Leak detection device and use method thereof

Abstract

The invention relates to a leak detection device and a use method thereof. The leak detection device comprises an upper pressing part which is configured to tightly press an upper preformed hole at the position of the upper preformed hole of equipment to be subjected to leak detection in a sealing mode, the upper pressing part comprises a gas channel, and the gas channel is communicated with the upper preformed hole; the leak detection device further comprises a lower pressing part which is configured to tightly press a lower preformed hole at the position of the lower preformed hole of the equipment to be subjected to leak detection in a sealing manner. The axial compression sealing mode is adopted for connection for leak detection, the requirement for deviation of the hole diameter is low, the adjustable range of the size in the compression axial direction is large, high universality is achieved, operation is convenient during use, adverse effects generated by secondary welding are eliminated, large compression force can be achieved in the axial direction, and sealing can reach the high grade.

Description

technical field [0001] The invention relates to the technical field of heat exchangers, in particular to a leak detection device for a PCHE microchannel heat exchanger and an application method thereof. Background technique [0002] PCHE microchannel heat exchanger (printed circuit board heat exchanger) usually consists of side plates and etched plates. The heat exchanger includes two sets of channels or multiple sets of channels. The most important part is the heat exchange core. Due to the process characteristics of diffusion welding or vacuum brazing, the general products are mostly upper and lower plane structures. After welding, it needs Carry out preliminary airtight leak detection, and enter the subsequent processing procedure after confirming that the product is welded qualified. The structure of the heat exchanger product core after welding is as follows: figure 1 As shown, there are four reserved holes on the upper and lower surfaces to connect the leak detection...

AI Technical Summary

Problems solved by technology

This kind of scheme has low requirements on product structure and high pressure bearing capacity, but it needs to be cut when removing the welded joint, and the generated residue will pollute the inside of the product; whether flame brazing, argon arc welding or secondary welding is used for joint welding, Due to the existence of the welding heat induction zone, the metallographic structure of the metal at the welding part will be changed, and when the structural parts of the product (such as connecting pipes or threads, etc.) are welded again at this position, hidden defects in the product will occur. Such as: weld bead strength reduction, weld bead embrittlement or weld bead impact resistance decline, etc.

In addition, joint welding requires professional welders and welding equipment, which is inconvenient to operate, and the welded joint parts for leak detection can only be used once, and the cost-effectiveness of use is low

Images