Description

In PV module workshops, the static mixing tube is crucial. It seals the junction box. This tube directly determines the uniformity of the potting compound. It also defines the curing quality. The tube safeguards long-term electrical safety. It is a core defense for module reliability.

For the Three Core Functions of Junction Box Sealing

Ensure zero defects in electrical insulation

Working principle: The potting compound performs critical tasks. It typically consists of two components. These are silicone or epoxy resin. It encapsulates and secures internal metal inserts. It also fixes cable cores permanently. The compound provides permanent electrical insulation. The static mixing tube forces uniform blending. Its precise internal spiral elements achieve this. They mix the A/B components thoroughly. This process leaves no dead angles. Its working principle resembles the Dynamic Mixing Tube‘s.

Importance: Any minor mixing unevenness causes issues. It leads to incomplete local curing. Soft spots or chemical impurities may form. These create weak points in insulation. High voltage or damp conditions pose risks. They can induce leakage current. Partial discharge may also occur. Electrical breakdown is another possible result. This leads to module failure. It even raises fire risks.

Build a long-term reliable moisture-proof fortress

Working principle: Evenly mixed potting compound forms a solid. This solid is dense and gap-free. It bonds perfectly with the junction box housing. It also seals the output cables effectively.

Importance: PV modules face decades outdoors. They endure sun, rain, and temperature swings. Improper mixing causes micro-pores or cracks. It also leads to poor interfacial adhesion. These become hidden paths for moisture ingress. Ingressing moisture corrodes internal electrical connections. This increases resistance and causes heating. It finally induces power degradation (PID). Connection failure can also result.

Ensures superior weather resistance and mechanical protection

Working principle: Fully mixed compound achieves design benchmarks. It resists high-low temperature cycling. The range is -40℃ to 90℃. It also resists UV radiation effectively. Thermo-oxidative aging resistance meets targets.

Importance: The junction box area experiences severe temperature swings. Poorly mixed compound cracks more easily under thermal cycling. It may also powder or delaminate from the housing. This loses structural support for internal chips and diodes. The compound then fails to protect them. It cannot withstand impacts from wind, snow, or hail.

Specific advantages in the junction box sealing process

Process Consistency: Static mixing tubes ensure uniform mixing quality. Each dispensing session achieves identical results. This eliminates fluctuations from manual stirring. It also removes variances from mechanical mixing. Every module’s junction box quality becomes standardized.

Production Efficiency: Static mixing tubes integrate seamlessly with automatic dispensing equipment. This enables continuous, uninterrupted potting operations. It perfectly matches the fast pace of assembly line production.

Pollution Prevention: The single-use feature eliminates cross-contamination risks. Different adhesive batches stay separate. This is vital for potting compounds. They demand extremely high electrical performance.

In summary, within the junction box sealing process, the static mixing tube is no ordinary consumable. It acts as a physical control hub for quality. It secures the fundamental premise of “uniform mixing”. This fully converts the adhesive’s material properties. They become the module’s required insulation, sealing, and protection.

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