【Pump Network Asia】 With the development of semiconductor technology, integrated full variable frequency pump more and more user's attention. In this paper, through comparison and analysis of the integrated variable frequency pump and conventional single-frequency and multi-frequency constant pressure water supply equipment, the paper expounds the high efficiency, energy saving, intelligence and integration of the integrated variable frequency control technology in the field of secondary water supply Other significant features. Wilo WILO cutting-edge technology: high efficiency integrated pump pump in the constant pressure water supply system I. Introduction Variable-speed constant speed water supply equipment from the nineties of the twentieth century to promote the use of our country is China's application of nearly 20 years The most extensive secondary pressurized water system. However, around the use of frequency control constant pressure water supply equipment users generally have better energy-saving effect, but the industry has always been more controversial. It is a key breakthrough and major innovation in the R & D of control technology of VVVF constant pressure water supply equipment that the successful application of integrated pump with integrated variable frequency control technology and its successful application in the field of secondary water supply. Efficient integrated variable frequency constant pressure water supply equipment is the most significant feature of high efficiency, energy saving, integration, and its promotion and application will lead the future construction of secondary water supply equipment, the dominant trend. Second, the energy-efficient integrated variable frequency pump theory 1, energy-saving principle of frequency control technology We know that in the frequency control water supply equipment, the key factors affecting the energy-saving effect of frequency conversion water supply equipment depends on the selected work in the system Whether the pump in the entire water supply process can be continuous and stable operation in the high-efficiency area. According to the similar law of the pump, on the same pump output power and speed, head and flow have the following relationship: From the above formula shows that when the lift is constant, the pump to reduce the amount of water, the same speed can be reduced, the pump power will decline rapidly , A substantial reduction in energy consumption. Frequency conversion constant pressure water supply equipment to achieve energy-saving principle is: When the working pump effluent is less than the rated flow through a frequency converter (single frequency conversion) and related components of the control circuit of electrical components, according to the system to achieve changes in the flow pump plus or minus Pump, and then through the frequency, frequency switching control of a pump group the purpose of the way. Even if each working pump for the equipment is equipped with frequency converter (multi-frequency), its mode of operation or in this way, but solved in each pump start and stop to achieve soft start, help to eliminate water hammer phenomenon, But the whole set of equipment is only a set of control system. The shortcomings of this technology is: due to its narrow range of high efficiency of the pump, the speed of the variable frequency pump changes within the range of 30Hz ~ 50Hz (that is, the pump output changes within the range of 100% ~ 60%), the energy saving effect is relatively obvious; When the pump speed is lower than 60%, the efficiency of the pump and the motor will be significantly reduced, with no energy saving or limited energy saving. When the frequency drops below 25Hz, the pump will not discharge water, the motor will not work effectively, and the energy waste still exists. 2, energy-efficient integrated variable frequency pump principle In the secondary pressurized water supply equipment for civil buildings, the actual operation of the system when the system water supply flow is a dynamic process of change. It can be said that most of the time the water demand are at a low state, the current common PLC composed of single (multi) frequency conversion water supply system, when a pump can not meet the normal water supply, the second pump due to efficiency reasons The minimum operating frequency constraints, the flow below 60% need to use more than 60% of the start-up frequency to run a second pump, is bound to result in a waste of energy. In order to solve the problem of energy consumption of the above system operation, we can realize the synchronous variable frequency operation of two or more than two pumps by using the highly efficient and integrated all-frequency conversion technology, that is, to realize the equal sharing of the efficiency of multiple pumps in the pump group and at the same time, A water pump are in high-efficiency operation, but also to overcome the frequency of water supply system, the minimum operating frequency control problems. Third, the highly efficient integrated full variable frequency pump application Integrated full variable frequency control technology, each pump is independently configured with a variable frequency controller, the pump controller on the inverter through the internal CAN bus technology, between multiple pumps Of the mutual communication, so that the entire device has a number of one-to-one with the pump to match the inverter and control of the brain, all pumps in the equipment to share system operating data and information, linkage balanced operation, to overcome the pump is not operating in high-efficiency zone to achieve real Full variable frequency control operation. 