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Detection method for osmotic concentration of vehicle fuel tank welding point and connector

A detection method and technology of penetration concentration, which is applied in the field of detection of penetration concentration of welding points and joints of automobile fuel tanks, and can solve the problems of inability to measure the local concentration of welding points and joints, large penetration of welding points or joints, etc.

Active Publication Date: 2009-07-08
YAPP AUTOMOTIVE PARTS
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

This detection method cannot measure the local concentration of the welding points and joints of the automobile fuel tank, and it is impossible to know which welding point or joint has a large amount of penetration

Method used

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  • Detection method for osmotic concentration of vehicle fuel tank welding point and connector

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Embodiment Construction

[0009] like figure 1 As shown, the detection method of the automobile fuel tank welding point and joint penetration concentration of the present invention comprises the following steps: first the automobile fuel tank 2 is placed on the support 1 in the test box 6, and the test box 6 is integrally heated to make the test box When the air temperature in 6 reaches 36°C, turn on the internal circulation fan 5 in the test box 6 to keep the temperature field in the test box 6 uniform, adjust the heating intensity, and keep the air temperature in the test box 6 at 36°C for 1 hour; Then open the outer circulation air inlet 7 and the outer circulation air outlet 8 on the test box wall, and make the hydrogen and helium concentration of the fuel vapor in the test box stabilize at 3ppmC through the outer circulation ventilation system; then start the flame power detector 9, test box 6 The air in the flame enters the flame power detector 9 from the sampling port 11, and then returns to the...

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Abstract

The invention discloses a method for detecting the osmotic concentration of automobile fuel tank welding points and joints. The method comprises the following steps: firstly, placing the automobile fuel tank in a testing box, heating the testing box until the temperature of the air in the box reaches 36 DEG C, and opening an internal recycling air blower so as to ensure that the temperature field in the box is uniform and kept for 1 hour at a temperature of 36 DEG C; secondly, opening an external recycling air inlet and an external recycling air outlet on the wall of the testing box so as to ensure that the fuel steam hydrogen helium concentration is stabilized to be 3ppmC; and thirdly, starting a flame electrical detector, the air in the testing box enters the detector from a sampling port, and returns to the testing box from a sample return port; sleeving a Teflon air pipe on the sampling port, placing the pipe port of the Teflon air pipe at a point 5 millimeters above a welding point or a joint so as to measure the fuel steam hydrogen helium concentration of the point; and comparing the fuel steam hydrogen helium concentration with a background concentration so as to judge a specific position with larger osmotic quantity. The detecting method directly samples each welding point or each joint, and can quickly lock the specific position with overproof osmotic quantity.

Description

technical field [0001] The invention relates to a method for detecting the penetration concentration of welding points and joints of automobile fuel tanks. Background technique [0002] At present, the detection method for the penetration concentration of welding points and joints of automobile fuel tanks is to place the fuel tank in a tank with a volume of 8m 3 ~10m 3 In the airtight box, heat the airtight box so that the air temperature in the airtight box rises slowly from 20°C to 35.6°C within 12 hours, and then takes another 12 hours to lower the air temperature in the airtight box from 35.6°C to 20°C. During this process, gasoline penetrates from the fuel tank of the vehicle into the closed box, and the flame power detector draws air samples in the closed box through its sampling port to measure the penetration of gasoline in the fuel tank of the vehicle in the closed box. This detection method cannot measure the local concentration of the welding points and joints o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/02
Inventor 孙岩姜林管云祥胡江流
Owner YAPP AUTOMOTIVE PARTS
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