A major method of multistage centrifugal explosion-proof pump flow control

Multistage centrifugal explosion-proof pump in mine, water conservancy, industry and other industries, they are widely used for its point selection and analysis of energy consumption is increasingly attention. Point, refers to the multistage pump device in the actual water yield of a transient, head, shaft power, efficiency, and on the vacuum suction height, etc. , it said the pump work ability. Usually, multistage centrifugal explosion-proof pump flow rate and pressure head may be inconsistent with the piping system, or because the production task change, technological requirements, need adjustment on multistage pump flow, its essence is to change the working condition of centrifugal pump. In addition to the engineering design stage centrifugal pump selection is correct or not, multistage centrifugal pumps are actually used in the choice of point will directly affect the user's energy consumption and cost. Therefore, how to reasonably change the operation condition of the multistage centrifugal pump is particularly important.

multistage centrifugal explosion-proof pump working principle is to put the motor high speed rotating mechanical energy into kinetic energy and potential energy of liquid was promoted, is a process of energy transfer and conversion. According to this characteristic, the multistage centrifugal pump working point are built on the water water pump and pipeline system, on the balance between energy supply and demand situation change, as long as either of the two will transfer its point. Piping system characteristic curve changes, such as throttle valve; The characteristic curve of pump itself changes, such as frequency control of motor speed, cutting impeller.

multistage centrifugal explosion-proof pump flow control under the main way to analyze and compare:

1) Throttle valve

change centrifugal pump flow the simplest method is to adjust the pump discharge valve opening, and the water pump speed remains the same, Are generally rated speed) , its essence is to change the position of the pipeline characteristic curve to change the point of the pump. Turn down the valve, pipe local resistance increases, the pump point move to the left, the corresponding flow decreases. Valve fitted, equivalent resistance is infinite, flow is zero, the pipeline characteristic curve and the vertical overlap. When turn down the valve to control the flow capacity of the pump itself remains unchanged, lift characteristics unchanged, pipe resistance characteristic will change along with the change of valve opening. This method is simple, continuous flow, can be in one of the maximum flow between zero and adjust at will, and no additional investment, applicable occasions is very wide. But throttling is extra energy consumption by multistage centrifugal pump, to maintain a certain supply, the efficiency of multistage centrifugal pump will be down, the economy is not very reasonable.

        2） Frequency control of motor speed

point deviates from the high efficiency area is the pump need to control the basic conditions. When the water pump speed change, valve opening unchanged ( Usually for the biggest opening) Characteristics, pipeline system unchanged, while water supply capacity and lift characteristics change.

at the required flow rate is less than the rated flow, under the condition of frequency control of motor speed when the head is smaller than the throttle valve, so the water power of the frequency control of motor speed required is smaller than the throttle valve. Obviously, compared with the throttle valve, the energy saving effect of variable frequency speed regulation is very outstanding, multistage centrifugal pump efficiency is higher. In addition, using variable frequency speed regulation, is not only beneficial to reduce the possibility of a multi-stage centrifugal pump cavitation occurred, but also by the acc/dec time to extend the preset starting/stopping process, thus greatly reducing the dynamic torque, thus eliminated very greatly and destructive water hammer effect, greatly extend the life span of the pump and piping system.

in fact, frequency control of motor speed also have limitations, in addition to larger investment and maintenance cost is higher, will cause the loss of efficiency when water pump speed is too high, is beyond the scope pump proportion law, could not have unlimited speed regulation.

        3）

when cutting impeller rotating speed is constant, pressure head and flow of the pump are related to the impeller diameter. For the same type of pump, the characteristic curve of cutting method to change the pump can be used.

cutting law is established on the basis of a large number of testing data, it thinks if the amount of cutting impeller control within limits ( The cutting limit related to pump than revolution) before and after, the cutting efficiency can be treated as the same accordingly. Cutting impeller is a simple way to change the water pump performance, the so-called variable diameter adjustment, to some extent, it solved the pump type and the limitation of specification and the contradiction between the diversity of the object requirements of water supply, enlarge the using range of the multistage pump. Cutting impeller is the irreversible process, of course, the user must go through precise calculation and measure the economic rationality of rear can implement.

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