In the production of bus air conditioning systems, the precision and stability of key processes directly determine the product's performance, seismic lifespan, and long-term reliability. From the manufacturing of the heat exchange core to the sealing of the piping system, every process must balance high strength and lightweight requirements. 

In recent years, with continuous innovation in welding, cleaning, and tube expansion process, the industry has made significant breakthroughs in improving heat exchange efficiency, reducing leakage risks, and achieving environmental compliance. Next, I will introduce several representative processes, including brazing, ultrasonic cleaning, non-shrink tube expansion, and high-frequency welding. I hope that today's introduction will give you a clearer understanding of the technical details in bus air conditioning manufacturing.

1. NOCOLOK brazing

The furnace is continuously protected by 99.9995% high-purity nitrogen, and the aluminum heat exchanger is integrally welded with noncorrosive flux. The temperature control accuracy of the brazing furnace is ±0.1°C, and the peak temperature uniformity achieved on the workpiece in the furnace is ±3°C.

NOCOLOK flux not only has the advantages of traditional flux, but also overcomes the disadvantages of post-brazing treatment and corrosiveness. NOCOLOK flux does not need any treatment after brazing, and has good corrosion resistance, plasticity and thermal conductivity. The neutral salt spray test can reach more than 1000h.

2. Ultrasonic cleaning

Main features: Full-automatic ultrasonic cleaning, using environmentally friendly water-based weak alkaline cleaning solution made of imported anionic surfactant and nonionic surfactant as main raw materials to clean parts, which can ensure the cleanliness of parts and effectively improve the subsequent brazing quality.

Vertical cleaning is adopted, and the inner cavity can be cleaned smoothly, which is more conducive to removing dirt on the surface and inner cavity of the cleaning part than ordinary horizontal cleaning machine. With a high degree of automation, only manual feeding and blanking are required, and no contact with cleaning agent is needed in the production process. On the one hand, it can reduce the corrosion of weak alkaline cleaning solution to human hands, and on the other hand, it can improve production efficiency.

3. High-frequency welding process

Main features: no-fire welding, avoiding the disadvantages of flame brazing such as high temperature, glare, smoke and noise, improving the working environment, simple operation and less dependence on talents.

The high-frequency welding process is characterized by uniform heating, full weld formation and high consistency of weld quality. Automatic welding can be realized through digital control.

4. Aluminum tube and aluminum sheet core

Main features: Compared with the aluminum sheet core of copper tube of the same specification, the performance of the aluminum sheet core of aluminum tube is the same through special expansion jointing process, with a weight reduction ratio of 27.7% and a cost reduction of about 21.6%.

5. Non-shrinkage tube expansion process

Main features: The non-shrinkable tube expander is the key equipment for processing high-quality air conditioning heat exchangers. It adopts multi-axis CNC technology, with full automation of workpiece height adjustment, expansion progress and cup forming. It has the characteristics of high degree of automation, 4% saving in raw materials of copper tubes, convenient operation and reliable performance.

As a professional electric bus air conditioner manufacturer in China, CLING bus HVAC offers all kinds of bus air conditioner solutions for 6-25m bus, citybus, coach, school bus, shuttle bus, special vehicles and battery thermal management system, on vehicle refrigeration unit  with shortest leadtime possible! 20 years professional experience and reputation guarantees the extraordinary performance!

If you have any questions please don't hesitate to contact us.

E-mail: marketing@clingac.com

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