Waterproof performance is an important indicator to measure the performance of waterproof junction box. Certification test, the first aging pretreatment test, and then anti-scouring test, and then through the appearance of structural inspection and industrial frequency withstand voltage test to judge. Whether the test can successfully pass, depending on the degree of sealing protection of the Waterpoof junction box, the degree of sealing protection of the Waterpoof junction box directly affects the protection of finished components and the level of protection against leakage. About the traditional structure of Waterpoof junction box, its design and material defects in the certification test has been exposed.
The main phenomena of the failure of the Waterpoof Junction Box anti-flushing test are roughly divided into the following:
⑴ Waterpoof Junction Box sealed box body a lot of water;
⑵ Waterpoof Junction Box box and the backplane material does not match;
⑶ the Waterpoof Junction Box seal nut cracking failure;
⑷ the Waterpoof Junction Box in the aging pretreatment test box deformation;
⑸ the Waterpoof Junction Box seal ring aging pretreatment test failure, or other reasons.
Through the analysis of the failure phenomenon during the above test, the following reasons were obtained:
(1) the latch design of the box. The design of the latch is the main reason for the failure of the test. The two-buckle mode makes the force of the lid concentrated in two points, coupled with the large area of the lid under force, resulting in the rest of the force is very uneven. Especially at high temperatures, the remaining points are affected by thermal expansion and contraction, the material becomes soft with heat, resulting in blistering the junction box mouth, affecting the sealing of the box, thus failing in the IP65 waterproof test.
(2) The rubber material of Waterpoof junction box seal is not selected properly: Due to the selection of improper sealing materials, in Waterpoof junction box after 240 hours of aging pretreatment test, its elongation and shrinkage rate decreased, the hardness of the sealing material increased, reducing the sealing performance of the box body and cover, resulting in sealing can not completely seal the box body and cover of the slot, resulting in the infiltration of water, anti-scouring test failure.
(3) waterproof junction box box plastic and solar cell components of the sealant After aging pretreatment test, the adhesive failed.
