Users choose the pump, it is best to the agricultural machinery department approved point of sale, we must recognize that the manufacturer. It is recommended to give priority to the purchase of water-filled submersible pump, and see the grades and product quality certification. Do not buy "three no" (that is, no manufacturer, no production date, no production license) products, otherwise there is a problem, the user will do nothing. As a user, due to the limitations of professional knowledge, it is difficult to decide, the best way is to consult the pump experts, may wish to consult some of the older pump users, especially those who are close to their own conditions, to buy these users trust, Reliable quality and more mature products, after all, a wise choice. At the same time, should be based on the local power supply situation to decide with single-phase pump or three-phase pump. 2. Choose to meet the lift requirements of the pump The so-called head lift is the required lift, not the height of the lift, a clear choice of pump is particularly important. Pump lift about 1.15 to 1.20 times the height of the lift. If a water source to the water vertical height of 20 meters, its required lift is about 23 to 24 meters. The pump should be selected on the pump nameplate lift the best and the desired head close to the general deviation of not more than 20%, in such cases, the highest efficiency of the pump, but also more energy-efficient, the use of more economical. If the nameplate lift is far less than the required head, the pump often can not meet the needs of users, even if the pumping water, the water is also small pitiful. However, when the pump with high head is used for low lift, the flow will be too large, causing the motor to over load. If the motor is running for a long time and the motor temperature rises, the winding insulation will gradually age and even burn the motor. 3. Select the appropriate flow pump Pump flow, that is, the amount of water generally should not choose too large, otherwise it will increase the cost of purchasing a pump. Should be selected according to need, such as self-suction pumps used by the user's home, the flow should be selected as small as possible; such as user irrigation submersible pumps, you can choose the appropriate flow larger. 4. Agricultural water pump key to the purchase 1) According to local conditions to buy water pump. Commonly used agricultural pumps have three types, namely centrifugal pumps, axial pumps and Francis pumps. Centrifugal pump higher head, but the water is not large, suitable for mountain and well irrigation area; axial pump large amount of water, but the lift is not too high, suitable for use in plain areas; Francis pump water and head lift between the centrifugal pump And axial flow pump, suitable for plain and hilly areas. Users should according to the local conditions, water and water to buy height. 2) to be properly exceeded the election pump. After determining the type of pump, to consider its economic performance, with particular attention to the pump head and flow and the choice of supporting power. It must be noted that there is a difference between the head (total head) indicated on the pump label and the head of water (actual head) when it is used, as there is a certain loss of resistance when the water flows through the pipe and the pipe. Therefore, the actual head is generally 10% -20% lower than the total head, the amount of water is also reduced accordingly. Therefore, the actual use, only by the signs of the head and flow rate of 80% to 90% estimated that the pump supporting the power of choice, according to the signs indicated on the power of choice, in order to make the pump start quickly and use safety, power machine Power can be slightly larger than the pump power required, generally higher than about 10% is appropriate; if there is power, when purchasing a pump, you can press the power of the power machine to buy matching pump. 3) To strictly purchase water pump. When the purchase to test the "three cards", that is, agricultural machinery to promote permits, production licenses and product inspection certificate, only three cards all can avoid the purchase of obsolete products and inferior products.
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Pump selection method
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