1. Product composition The system is mainly composed of high efficiency stainless steel multistage centrifugal pump, integrated frequency converter, control cabinet, backplane, stainless steel pipeline, valve and pressure tank. 2. Features a) Configure the integrated inverter intelligent frequency conversion high efficiency motor, built-in PID and advanced energy-saving software, precise control of performance output to meet the hydraulic requirements. b) decentralized control Each inverter built-in motherboard controller, and have an independent control of the operating function, the pump and the pump through the CAN bus linkage operation. When one pump controller fails, the other pumps can operate normally to supply water to the user. c) Energy-saving system In the same working pump group, all working pumps can realize synchronous frequency conversion operation, and can automatically and evenly distribute the operating efficiency according to the total demand of water (Figure 1). Compared with the traditional constant pressure frequency conversion water supply equipment (Figure 2) Saving more than 13% of electricity. d) Efficient Hydraulic Components The patented 3D impeller design keeps each high-pressure impeller at equally high levels of efficiency. Figure 3 below shows the performance comparison of traditional water conservancy components and 3D high-efficiency water conservancy components. As can be seen from FIG. 3, the pump efficiency with 3D high-efficiency water conservancy components can be increased by as much as 10% or more. e) Maintenance Convenience The coupling protection device designed according to EN 2006/42 / CE is shown in Figure 4. The unique coupling Spacer is designed as shown in Figure 5, and the cartridge mechanical seal can be configured as shown in Figure 6. All of the above designs guarantee the shortest maintenance time. f) The system is safe and reliable System through the semiconductor digital chip contactless switch to start and stop the pump, do not need the relay circuit, reducing the frequent contacts in the relay circuit disconnect, reduce the incidence of failure to provide system security, reliability. g) Noise low frequency noise reduction technology, can greatly reduce the degradation of frequency conversion current sound. Than the average frequency noise reduction technology 10-20dB. Frequency conversion output self-sustaining technology to minimize the control cabinet components action sound. h) stainless steel pumps, piping, valves and accessories use food-grade stainless steel to ensure clean water. i) The energy consumption of the control system is less. The special inverter for pumps that integrates the inverter and the controller will no longer need a bulky control cabinet (as shown in FIG. 7 and FIG. 8), reducing the need for components and electrical control systems The heat generated by the circuit itself consumes about 3 to 5% of the energy consumed by the pump. 3. System Functions a) Constant Pressure Control Function: Maintains the stability of water supply pressure and automatically adjusts the pumps according to the changes of water consumption. The pumps work in the condition of frequency conversion and power frequency, and follow the principle of "first-come first-first". b) Failure pump operation beyond the function: the use of CAN communication pump failure, the system can automatically start the next normal pump operation. c) The average efficiency of the function of sharing: Each pump frequency conversion operation of the same efficiency, this feature can be overcome due to the minimum motor start-up frequency control constraints caused by the waste of energy. d) Energy-saving: The system adopts advanced high-efficiency integrated variable frequency control technology. Compared with the traditional PLC frequency conversion control technology, the system saves about 13% of the average energy. e) Protection function: The pump group adopts the operation mode of "first start first" to circulate, regardless of the main and backup pumps, all the pumps operate evenly to avoid the corrosion damage caused by the standby pump not starting for a long time, and low water consumption at night The peak voltage regulator is used to stabilize the low-voltage operation. This will not only extend the service life of the pump set, but also reduce the pump maintenance costs. f) Automatic timing switching function: the control system has a timer to record the cumulative working time of each pump. When the accumulated working time of a pump reaches the set value, the control system will interrupt the operation of the pump according to the data comparison The pump automatically into standby and re-timing, step down pump automatically switch to run, followed by the cycle, to achieve the purpose of switching time. g) Automatic shutdown without water function: automatic shutdown protection and alarm when no water, can start automatically when there is water. h) small flow stop pump dwell: the system in low water, can automatically switch to small flow automatically stop pump dwell state. i) Instantaneous power failure self-recovery function: instantaneous power failure due to power grid changes, the call automatically resume operation. IV Conclusion In China with the rapid development of urbanization, urban tap water demand will also continue to increase, all kinds of secondary booster variable frequency constant pressure water supply equipment with the booming urbanization process, and constant pressure water supply equipment is Achieve the second part of the reliable operation of pressurized equipment. In China, a series of frequency conversion control technology based on integrated technology has been welcomed by the majority of users due to its characteristics of safety and reliability, low energy consumption, powerful functions, high intelligence and convenient operation and maintenance. It can be applied to energy-saving retrofits including old secondary water supply pump rooms, secondary pressurized water supply for new projects, and circulating water supply systems for air conditioners, HVAC, industrial and domestic water supply, especially as global warming and energy deficiencies , The country can continue to develop the strategic needs, energy-saving emission reduction task more urgent, it is foreseeable, the use of high efficiency and integrated variable frequency control technology of constant pressure water supply equipment needs and applications will be more and more. (Editor: Xiaoxia QQ:) Recommended reading: 2017 exhibition information
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