Liuzhou Automatic Frequency constant pressure water supply equipment, Liuzhou fully automatic constant pressure water supply equipment manufacturers, reputation, innovative design, high energy efficiency, low price, your first choice. . Handwashing day from the basin in the past; dinner, day in the past from the bowl; Taking stock silently, begins before the gaze as in the past; evening, I lay in bed, his fixed gaze from me cross over, fly away from my feet. And so I opened my eyes and the sun again, that this has gone one day. I over her sigh. But the shadow of the new day the children began sigh flashed. - "Hurry" "Zhu Ziqing anthology" Liuzhou fully automatic constant pressure water supply equipment structure and principle: the traditional fixed speed pumps with variable speed pump heating, air-conditioning system, run separate quality regulation circulating pump, pump selection The principle is the pump flow rate can not be less than the desired flow of the external network, typically 1.1 to 1.2 times in accordance with the theoretical flow rate of the external network, the head by 1.05 to 1.10 times the total resistance of pipeline and the user selected, then the corresponding shaft power is greater than 100%. Seen by the constant flow of running water pump power consumption to run great. And bring the regulation of the effect is not very satisfactory. Pumps by the constant flow mode of operation, shown in Figure 1: When the under part load conditions, the system is required flow reduction by reducing the adjustment of the degree of valve opening, to adapt to changes in the flow, the need to change the system characteristic curve, i.e. consumption of excess pressure head, wasting a lot of power! In addition by changing the valve opening degree of completion of the adjustment of the pump operating point, we can also change the pump speed: can be seen: the performance curve of the pump when the pump speed changes while changing the speed will vary with frequency [Hz ] changed. Circulating pump performance analysis shows that: pump flow, head and shaft power with a certain proportion of the relationship between the pump impeller speed: as a result it can be seen, the pump head and motor speed is proportional to the square of the pump shaft power is proportional to the cube of the motor speed. That when the pump flow rate is reduced by 20%, the motor speed should be reduced by 20%, the power consumption of the pump will be reduced by 50%; when the pump flow rate is reduced by 50%, a 50% reduction in the speed of the motor and pump power consumption reduced by 87.5%. When the required flow of the system is reduced, by reducing the speed, corresponding to the pump flow is reduced, the shaft of the pump power is reduced significantly the effect of saving energy. As a result of the variable-speed control, and also to avoid unnecessary when using valve regulating valve pressure head loss. II: The principle of the speed control when the flow is reduced, the controller will detect the pressure signal (through the sensor or the state of the motor current or speed). At this point, the controller will Inverter issue a signal to reduce the output (the lower frequencies) until the pressure back to the required level (set point). Conversely, when the flow is increased again, the controller will detect the pressure in the lower. Controller will inverter sends a signal to raise the output (higher frequency) until the pressure is back to the required level (set point). : The overall efficiency of the variable speed pump usually the people referred pump efficiency, pump efficiency only [hp] strict sense, we should measure the total efficiency: overall efficiency [ht] assessment taking into account the motor efficiency [hm] pump efficiency [hp] and conversion efficiency [hd]. The overall efficiency refers to the change from P1 to P4. Motor efficiency and the Motor load of different motor efficiency rating (EFF1 or EFF2). What is the motor efficiency rating? The U.S. Congress in October 1997 to develop and implement the Energy Policy Act (EPACT), the bill defined high efficiency motor. Similarly, the European Union also has a similar definition, motor and power electronics makers Association (CEMEP) 1.1-90KW, 2-pole and 4-pole range efficiency motors developed a definition of minimum requirements. Now CEMEP and EPACT are 50Hz and 60HZ world recognized standard efficiency motors. According to the CEMEP standard, the efficiency of the motor is divided into three levels: EFF1-highest efficiency rating; EFF2-medium efficiency rating; EFF3-inefficient level. The Grundfos pump production EFF1 (the CEMEP standard motor) can be configured. Eff1 motor What are the advantages? Efficient energy efficient Automatic Frequency constant pressure water supply equipment can automatically detect the user's actual water consumption and the use of pressure, adjust the speed of the motor (power consumption), always in the state of high-efficiency equipment. 2, the pressure of the water supply pipe network stability automatic constant pressure water supply equipment consists of a microcomputer automatic closed-loop control, can change the pressure back to normal within 0.5 seconds, the pressure regulator setting ± 5% accuracy. 3 small footprint, low investment, short installation period. Automatic frequency conversion constant pressure water supply equipment and other old-fashioned water supply equipment compared to the conservation area of ??3 to 16 times more than the savings to invest 15% to 60% of the construction of the water tower. The devices are small, easy assembly, installation and commissioning, transportation and installation of a short duration. 4, the protection of a full-featured, safe and reliable operation, easy to operate fully automatic constant pressure water supply equipment host adopts imported frequency converter itself has undervoltage, overvoltage, overcurrent, overload, short circuit, overheating, stall prevention protection function trouble-free use of up to 100,000 hours or more. Part of the equipment and distribution control, intelligent control principle practical, easy to operate, the device working conditions at a glance, easy to non-professionals quickly master. 