PCB News - pcb factory; accessories, the vane of thermal product quality

PCB factory; accessories, the vane of thermal product quality

Because instant-heat products work in high-power, complex environments (humidity, interference), the manufacturing accuracy and stability of any of their accessories are very high or even demanding. The quality of each component is critical to the whole machine. The performance impact is great, and the data index is much higher than that of ordinary home appliances. It can also be said that every accessory of the thermal product is the vane of the quality of the thermal product.

In addition to the quality of the accessories themselves, there is another important issue for the accessories of instant products, which is the matching and coordination of accessories and other accessories in the use environment.

There are three ways to follow the quality of accessories, one is to find high-quality suppliers, the other is to research and develop special accessories with suppliers, and the other is independent research and development. Although the cost of the first type is low, the main problem is that the quality and stability of the accessories cannot be guaranteed; the second type is suitable for small and medium-sized enterprises despite the improved quality and stability, but the cost is also high; the third type, despite the high short-term cost, But the product quality and stability are guaranteed, suitable for large-scale and strong technical enterprises.

Matching and coordination of accessories and other accessories in the use environment. The best accessories are not necessarily the best when placed in a specific environment. They must be matched and coordinated with the environment used, or even special treatment. This process is also a process of exploration and exploration for each enterprise.

Such as the special treatment of the circuit board:

The circuit board is the main control part of the whole machine, which is mainly composed of electronic components. However, it is inevitable that a part of the PCB board of the instant electric water heater must pass a large current. The conventional method is that this part of the PCB adopts the method of stacking tin. The disadvantage is that when the component heats up and the connecting terminal heats up, it will melt the tin bar into a flowing liquid, causing a short circuit; the solution adopted in the product design is based on the current-carrying capacity requirements (the current-carrying capacity is considered according to the maximum power), and the cross-sectional area is calculated redundantly., According to the calculation results of the cross-sectional area, select a thick enough copper plate, directly stamp it into a suitable shape, paste it on the PCB board, and use the copper sheet as the current-carrying conductor to meet the requirements of long-term operation of the product, so it completely eliminates the need for work. Tin causes the hidden danger of short circuit.

Another example is the selection of main switching components:

The national standard requires that each electrical appliance must have a switching device that disconnects the entire circuit, and the instant electric water heater is a high-power electrical appliance. The selection of this main switching element is more demanding. The common practice is The relay is used as the main switching element. However, our technicians found in the design and production that the relay still cannot meet the requirements of long-term energization and high-current opening, and problems often occur after high-intensity work. After many experiments and debugging by our technicians, we have adopted AC contactor as the main control element. The main advantages of AC contactor are strong load capacity, resistance to current impact, strong breaking capacity of large current, various electrical and mechanical indicators. Much higher than the control relay.