. At the same time, various parameters such as pressure value and pressure difference will be displayed on the display screen.

In case of abnormal exhaust of air compressor, check the pressure detection system first. In order to ensure the normal control of the pipeline system, the replacement method shall be adopted. That is, a new pressure probe should be replaced to try to determine if the pressure probe is damaged.

The pressure gauge is used to measure the pressure in front of the oil-gas separator in the oil cylinder. There is pressure drop due to the resistance of oil-gas separator, minimum pressure valve and pipeline. The pressure gauge shows a higher exhaust pressure than the instrument panel (may be lower during unloading). The pressure difference should be observed and compared frequently. When the differential pressure exceeds 0.1 MPa, the filter element of the oil-gas separator shall be replaced in time.

The temperature sensor is used to measure the exhaust temperature of the head exhaust port and display it on the instrument panel. It adopts PT100 platinum resistance as the sensitive element, with good linearity and high precision. In case of oil loss, insufficient oil and poor cooling, the exhaust temperature of the main engine may be too high. When the measured exhaust temperature reaches the alarm stop temperature set by the microcomputer controller, Kunshan air compressor will stop automatically. According to different models, the alarm shutdown temperature has been set at 105110 or 115 degrees before leaving the factory. Do not adjust at will.

Post time: Dec-06-2021