Application of the hottest variable frequency spee

Application of variable frequency speed regulation constant pressure water supply system

Abstract:

high efficiency and energy saving. Set the water supply pressure as required, and adjust the pump speed by frequency conversion according to the water consumption of the pipe, so that the pump can always operate under high-efficiency conditions. Compared with ordinary tower less water supply equipment, the energy-saving effect is up to 20%

keyword: energy saving, environmental protection Before the equipment is put into operation, the working pressure and other relevant operating parameters of the equipment should be set first. When the equipment is running, the pressure sensor will continuously collect the water pressure and water pressure change rate signals in the water supply pipe, convert them into electrical signals and transmit them to the frequency conversion control system. The control system will compare and calculate the feedback signal with the set pressure, If the actual pressure is lower than the set pressure, the command will be issued to control the water pump to speed up. If the actual pressure is higher than the set pressure, the water pump will be controlled to slow down. When the set pressure is reached, the water pump will maintain the operation frequency. If the frequency conversion water pump reaches the rated speed (frequency), after a certain period of judgment, if the pipe pressure is still lower than the set pressure, the control system will switch the water pump to power frequency operation, and start the next water pump with frequency conversion until the pipe pressure reaches the set pressure; On the contrary, if the water consumption of the system decreases, the system will command the water pump to slow down. When it decreases to the effective speed of the water pump, the water pump that is first started in the running water pump will stop running, that is, reduce the number of running water pumps until the pipe pressure is constant within the set pressure range. The main pump stops working, and the water supply of the auxiliary pump is also in the mode of frequency conversion and constant pressure water supply, which further improves the work efficiency and saves energy

system composition

system characteristics

high efficiency and energy saving. Set the water supply pressure as required, and adjust the pump speed by frequency conversion according to the water consumption of the pipe, so that the pump can always operate under high-efficiency conditions. Compared with ordinary tower less water supply equipment, the energy-saving effect is up to 20%

small impact on electricity and perfect protection function. It eliminates the impact and interference to the electricity when the pump motor is directly started, and the equipment control system has a variety of protection functions such as short circuit, overcurrent, overvoltage, overload, undervoltage, overheating, which greatly improves the work efficiency and extends the service life of the pump

human machine interface touch panel operation, flexible and convenient parameter setting. It can flexibly set various working parameters such as lower frequency limit, acceleration time, deceleration time, pump replacement time, etc., and can display the system operation time and check various fault causes

timed wake-up function. Since the system determines the number of pumps put into operation according to the water consumption of the pipe, when the water consumption changes in a small range for a long time, one pump will be seriously worn out due to long-term operation, while other pumps will not be used for a long time, causing rust. This problem can be easily solved after setting this function. For multiple water pumps with the same flow, use their own stored energy to tear the sample; The energy consumed when tearing the sample is calculated by the computer control system. In order to make the average working time of each pump the same, the function of changing the pump regularly must be set. After the timing is set and the pump change function is based on the success of this research, when the semi steel radial tire with carbon nanotubes can achieve low rotational resistance, and the continuous working time of a variable displacement pump exceeds the set value, and there is a variable displacement pump in the "rest" state, the frequency converter will automatically switch to start the variable displacement pump with the longest "rest" time, and stop the original variable displacement pump, so as to ensure that the running time of each pump is equal and prolong the service life of the pump. The pump replacement time can be set arbitrarily

when the frequency converter fails, it can automatically switch to power frequency operation to ensure uninterrupted water supply. If you call again after a sudden power failure, the equipment can start running automatically

scope of application

it is widely used in residential areas, hotels and other public buildings, and has published the LCA (life cycle assessment) energy consumption verification results water, boiler make-up water, booster pump stations, production water, fire water, boiler constant pressure make-up water, oil pipeline pressurization, water injection system, farmland irrigation, etc