5, water supply, full-featured, high insurance factor partial failure of the water supply equipment, to enable emergency functions continue water supply Automatic Frequency. Benign state device with the municipal water supply network and network operation, and has dual voltage function that is able to meet the normal water pressure and flow of life and production in the event of a fire is automatically converted to a high-pressure flow of water can be a machine The multi-purpose. Scope Automatic Frequency constant pressure water supply equipment water pressure 0.15 ~ 2.0MP, height of 10-200 meters of water supply, the single set of equipment per hour water supply 10 ~ 50000m3 / h, can be used in small supporting the transformation of the tap water; can be used in enterprises, residential, rural production and living, office water. Relative to ordinary motor, universities means that for the same number of energy, such as, the motor itself less energy loss, and output more. Similarly, because the motor itself energy loss is less, under the conditions of the energy required for the same workload, the energy input by the motor will be reduced, thereby saving energy consumption and operating costs. Figure 7, when the load is low (less than 25%), the mean efficiency will be a sharp decrease. But this time Eff1 motor efficiency significantly than Eff2 motor. The higher part load efficiency most motors are rarely at 100% of full load condition. Thus, in the case of a non-full load, the nominal efficiency of the motor is much, it is very important. For ordinary motors, generally do not provide this data, but EFF1 efficiency of the motor must be in the 75% load and 100% load efficiency. EFF1 motors, these two efficiency value is typically the same. Motor working temperature is low because Grundfos EFF1 motor efficiency, the heat generated by the energy loss is very small, so the temperature of the motor when the work than ordinary motor temperature low. Thereby, efficient motor will be able to work at higher ambient temperature, the required environment cooling requirements than the commonly used standard low motor. Equally affected by temperature, the resistance of the motor stator windings can be maintained in the normal range, Grundfos EFF1 Motor rarely appears the overheating of the motor stator windings. In this way, the service life of the motor stator winding insulation and motor bearings will increase. Low noise usually the case, the motor noise is mainly generated by the cooling fan. EFF1 motors, because the efficiency is higher, the less the heat generated by the energy loss of cooling air required for reducing the motor temperature rise less. So the most amount EFF1 motor cooling fan are small, and thus generate the noise will be reduced. Reduce operating costs EFF1 motor can save energy, reduce maintenance costs and other operating costs, greatly reducing the cost of ownership. In this regard, EFF1 motor price is very competitive. Fact, under normal working conditions, the increase of the initial purchase cost of the full recovery time of less than 3 years. The conversion efficiency to be considered in the calculation of the conversion efficiency of the motor load factor and frequency output. However, when the load is reduced to 30%, the efficiency change will be great. Pump efficiency pump efficiency varies according to the traffic. The maximum efficiency of the pump varies according to the size of the pump, generally speaking, a large pump will be higher than the efficiency of a small pump. When the change of the speed of the pump, the pump efficiency will be changed simultaneously. If the speed is reduced to less than 20%, the efficiency of the change is very small. Although the total in terms of efficiency of energy consumption is very important, but the control modes Quedui energy consumption have a greater impact. The following figure shows the energy-saving effect of different control mode Liuzhou fully automatic constant pressure water supply equipment aftermarket purchase our water supply equipment customers, if demand will provide technical staff come free installation and technical training; water supply equipment to the customer site within 3 days of the completion of the installation and commissioning. 2, I sold water supply equipment to provide a 12-month warranty period. Warranty period, my company free to deal with non-human factors, and belonging to the device itself quality problems occur under normal conditions of use. 3, I sold products provide the lifelong maintenance services. Long-term to ensure that the equipment spare parts supply at preferential prices, to ensure the supply time for at least 10 years. User equipment malfunction in the operation of the user to issue a repair notice given within two hours of the fax or telephone Reply confirmed by the Division I; For on-site service, arrived at the scene within 24 hours of Hunan Province, outside the province within 72 hours to catch to the scene. 5, to provide customers with the non-confidential information, and give a reply within one working day (8 hours) after receipt of (potential) customers non-fault information. Liuzhou fully automatic constant pressure water supply equipment Features 1, energy efficient automatic constant pressure water supply equipment can be detected automatically according to the user's actual water consumption and the use of pressure, adjust the speed of the motor (power consumption), so that the equipment is always in a high efficiency work status. 2, the pressure of the water supply pipe network stability automatic constant pressure water supply equipment consists of a microcomputer automatic closed-loop control, can change the pressure back to normal within 0.5 seconds, the pressure regulator setting ± 5% accuracy. 3 small footprint, low investment, short installation period. Automatic frequency conversion constant pressure water supply equipment and other old-fashioned water supply equipment compared to the conservation area of ??3 to 16 times more than the savings to invest 15% to 60% of the construction of the water tower. The devices are small, easy assembly, installation and commissioning, transportation and installation of a short duration. 4, the protection of a full-featured, safe and reliable operation, easy to operate fully automatic constant pressure water supply equipment host adopts imported frequency converter itself has undervoltage, overvoltage, overcurrent, overload, short circuit, overheating, stall prevention protection function trouble-free use of up to 100,000 hours or more. Part of the equipment and distribution control, intelligent control principle practical, easy to operate, the device working conditions at a glance, easy to non-professionals quickly master. 5, water supply, full-featured, high insurance factor partial failure of the water supply equipment, to enable emergency functions continue water supply Automatic Frequency. Benign state device with the municipal water supply network and network operation, and has dual voltage function that is able to meet the normal water pressure and flow of life and production in the event of a fire is automatically converted to a high-pressure flow of water can be a machine The multi-purpose. Scope Automatic Frequency constant pressure water supply equipment water pressure 0.15 ~ 2.0MP, height of 10-200 meters of water supply, the single set of equipment per hour water supply 10 ~ 50000m3 / h, can be used in small supporting the transformation of the tap water; can be used in enterprises, residential, rural production and living, office water.