At present, the equipment configuration of industrial and domestic water supply systems basically meets the requirements of energy saving, safety and reliability. However, in the water lifting and water conveying system, due to the aging of the equipment, and the power of the pump unit is large and the voltage is high, it is necessary to increase the input of the speed regulating facility. Large, currently unable to achieve optimal energy-saving economic operation. As a fluid equipment, most of which are durable products, it is rare to upgrade and update once in the investment and construction. Therefore, it is recommended that the manufacturing units of fluid equipment should aim at the use of new technologies in the whole process of R&D, design and manufacturing, and the development of new products. Collect user feedback to improve the product, such as the surface treatment of the pump impeller, the pump casing, the inner wall of the pump seat, etc., using high-molecular super-slip metal anti-corrosive paint, and the high-efficiency sealing filler for the dynamic sealing part.
It is recommended that the construction and use units should have perfect and long-term considerations for the first investment to ensure that the system is energy-saving, economic, safe and reliable after completion and commissioning. The fluid equipment in the water supply system is relatively simple and efficient, and can be used with other electromechanical equipment in the water supply project. As a user in the water supply industry, the following requirements are imposed on the frequency converter. (1) The efficiency of the inverter is high. The inverter is used to control the pump unit. It is connected between the power supply and the motor, adding an additional energy-consuming device to the entire system. The water supply industry attaches great importance to efficiency. In the technical description of the inverter products, the efficiency of this product is greater than 0.98. This is too general, because the industrial inverters, in addition to the main body, there are auxiliary equipment, such as multiple phase shift transformers, PWM Rectifier line reactors, filters for suppressing post-inverter harmonics, pumping equipment for water-cooled systems, etc., are energy-consuming devices and should be explained in the technical specifications. (2) The inverter should have low harmonic content. The input stage of the inverter is a rectifier, which is the source of harmonic current. China has a certain limit on the injection of harmonic current into the power grid. The manufacturer of the frequency converter should account for the harmonic content produced by the product. The output voltage of the inverter should be low-glitch and should not be compatibilized for the motor being controlled. (3) The water supply industry has no special requirements for the control function of the inverter. The control functions provided by the inverter products can meet the requirements of the water industry. Among these functions, the water industry pays more attention to the self-starting function after a short power outage.
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