【Basic explosion-proof principle of positive-pressure explosion-proof distribution box】

1、Positive PressureStrengthexplosion-proofIsOneVariousspecialexplosion-proofform，Its coreguidanceAspect针IsHandleflammablePerformanceMineralQuality And igniteSourceIsolationDistanceOpen，StriveAchieveexplosion-proof的Energy-savingEffect。The main implementation method is through the coordination of the automatic control system in the explosion-proof control box and the gas circuit system, introducing argon gas from a safe area into the positive-pressure chamber. After thoroughly purging and replacing the combustible gas in the positive-pressure chamber, a certain working pressure is maintained inside the positive-pressure chamber to block the entry of combustible gas and conductive dust from the external hazardous environment, thereby achieving the explosion-proof purpose.。

2、based onPositive PressureStrengthCavityDomesticpressureMaintenanceSupportmethod，keyUpWithdivided intopossessRareExplainLiquidStation旋的Positive PressureStrengthWith And haveDrainDewCompensatealso的Positive PressureStrengthTwoVariousform；

3、possessRareExplainLiquidStation旋的Positive PressureStrengthIsThroughArgonStationContinuitycontinuouslyThroughDuringPositive PressureStrengthCavity， And ProtectionSupport Certainly 的MainstreamInteractionFastDegree，MakePositive PressureStrengthCavitypressureMaintenanceSupportinpressurerangePositionDomestic， And Positive PressureStrengthCavityDomesticGasAbilitycancontinuousGot it.ClearPhilosophy And replacement。Because argon gas continuously passes through the positive-pressure chamber, while meeting explosion-proof standards, it can also carry away the heat generated by the operation of internal components, making it more suitable for installing electrical components or equipment with relatively high heat output, such as variable frequency drives, soft starters, high-power thyristors, and motors.。The disadvantage is that the required gas flow rate is relatively large, and the customer's on-site pneumatic system must provide sufficient flow and pressure.。

4. Positive pressure with leakage compensation is achieved by the automatic control system monitoring the pressure in the positive-pressure chamber in real time and controlling the injection and discharge of argon gas through valves.。When the pressure in the positive-pressure chamber is too low, the intake solenoid valve is opened to supplement gas, raising the pressure to within the pressure range; when the pressure in the positive-pressure chamber is too high, the exhaust solenoid valve is opened to release gas, lowering the pressure to within the pressure range.。 Because ArgonStation And 没WithcontinuouslyMainstreamInteractionPerformance， So possessDrainDewCompensatealso的Positive PressureStrengthMachineShellDomesticsuitable forAssembleHeatValue Relatively Small的LowPressureElectricalComponentsdevice，Such asvariousautomaticcontrolsystemEtc.；

5、according toOurCountryStandardrequirements，Pressurized TypeExplosion-proof control boxalsoneedpossessInteractiveLock And Alarmfunction。That is, when the ventilation process of the positive-pressure chamber is not completed or the working pressure in the positive-pressure chamber has not reached the pressure range, the positive-pressure chamber cannot be powered on to ensure safety. When the working pressure in the positive-pressure chamber in use falls below the set alarm pressure low limit or exceeds the high limit, the automatic control system adopts adjustment measures and simultaneously emits an audible and visual alarm to alert personnel. When the adjustment measures taken by the automatic control system fail and the pressure continues to decrease or increase to the set power-off pressure low limit or high limit, the system must promptly disconnect the power supply to the positive-pressure chamber and stop operation.

6. Based on the above situation, the positive-pressure explosion-proof form differs conceptually from other explosion-proof forms. Under scientifically designed automatic control systems and argon pressure and flow rates, the positive-pressure cavity size design offers greater flexibility, allowing the production of relatively large and heavy products. Internal electrical components and equipment can be assembled according to customer requirements or by users themselves, greatly enhancing user expandability.。

Explosion-proof positive-pressure cabinets are suitable for use in factories such as petrochemical equipment, trawlers, metallurgy, pharmaceuticals, light industry, textiles, food, biotechnology, aviation engineering projects, and hazardous chemical warehouse facilities.。Suitable for Class IIA, IIB, and IIC T1 to T4 explosive dust or vapor environments; altitude shall not exceed 2000 meters; at 25°C, relative humidity below 95%; operating ambient temperature between -20°C and 40°C.。

Various ordinary measuring instruments, analytical instruments, digital display instruments, transformers, motor soft starters, variable frequency drives, microcomputer touch screens, and general electrical components can be assembled according to customer requirements, with essentially no restrictions on internal electrical components.。

Distribution BoxByCabinet Body、SelfControlsystem、曝StationsystemSoftComponents、Alarmequipment、Power Supplypower distributionsystemconstitute；The positive-pressure chamber houses part of the explosion-proof components of the entire system and the customer's power supply and distribution components. The explosion-proof positive-pressure cabinet is made of Q235 thick steel plate, and all connection surfaces have undergone special sealing treatment. The air inlet of the explosion-proof positive-pressure cabinet is of the ventilation type, meaning an uninterrupted continuous gas path. The heat generated by the components inside the positive-pressure chamber can be carried away by the supplied gas, providing excellent heat dissipation performance.With the coordination of the control system, argon gas enters the explosion-proof positive-pressure cabinet, and the working pressure inside the positive-pressure cavity exceeds the pressure outside, creating a safe micro-positive-pressure environment, thereby preventing flammable hazardous gases from entering the positive-pressure cavity and ensuring the safe operation of internal general instruments and electrical components.。

The control system primarily performs a series of functions such as manual ventilation, air replenishment, high-pressure audible and visual alarm and exhaust, undervoltage protection alarm, and low-voltage interlock power-off.