What is the manufacturing process for fan manufacturers? !

The impeller is the core of the entire fan, and its tangents determine the performance of the fan. Although we have **accumulated a great deal of theoretical knowledge in the field of fluid machinery, simulating the changes in the tangents of the impeller along its circumference requires a lot of time and data collection through experiments. If one only creates a shell, it will never be possible to master the core technology. Domestic fan manufacturers generally use Soviet-era blueprints and a bulky design approach; the design parameters are sufficient as long as they fall within the operating range of the fans, allowing them to be kept in stock. For example, one fan may have an airflow rate of 20,000–50,000 m3/h, while another has an airflow rate of 8,000–29,000 m3/h. If the designed airflow rate is 26,000 m3/h, then in theory both fans can be used. However, using the first fan would result in higher energy consumption and more noise, which is not cost-effective. On the other hand, with the second fan, any slight change in the system conditions could result in insufficient exhaust performance. The European and American regions have accumulated a large amount of experimental data during the Industrial Revolution era; they emphasize customized production, namely the so-called target-centered design, in which components are selected based on specific design parameters before being manufactured, resulting in minimal fluctuations within the operating range. With the same parameters, the aerodynamic current is low and the operating current remains stable; it’s normal for the energy consumption and noise levels to be lower compared to domestic fans. The differences in parameters make it difficult to observe these advantages clearly. In the case of fans with high airflow rates and high static pressure, the differences in energy consumption and noise levels compared to domestic fans are significant, and the savings in electricity costs each year are considerable. The accompanying cables and frequency converters also require less space. Another issue is the overall manufacturing precision, impeller balance, welding techniques, compatibility of accessories, overall calibration, inspection standards, after-sales service, and so on. Domestic fans still have a long way to go. Foreign-funded enterprises, or even joint ventures, that demand relatively high standards are still inclined to trust imported brands for key positions. Of course, domestic fans also hold a significant share of the market, but they generally achieve this by compromising on energy consumption and noise levels; their performance varies from person to person, and they do not meet China’s current environmental and energy requirements. It is policies that drive progress in the fan industry, but fluid machinery is an industry in which progress is not so easy to achieve. Many companies even consider fans to be merely ordinary machinery, paying little attention to their quality and performance; as a result, it is difficult to promote and get recognition for good technologies, products, and services in this field. In summary, the situation described by the original poster does exist, but it certainly isn’t the trend of market development. Without its own core technologies, it’s merely a fleeting idea; as someone in this industry, I am well aware that the low-end market is already in a state of relative saturation. Future wind turbines will surely be those that are low in energy consumption and noise, meet high standards, have a compact design, offer rapid after-sales support, and provide high added value – only such turbines will be able to win the market. Attached is a picture of an exhaust fan that has been in use by an electronics company for 13 years:

Regarding the technical aspects you mentioned, definitely. The overall trend is fine too. But how many years will it take for this major trend to emerge? 10 years, 20 years, or 50 years? Given China’s current national conditions and market situation, individuals have no choice but to adapt. Each company also has a different positioning.

You are absolutely right; it is precisely the uneven but complementary manufacturing levels that provide companies with many options. Based on what I have seen and experienced over the years, it is recommended that, when making initial investments and if the budget permits, one should choose higher-quality options – I have seen too many appalling examples of wind turbines in use

Haha, it depends on the purpose. For long-term use, of course it has to be good. For some devices, you buy them, use them for a couple of days, and once they pass the inspection, you stop using them; in such cases, the cheaper ones are obviously better.