Leak detecting method in production of large and medium-sized automobile air conditioner

Abstract

The invention relates to a leak detecting method in production of large and medium-sized automobile air conditioners. The leak detecting method comprises the following steps of: (1) filling high-pressure nitrogen, filling nitrogen into the pipe systems of large and medium-sized automobile air conditioner parts by using a filled helium recovery device so as to enable the gas pressure inside the pipe systems to achieve 2400-2600 kilopascals and enable the pressure holding time to be more than 6 seconds, and detecting large leak; (2) vacuumizing, and then filling helium and nitrogen mixed gas at the gas pressure of 750-850 kilopascals; (3) carrying out helium mass spectrometer leak detection, and carrying out helium mass spectrometer microleak detection on the parts by using a helium mass spectrometer leak detector; and (4) recovering the helium and nitrogen mixed gas, recovering the helium and nitrogen mixed gas inside the pipe systems of the parts by utilizing the filled helium recovery device so as to finish leak detection. According to the leak detecting method disclosed by the invention, overcomes the defect that the pressure needs to be maintained for 8-12 hours in the traditional leak detection by firstly filling the high-pressure nitrogen for the large leak detection of the large and medium-sized automobile air conditioner parts and then filling the helium and nitrogen mixed gas for the microleak detection of the large and medium-sized automobile air conditioner parts, the on-line detection of a production line can be realized, good production continuity is achieved, the leak detection effect is enhanced outstandingly, the product quality is ensured, and the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of manufacture and assembly of automobile air conditioners, in particular to a leak detection method in the production of large and medium-sized automobile air conditioners. Background technique [0002] During the production and assembly of large and medium-sized automobile air conditioners, the process flow stipulates a leak detection process for the air-conditioning piping system to check whether there is any leakage in the air-conditioning piping system. The usual method used in this leak detection process is: filling high-pressure nitrogen, leaving the air-conditioning piping system for 8 to 12 hours, and then checking whether the air pressure change of the air-conditioning piping system meets the regulations and whether there is any leakage. The biggest shortcoming of this leak detection process is that there is an obvious backlog of products in the production process of large and medium-sized automoti...

AI Technical Summary

Problems solved by technology

The biggest disadvantage of this leak detection process is that there is an obvious backlog of products in the production process of large and medium-sized automotive air conditioners, and it is impossible to achieve the same day input and output on the same day, which affects the timeliness of production and delivery.

When leaks are

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