| 摘要 |
PROBLEM TO BE SOLVED: To provide the detecting method and device for leakage in a heat exchanger for motorcar, which not only improve the utilizing rate of a machine as well as the reliability of leakage test but also remove restricting condition accompanied by the use of tracking gas and generate no charge for the method and device. SOLUTION: A heat exchanger 1 under testing is placed in a test chamber for the resistance to leakage and is connected to a pressurizing device 17, establishing the optimum air pressure in the internal cavity 2 of the same, then, the degree of vacuum around the heat exchanger in the test chamber for the resistance to leakage is established by a pump system, further, the existence of helium around the heat exchanger in the test chamber 24 for the resistance to leakage is detected by a helium leakage detector 30 whereby the existence of the leakage is tested. The test is carried out using helium existing in air naturally.
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