Experimental Study on the Application of Hydrogen Detector in Engine Leak Detection
The use of hydrogen detector and leak testing equipment is a new technology to leak location. The paper summed up advantages and disadvantages between methods soap-bubble and hydrogen detection to find leaks. Analysis of influences the mixture gas of nitr
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Experimental Study on the Application of Hydrogen Detector in Engine Leak Detection Qi Wang, Wei Zhu, Lei Chen and Sanyan Cao
Abstract The use of hydrogen detector and leak testing equipment is a new technology to leak location. The paper summed up advantages and disadvantages between methods soap-bubble and hydrogen detection to find leaks. Analysis of influences the mixture gas of nitrogen and hydrogen on the leak testing equipment and theoretical analysis. Hope to help others. Keywords Three leaks
Leak detection Hydrogen detector Soap-bubble
Three leaks is a big problem in the production. In order to reduce the rate of leakage of the engine, engine manufacturers layout many leak detection stations in the production line. And it can effectively reduce the leakage and repair cost. In the leak detection process, to find the leak is the key to solve the problem of leakage. But with usual soap-bubble leak detection, part of engines with leakage rate exceeds permissible limit were unable to locate the leak, which increases the cost of repair. Therefore, to find new ways of leak location is still of great significance.
49.1
Introduction and Test Arrangement
The mixed gas of nitrogen and hydrogen is used as a tracer gas in hydrogen detection to locate the leak. The inspection equipment is hydrogen detector, as shown in Fig. 49.1. When looking for the leaks, the workpiece must be filled with mixture gas of nitrogen and hydrogen (Generally 95% nitrogen and 5% hydrogen mixed gas [1], 4% hydrogen in this paper, and the mixed gas is not combustible [2]), and maintain the pressure within a certain range (about 0.2 Bar), then find the possible leak points. If there is a leak, the handheld probe will be able to inspect the leakage of hydrogen and locate the leakage area. If the leak is large enough, Q. Wang (&) W. Zhu L. Chen S. Cao Faw Jiefang Automotive CO. LTD. Wuxi Diesel Engine Works, Wuxi 214026, China e-mail: [email protected] © Springer Nature Singapore Pte Ltd. 2017 Society of Automotive Engineers of China (SAE-China), Proceedings of SAE-China Congress 2016: Selected Papers, Lecture Notes in Electrical Engineering 418, DOI 10.1007/978-981-10-3527-2_49
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Fig. 49.1 Hydrogen detection device
the hydrogen detector alarms. In this paper, the hydrogen detection device model is INFICON ISH2000, as shown in Fig. 49.1.
49.2
Experimental Arrangement
Generally, under the same conditions, nitrogen and hydrogen mixture gas does not cause additional damage to the leak test equipment. In the experiment, filling, keeping and exhaust of the mixed gas are controlled by a leak test device. Adjusted the pressure of the mixture gas to about 5 Bar. Select engines as follows: (a) Oil passage: the leakage rate is greater than 600 cm3/min and cannot find the leak. If there is no engine exceeds 600 cm3/min, reduce the requirement. (b) Waterway: the leakage rate is greater than 15 cm3/min and cannot find the leak.
49.3
Experimental Study on the Hydrogen Detection Equipment with the Use of the Whole Engine L
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