| 摘要 |
PURPOSE: A leakage tester of a duct is provided to compact the tester for loading in a vehicle and to improve the accuracy by using an orifice. CONSTITUTION: An inlet portion(20) having a honeycomb(22) is formed in a cylindrical pipe. A fan sends air through the inlet portion to an outlet portion(30). A damper(32) for adjusting the flow is formed in the outlet portion. A gauge portion(70) comprises a large flow manometer(72), a small flow manometer(74) and a U-tube manometer(76). An orifice(40) is installed between the inlet portion and a blower(10) to measure the flow to the gauge portion. A tap for measuring differential pressure(42) having a tip pressure measuring unit and a back pressure measuring unit is formed in the orifice to measure the sealability of air inside a duct(60). Thereby, the leakage of air is reduced fewer than 5% and the energy is saved.
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