Frequency constant pressure water supply control cabinet can not pressure switch
Through the above analysis can be concluded: electrical contact pressure gauge can not achieve a true closed-loop constant pressure water supply. Only through the control circuit through the water pump in the set pressure limit and the upper limit between the repeated start to stop the water supply, while the pipe network pressure in the set upper limit pressure between the lower limit. Electric contact pressure gauge control damage: repeated start and stop the inverter pump water supply system instability, the equipment wear is relatively large, can not achieve constant pressure water supply energy saving effect.
First understand the principle of the next two control methods Frequency constant pressure water supply principle: to pipe network water pressure (or user water flow) for the set parameters, by controlling the output frequency of the inverter to automatically adjust the pump motor speed, (PID), so that the water supply system automatically maintained at the set pressure value; that is, when the water increases, the frequency increases, the pump speed, water supply increased; water consumption decreases, the frequency decreases, the pump speed Slow down, the corresponding reduction in water supply, thus ensuring the water supply efficiency of water pressure and water users, while achieving the purpose of improving water quality and water supply efficiency.
Electric contact pressure gauge works: electrical contact pressure gauge by the measurement system, indicating system, magnetic auxiliary contact device, shell, adjust the device and the junction box (plug seat) and other components. The spring tube in the measuring system under the pressure of the measured medium, so that the end of the spring tube to produce a corresponding elastic deformation of a displacement, with the lever by the gear drive transmission and to enlarge, by the fixed gear on the instructions (together with the contact ) Will be measured by the value of the dial on the instructions. At the same time, when it is in contact with the contact (upper or lower limit) on the set pointer (moving or moving), the circuit in the control system is disconnected or turned on to achieve automatic control and The purpose of the alarm.
