Hot water leakage detecting process of pressure tube part

Abstract

The invention discloses a hot water leakage detecting process of a pressure tube part, and the hot water leakage detecting process comprises the steps that: a, part mounting: the pressure tube part is mounted on a plugging tooling and an open part of the pressure tube part is sealed; b, part warming: the sealed pressure tube part is submerged in hot water at a specified temperature and the temperature of the part is enabled to rise until being consistent with the water temperature; c, detection: leakage detecting gas is firstly filled into a closed inner cavity of the pressure tube part and the filling of the leakage detecting gas into the closed inner cavity is stopped when the gas pressure in the closed inner cavity reaches a specified value, and then an inspection result is obtained according to the changing situation of the gas pressure in the closed inner cavity within a specified time span; and d, part detachment. The hot water leakage detecting process has the advantages that through placing the pressure tube part in the hot water of which the temperature is equal to that of the practical working environment of the pressure tube part, inspection errors caused by differences of temperatures of the inspection environment and the practical working environment are avoided, the accuracy of sealing performance detection of the pressure tube part is greatly improved, the occurrence of mistaken detection is avoided, the commodity supply yield of products is increased, and smooth conduction of the production is guaranteed.

Description

technical field [0001] The invention relates to a technology for inspecting the airtightness of parts, in particular to a technology for inspecting the airtightness of pressure pipe parts. Background technique [0002] The water outlet pipe, thermostat cover and other series of parts in the engine cooling system are important parts of the automobile engine. This series of products needs to be press-fitted with pipe fittings of various shapes and specifications to form cooling water circulation channels. The joints of such parts and pipe fittings have high sealing requirements, and no leakage can occur. Therefore, the requirements for assembly quality are high, and the requirements for the sealing test of products after press-fitting are also high. [0003] For this type of pressure tube product in the prior art, the tightness test is carried out at room temperature, that is, the mouth of the part is sealed by the sealing device, and then the leak detector is used to inflate ...

AI Technical Summary

Problems solved by technology

Since the above-mentioned testing is carried out at room temperature, it is quite different from the actual working environment. In actual work, the temperature of the cooling water flowing in the product is relatively high, and the seam may be caused by thermal expansion and contraction at the joint of the pipe fittings due to thermal expansion and contraction. gaps, resulting in leakage

Therefore, when the products that have passed the inspection at room temperature are assembled on the engine for cycle tests, slight leakage often occurs, and the accuracy of room temperature inspection is poor, which seriously affects product manufacturing and supply.