With the increasing sales of screw air compressors, screw air compressor accessories have become a good market. The more screw air compressor parts are used, more and more problems are encountered in screw air compressor parts. In addition, the difference in installation, use and maintenance level of screw air compressor parts causes some problems It can be solved immediately, to a certain extent, it affects the normal operation of screw air compressor accessories, and even endangers the safety of screw air compressor accessories.
1. Fault diagnosis and analysis in the application of screw air compressor accessories
In the process of measurement, the transmitter often has some faults. The timely determination, analysis and treatment of the faults are vital to the ongoing screw compressor accessories. Based on the experience in daily maintenance, we summarized some judgment analysis methods and analysis procedures.
1. Investigation method: review the sparking, smoke, peculiar smell, power supply change, lightning strike, humidity, misoperation, and mismaintenance before the failure.
2. Intuitive method: Observe the external damage of the loop, the leakage of the pressure guiding tube, the overheating of the loop, the power switch status, etc.
3. Detection method of screw air compressor accessories:
1) Screw air compressor accessories open circuit detection: separate the suspected faulty part from other parts to check whether the fault disappears, if it disappears, determine the fault location, otherwise you can go to the next step to search, such as: intelligent screw air compressor The machine accessories cannot use remote communication normally. You can disconnect the power supply from the meter body, and use the method of adding a power supply on site to power on the transmitter for communication to see if the cable is superimposed with about 2kHz electromagnetic signals to interfere with communication.
2) Short circuit detection of screw air compressor accessories: Under the condition of ensuring safety, directly short-circuit the relevant part of the circuit, such as: the output value of the differential transmitter is too small, the pressure guiding tube can be disconnected, and the pressure valve can be taken from the primary Directly lead the differential pressure signal to both sides of the screw air compressor accessories, and observe the transmitter output to judge the plugging and leaking connectivity of the pressure guiding pipeline.
3) Replacement inspection of screw air compressor accessories: replace the suspected faulty part and determine the faulty part. For example, if it is suspected that the transmitter circuit board is malfunctioning, one can be temporarily replaced to determine the cause.
4) Subsection detection: Divide the measurement loop into several parts, such as: power supply, signal output, signal transmission, signal detection, check by subsection, from simple to complex, from table to inside, narrow the scope, and find out the fault position.
Working principle of screw air compressor accessories:
The differential pressure from the double-sided pressure guiding tube directly acts on the two-sided isolation diaphragm of the transmitter sensor, and is transmitted to the measuring element through the sealing liquid in the diaphragm, and the measuring element converts the measured differential pressure signal into corresponding The electrical signal is transmitted to the converter, and after amplifying and other processing, it becomes a standard electrical signal output.
2. Several application measurement methods of screw air compressor accessories:
1. Combined with the throttling element, the liquid flow is measured by the differential pressure value generated before and after the throttling element.
2. Use the pressure difference produced by the liquid's own gravity to measure the height of the liquid.
3. Directly measure the pressure difference of different pipelines and tank liquids.