How to choose diesel engine water pump?
When the user chooses the diesel water pump, it is best to go to the sales point approved by the agricultural machinery department and be sure to recognize the manufacturer. It is recommended to give priority to the purchase of water-filled submersible pumps and to see the brand and product quality certificate. Never buy a “three no” (ie no manufacturer, no production date, no production license) products, otherwise, there will be problems, users will be helpless.
As a user, due to the limitations of professional knowledge, it is difficult to determine. The best way is to consult the experts in the diesel water pump. It is also advisable to consult some old diesel pump users, especially those who are close to their own conditions and buy these users. Trustworthy, reliable and mature products are a wise choice. At the same time, the single-phase or three-phase pump should be used according to the local power supply.
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Select the diesel water pump that meets the head requirements
The so-called head refers to the required lift, not the height of the lift, which is particularly important for the selection of diesel pumps. The lift of the diesel engine pump is about 1.15 to 1.20 times the height of the lifting water. If the vertical height of a water source to the water is 20 meters, the required lift is about 23 to 24 meters.
When selecting a diesel engine pump, the head on the nameplate of the diesel engine should be close to the required head, and the general deviation should not exceed 20%. In this case, the diesel pump has the highest efficiency and is more energy-efficient, and is more economical. If the lift on the nameplate is much smaller than the required lift, the diesel pump often cannot meet the needs of the user. Even if the water can be pumped, the water volume is small. But conversely, when the high-lift diesel water pump is used for low lift, there will be excessive flow, which will cause the motor to be overloaded. If the motor temperature rises for a long time, the winding insulation will gradually age and even burn the motor.
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Select the diesel pump with the right flow rate
The flow rate of the diesel engine water pump, that is, the water output, should not be selected too much, otherwise, it will increase the cost of purchasing the diesel water pump. It should be selected as needed. For example, the self-priming diesel water pump used by the user’s home should be selected as small as possible; for example, the submersible diesel water pump for user irrigation can choose a larger flow.
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The key to the purchase of the agricultural diesel water pump
1) It is necessary to purchase diesel water pumps according to local conditions. There are three types of commonly used agricultural diesel water pumps, namely centrifugal pumps, axial pumps, and mixed flow pumps. The centrifugal pump has a high lift, but the water output is not large, and it is suitable for mountainous areas and well irrigation areas. The axial flow pump has a large water output, but the lift is not too high, and it is suitable for use in plain areas; the water output and head of the mixed flow pump are between the centrifugal pumps. Between the axial flow pump and the axial flow pump, it is suitable for use in plains and hills. Users should purchase according to local conditions, water source, and water lifting height.
2) The diesel engine water pump should be properly selected. After determining the type of diesel pump, it is necessary to consider its economic performance, paying particular attention to the choice of the head and flow of the diesel pump and its supporting power. It must be noted that the head (total head) indicated on the diesel pump’s sign is different from the water head (actual head) when it is used. This is because there is a certain resistance loss when the water flows through the water pipe and the pipeline. Therefore, the actual lift is generally 10%-20% lower than the total lift, and the amount of water is also reduced accordingly. Therefore, in actual use, it can only be estimated from 80% to 90% of the head and flow rate of the signage. The selection of the power of the diesel engine pump can be selected according to the power indicated on the label. In order to make the diesel pump start quickly and safely, The power of the power machine can also be slightly larger than the power required by the diesel engine pump. Generally, it is about 10% higher. If there is power, when purchasing a diesel water pump, the diesel engine water pump can be purchased according to the power of the power machine.
3) It is necessary to strictly purchase diesel water pumps. When purchasing, it is necessary to verify the “three certificates”, that is, the agricultural machinery promotion license, production license and product inspection certificate. Only the three certificates are complete to avoid the purchase of obsolete products and inferior products.