test conditions

1. Environmental conditions: temperature 23 ± 5 ℃, humidity 45% -75%

2. Test medium: Dry compressed air/nitrogen (dew point ≤ -20 ℃)

3. Test pressure: 0.01-1.6MPa (dual station can independently set pressure)

4. Time parameters: inflation 5-30s | holding pressure 10-300s | detection 5-30s | exhaust 2-5 seconds

5. Accuracy requirements: pressure accuracy ± 0.1% FS; leakage resolution 0.1Pa

6. Judgment criteria: pressure drop ≤ 0.005-0.05MPa/unit time; Leakage rate ≤ 0.01-10mL/min

Core testing content of duplex airtightness test bench

1. Dual station independent/synchronous pressure holding test

Two workstations inflate separately/simultaneously → maintain pressure → measure pressure attenuation; Detect leaks in the shell, welds, joints, and sealing rings

2. Differential pressure airtightness test

Dual station mutual reference/differential pressure comparison; Micro leakage measurement

3. Dual station quantitative leakage rate detection

Direct pressure/differential pressure/flow method; Automatically calculate the leakage rate (mL/min) and determine whether it is qualified/unqualified

4. High and low temperature airtightness

Double station synchronized entry into high and low temperature box (-40 ℃~120 ℃) for pressure maintenance; Extreme environment sealing verification

5. Verification of pressure resistance/burst sealing

Gradually increase the pressure to the rated withstand/burst pressure; Test the sealing strength of the structure

6. Dual station cycle durability and airtightness

Repeated inflation and deflation cycles (10 ³ -10 ⁶ times); Verify long-term sealing stability