Analysis and treatment of air compressor safety valve opening accidents Jiang Dahao Our factory has 3 positive force 3m3 air compressors, 2 of which are very poor high temperature dust. Some time ago, one of the air compressors had an oil injection accident with the safety valve open. All the lubricants for the air compressor leak light.
Seriously affected production.
Afterwards, the reason for the opening of the safety valve was analyzed. In the general case, there were two failures of the 1 safety valve; 2 the air compressor could not be unloaded, resulting in the upper limit of the pressure of the full valve in the oil separator.
Principle The loading and unloading of the air compressor is mainly controlled by the pressure controller loading the solenoid valve unloading valve and the throttle head 1. The unloading valve is closed before the air compressor is started. When the air compressor is in normal operation, if the user system pressure is lower than the lower limit of the air compressor pressure, the air compressor pressure controller sends a signal to the air compressor. By controlling the loading of the solenoid valve, the air flow through the throttle head 1 is reduced. The unloading port is opened, the main engine continuously draws in air, the pressure of the oil separator is continuously rising, and the air compressor is loaded; when the oil separator is used. The pressure controller signals Dan. Then, the signal is sent to the loading solenoid valve, and the loading solenoid valve is de-energized.
Through the flow of the throttle head 1, the unloading valve opening is slowly closed. The air compressor is unloaded.
In addition to the failure of the safety valve itself, according to the control principle of the air compressor, the reasons for the opening of the air compressor safety valve may be caused by the following types of shuttle valves being stuck; the pressure controller is ineffective; the shuttle valve is connected to the tube of the oil separator. Road leakage; loading solenoid valve failure; throttle head 1 blocked; unloading valve malfunction; gasket under the unloading valve is damaged.
According to the above-mentioned possible reasons, we disassembled the shuttle and the throttle head. 1. As a result, the shuttle valve is very flexible, and the throttle head 1 is not blocked. At the same time, the possibility of leakage of the pipeline is basically eliminated by observation. The road is in good condition. The only thing left is that the unloading valve is loaded with a solenoid valve or a pressure controller. In order to improve the fault, we replaced the pressure controller, and after opening the air compressor 2, 1, the pressure of the air compressor exceeded the set. The upper pressure limit is still not automatically unloaded, and the pressure rises straight, and we immediately forced the air compressor to be shut down. At this time, a key factor was found. During the shutdown process, the air filter had oil mist and a small amount of lubricating oil was flowing out, indicating that the unloading valve must be asked because the air compressor was forced to stop. The unloading valve should be closed. When the unloading valve was disassembled, the spring was found to be jammed, and at the same time, it was found that there were fine particles in the valve. After cleaning the various components of the valve, reinstall the unloading valve, and then open the air compressor test machine, 10 such as the internal air compressor can basically load and unload. However, during the loading process, the pressure value of the oil separator does not raise the limit value of the safety valve opening. In response to this phenomenon and the conclusions drawn from the previous processing, we conclude that the gas is leaking somewhere in the unloading valve. The result of the soap bubble test is that the gasket under the unloading valve leaks, which may be caused by loading and unloading the valve. The sealant is not applied, resulting in poor airtightness. When the air pressure is unloaded, the unloading valve closes at a slower speed, and the pressure of the oil separator continues to rise.
After processing, it is also normal to check the loading solenoid valve. Subsequently, the air compressor is turned on, and the cutting operation is normal. This indicates that the opening of the air compressor safety valve is mainly caused by the malfunction of the unloading valve.
The failure of the air compressor is relatively concealed, and at the same time it involves mechanical electro-hydraulics and pneumatics, so it is difficult to troubleshoot. Through this successful troubleshooting, it shows that the above analysis of the above ideas is basically the correct communication address Fujian Steel Jiao 7365 Received, 5 cut 5;
pvc pipe mould,pvc corner plastic mould,pvc plastic moulding,PVC Pipe Fitting Injection die,PVC Pipe Dies Plastic mold
Dongguan Hongke Plastic Precision Mould Co.,Limited , https://www.hongkemolds.com