Explosion Proof Principle of PXF Series Positive Pressure Type Explosion-proof Distribution Cabinet
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1. Positive pressure explosion protection is a special type of explosion protection. Its main guiding principle is to isolate flammable substances from the ignition source and achieve the purpose of explosion protection. The specific implementation method is to cooperate with the gas system through the control system in the explosion-proof control box, introduce the protective gas from the safe area into the positive pressure chamber, and after the thorough cleaning and replacement of the flammable gas in the positive pressure chamber, Maintain a certain pressure in the pressure chamber to prevent the entry of flammable gas and conductive dust in the external dangerous environment, so as to achieve the purpose of explosion protection.
2. According to the pressure holding method in the positive pressure chamber, it can be mainly divided into positive pressure with dilution air flow and positive pressure with leakage compensation;
3. The positive pressure with diluted air flow is continuously flowed through the positive pressure chamber by the protective gas, and maintains a certain flow rate, so that the pressure of the positive pressure chamber is maintained within the working pressure range, and the gas in the positive pressure chamber can be continuously obtained. Cleaning and replacement. Since the protective gas continues to flow through the positive pressure chamber, the heat generated by the operation of the internal components can also be taken away when the explosion-proof requirements are reached. Therefore, it is more suitable for installing some electrical components or devices that generate a large amount of heat, such as a frequency converter and soft Starters, high-power thyristors, motors, etc. The disadvantage is that the required air flow is large, and the user's on-site air supply needs to provide sufficient flow and pressure.
4. The positive pressure with leakage compensation is detected by the control system in real time, and the pressure of the positive pressure chamber is controlled through the solenoid valve to control the inflow and outflow of protective gas. When the pressure in the positive pressure chamber is too low, open the intake solenoid valve to make up the air, so that the pressure rises to the working pressure range; when the pressure in the positive pressure chamber is too high, open the exhaust solenoid valve exhaust to reduce the pressure to the working pressure range. Inside. Since the protective gas does not continue to flow, positive pressure enclosures with leakage compensation are suitable for installation of low-voltage electrical components with low heat generation, such as various types of electrical control systems;
5, according to the requirements of national standards, positive pressure explosion-proof control cabinet must also have interlock and alarm functions. That is, when the positive pressure chamber ventilation process is not completed or the pressure in the positive pressure chamber does not reach the working pressure range, the positive pressure chamber cannot receive electricity to ensure safety. When the pressure in the positive pressure chamber under operation is lower than the lower or upper limit of the set alarm pressure, the control system adopts adjustment measures, and at the same time, an audible and visual alarm is issued to remind the user to pay attention. When the adjustment measures taken by the control system are invalid and the pressure continues to decrease or increase to the lower or upper limit of the set power cutoff pressure, the system shall promptly cut off the power of the positive pressure chamber and stop the operation.
6, from the above situation, the idea of ​​positive pressure explosion-proof type is different from other types of explosion-proof, in the control system and protective gas pressure, flow design is reasonable, the positive pressure cavity size design flexibility is greater, can produce more Large-volume products, and built-in electrical components and equipment can be installed according to user requirements or installed by the user, greatly enhancing the user's scalability.