Pumps - only the most suitable and not the best
Pumps - only the most suitable and not the best
A water pump is a machine that transports liquids or pressurize liquids.It transmits the mechanical energy or other external energy transmitted to the liquid, causes the liquid energy increase, mainly used for conveying liquid, including water, oil, the sour lye, the emulsion, hangs the emulsion and the liquid metal, etc.
Liquid, gas mixture and liquid containing suspended solids can also be transported.The technical parameters of pump performance are flow, suction, lift, shaft power, water power, efficiency, etc.According to different working principle can be divided into volume water pump, vane pump type.The volumetric pump USES the change of its studio volume to transmit energy.Vane pump is used to transfer energy through the interaction of rotary blade and water, with centrifugal pump, axial flow pump and mixed flow pump.
When we buy pumps can choose according to the water pump uses, according to the size of the transmission medium particle diameter of classification can be divided into slurry, sewage, water without particles, etc., at the same time also pay attention to the transmission medium acidity, different pump is suitable for the different transmission medium, if need to transport medium containing particles according to the size of the particles choice of half open impeller pump or all open impeller pump, such as conveying sewage can choose BK type centrifugal pump, transmission type alkaline substances can choose fang binxing straight association-like stainless steel self-priming pump.
The pump head is about 1.15 ~ 1.20 times the lifting height.If a water source is 20 meters vertical to the water, the required lift is about 23 ~ 24 meters.It is best to be close to the required lift, and the general deviation is not more than 20%. In this case, the water pump is the most efficient and energy efficient, and it will be more economical to use.If the nameplate is far less than the required lift, the pump often fails to meet the needs of the user, even if the water can be pumped up, the amount of water is small.But on the other hand, high lift water pump used for low head, it will be too much traffic, lead to motor overload, if the long run, the motor temperature, winding insulation will gradually aging, and even burning motor.
The flow of the pump, namely the amount of water, should not be chosen too large, otherwise will increase the cost of buying water pump.Should be chosen according to need, such as the self-priming water pump that the user family USES, the flow should try to choose a smaller number;If the submersible pump used for irrigation, the flow rate can be selected appropriately.