When the constant speed pump installed in a certain pipeline work, the actual state of work depends not only on the performance curve of the pump itself, but also depends on the characteristics of the entire pipeline. The intersection of these two curves determines the operating conditions of the pump in the piping system. In the same piping system characteristics of the system, for different pumps, the operating point is different. Constant speed pump and speed pump work point there is a big difference, so that flow, lift, different efficiency. Constant speed feed water pump in the water supply system is generally centrifugal, its working principle is the use of centrifugal force generated by the rotation of the fluid to obtain energy. It is driven by a certain power motor to a certain speed of rotation, the fluid to be a certain pressure and kinetic energy. Speed ​​feed pump (YT62 type fluid coupling, for example) has a special piece - hydraulic coupling. It is installed in the prime mover (motor, etc.) and the feed pump between the rotation of the liquid kinetic energy to transmit power hydraulic transmission. Its working principle is: there is a pump impeller at the end of the drive shaft, the driven shaft on the opposite end of the drive shaft with a turbine, impeller and turbine to maintain a certain gap between the two form a cavity, said For the round circle. When the prime mover drives the drive shaft to rotate, the working fluid gains energy in the pump wheel and is thrown from the pump wheel at a certain speed toward the turbine to transfer the energy to the turbine, so as to drive the driven shaft to rotate and realize the power transmission . Circulation of working oil in the circle The cycle can only be maintained if there is a difference in centrifugal force between the impeller and the turbine at different speeds (slip). Under rated operating conditions, the slip ≤3%, as long as the change in the oil circulating in the circle, that is, to change the oil filling, you can adjust the speed of the driven shaft and transmission power to achieve stepless speed regulation.
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