Both single-stage high-speed fans and multi-stage low-speed fans are fans. The ventilator is based on the principle of converting kinetic energy into potential energy, using a high-speed rotating impeller to accelerate the gas, then decelerate and change the flow direction, so that the kinetic energy is converted into potential energy. The flow of the fan is easy to adjust, the noise is low, and the pressure changes when the pressure changes, the pressure and the flow can be adjusted within a certain range. Fans generally use inlet throttling to adjust the flow and pressure, so that the fan runs at a lower power without the need for air conditioning, and it can maintain the same high efficiency as the rated working condition. Therefore, it is suitable for both pressure and flow. Stable situation.
The ventilator industry in China has been developed on the basis of the introduction, digestion and absorption of foreign technologies. After years of technological development and transformation, the technological level of leading companies in the industry, including processing and manufacturing technology, product testing technology, equipment set level, and system The design capacity has been greatly improved. Some enterprises of high-pressure stainless steel fans already have independent design, development and integration capabilities, and their competitiveness and market adaptability have been greatly improved. As China enters the stage of new-type industrialization, the basic industry is developing in the direction of large-scale equipment, environmental protection and energy saving. In response to this, the ventilator industry has gradually entered the upgrading and upgrading stage under the background of continuous improvement of its own technological level, and products are also being manufactured. Integration, energy efficiency, computerization of titanium fan design and production, and globalization of sales are developing. At the same time, user demand for fans is changing from product-oriented to life-cycle service-oriented.
Intellectualization At present, most of the ventilation system devices in our country adopt the traditional constant flow design. The fan is always operated under power frequency conditions, and the flow cannot be adjusted according to the actual heat change, resulting in waste of energy. For example, in the field of subway tunnels where ventilation systems are widely used, research on intelligent and efficient energy-saving technologies for steel fans is focused on the use of optoelectronic and temperature sensing technologies for real-time positioning of trains. The dynamic matching of working conditions and the application of intelligent frequency conversion adjustment make the exhaust heat operation of rail-mounted fans more energy-saving. The advantage of intelligence in energy saving and consumption reduction is obvious, which is one of the development trends of the future ventilation system.
The national policy of reform and opening up has enabled China's economy to develop at a high speed, while the quality of people's living and living conditions and the requirements of the production environment have been continuously improved, and it has also promoted China's construction industry to enter a booming track and accelerate the technology of HVAC fans. Development pace. As of 2003, there were 14 national-level standards for fans in China and several industry standards. After entering the WTO, China has further strengthened the revision of national and industrial standards for fans. Many fan standards have adopted ISO standards. The establishment and implementation of these standards have effectively ensured the quality requirements and technical development of ventilators in China. In terms of basic theoretical research of ventilators, China's research institutions in Beijing, Northeast China, Northwest China, Central China, and South China are basically balanced and involve ventilation. There are more than a dozen professional journals such as HVAC, fan technology, and fluid mechanics.
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