At present, the main energy-saving pumps in China are the following energy-saving technologies: Cutting impeller, inverter technology, ternary flow technology and dedicated energy-saving pump, below we analyze the characteristics of these energy-saving technologies.
Cutting impeller Energy Saving
As we all know, in the structure of centrifugal pump, determine the size of water and head height of an important component is the impeller. Its working principle is that high-speed rotating impeller to drive its internal liquid rotation, resulting in centrifugal force. We have studied in the physics class of junior high School, one of the important factors determining the size of centrifugal force is the radius of rotation, from this we can see that once a centrifugal pump impeller is cut, that is, the diameter of the impeller smaller, then the impeller's internal liquid centrifugal force will certainly become smaller, its consequences can only be caused by the pump flow, head and other parameters drop, may be safe production.
Energy-saving technology of frequency conversion
The main principle of frequency conversion is to change the frequency of pump-driven motor by frequency conversion, reduce the speed of motor to achieve the effect of energy-saving, its main application range is: ① the load of the motor with the production conditions of the need to present a cyclical change, under such conditions, when the production load is reduced, the load of the motor is also reduced, the use of frequency conversion technology can make the motor at this time to reduce the rotational speed, so as to achieve energy-saving effect, but if in a relatively stable operating conditions of the system, frequency conversion technology energy saving rate will be significantly reduced. ② adapt to some circulating water system because of the design parameters of a larger amount of water pump, that is, the so-called "big horse cart", have certain effect, in this kind of work condition, depend on frequency change pump motor frequency, reduce pump speed, adjust pump q, H value working condition point, make water pump's actual flow value is lower than pump's rated flow value, in order to achieve energy saving purpose.
Centrifugal pump is based on the hydraulic characteristics of the best conditions of the specific speed as a criterion for the design, each pump of the flow of hydraulic model of the geometry must be with its design parameters Q (flow), H (Head), min (rotational speed) one by one corresponding to produce the final efficiency of the pump. Therefore, the pump impeller hydraulic model and geometric dimensions can not change with the speed of the corresponding change, so the frequency conversion speed control to reduce the pump's rated speed, with the pump output flow reduced, pump head lower, the actual efficiency of the pump lower, and far below the original efficiency value of the pump.
When the industrial circulating water system chooses the performance parameter Q and h value of the circulating pump is not very large, if the actual parameter Q and h value of the pump is reduced by using the frequency conversion speed regulation, it may cause the pump flow to decrease too much, the system cooling water quantity is not enough, the water temperature of the cooling
Ternary Flow Technology
Ternary flow technique is the infinite division of three-dimensional space inside the impeller, through the analysis of the working points in the alternate channel, the Complete and real mathematical model of the impeller flow is established.
Through this method, the analysis of the leaf rotation path can be done most accurately, reflecting the flow field and pressure distribution of the fluid is also closest to the actual. Impeller exit is the flow characteristic of jet and wake (Vortex), which can be embodied in design calculation. Therefore, the design of the impeller can better meet the requirements of working conditions, the efficiency significantly improved. However, if the ordinary pump impeller replacement for the three-dimensional impeller, its energy-saving effect may not be expected, because in the pump shell and other components have been stereotyped, a separate three-dimensional flow impeller can not change the entire pump internal flow of all parts of the water resistance and water loss.
Energy-saving Special pump
Special-Purpose water pump dedicated to all types of circulating water system tailored, its comprehensive utilization of various technologies, the siphon principle, ternary flow technology and technical patent perfect combination, and energy-saving water pump from the design, open mold, casting, processing of the whole process control, so that the design of reasonable, open mold in line with the design requirements, and then the use of advanced foundry technology, reduce casting error, finally through careful processing, grinding, so that the final product and design concept to match the best state.
The fluid in the energy-saving special pump internal circulation, can present the relative rule flow state, reduces the import impact, the exit tail trace and so on the loss, greatly avoids the turbulence the appearance, it reduces the impact and outflow of fluid in the design of single channel hydraulic model, and avoids the backflow between the blades, so that the flow of water in the impeller is closer to the design state, the pump flow is improved, the energy consumption is reduced and the pump efficiency is improved. A pump with this technique can reduce the effective shaft force of the pump without any change in the flow rate. and fully meet the industrial system full load operating conditions, will not make the cooling water system temperature rise, with high efficiency, do not change the operating parameters of the system, no impact on the normal production work.
