How to choose the right pump for micro sprinkler irrigation and drip irrigation?

For the selection of irrigation water pump, the type of water pump should be selected according to the situation of water source, and the head and flow rate of water pump should be considered according to the irrigation area. The above conditions should be determined, and the ideal effect can be achieved by micro spray and drip irrigation. Let's make a specific analysis of this:

Types of 1. water pumps

There are different options for agricultural irrigation pumps in different regions. There are three main types of agricultural pumps to choose from: mixed flow pumps, centrifugal pumps, and submersible pumps. The flow and head of the mixed flow pump is between the centrifugal pump and the axial flow pump. Small shape, light weight, high efficiency, wide effective area, simple structure, convenient use and easy maintenance. The conveying medium is clear water or similar to clear water, which is suitable for irrigation and drainage in areas with abundant surface water sources in the south. Centrifugal pump is the use of impeller rotation and make water centrifugal movement to work. There are many models to choose from, and the range of flow and head options is also large. It is a water pump with a wide range of agricultural applications. Plain area can choose lower lift centrifugal pump, hilly area can choose moderate lift, high altitude area can use high lift multistage centrifugal pump. Users should choose according to the local ground conditions, water sources and water lifting height. Submersible pumps are suitable for pumping water from deep wells and are mainly used for irrigation in plain areas such as North China where surface water is scarce and for irrigation in plateau mountainous areas.

The head of the 2. pump

The so-called head refers to the required pressure, not a single lifting height, which is particularly important for selecting a pump. The pump lift is about 1.15 to 1.20 times the water lifting height. 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 the pump, the lift on the pump nameplate should be close to the required lift. In this case, the efficiency of the pump will be more economical to use. However, it is not necessarily required to be equal. As long as the general deviation does not exceed 20%, the pump can work in a more energy-saving situation.

If you choose a pump with a lift far less than the required lift on the nameplate, you will often not be able to meet the wishes of users. Even if you can pump water, the amount of water will be pitifully small, and even become a useless "idle pump". Whether to buy the pump head the higher the better. High lift pump for low lift, there will be excessive flow, resulting in motor overload, if the long run, motor temperature, winding insulation will gradually aging, and even burn the motor.

(1) low head, with ordinary centrifugal pump. Water with micro-jet head, belt working pressure is generally below 10 meters, 20 meters, plus the pipeline loss, pump head is 15-25 meters. Ordinary micro sprinkler irrigation or drip irrigation working pressure of about 20 meters, pump head optional 25-40 meters. For small family size (3-10 mu), the mode of "one pump, one tube" is adopted. The motor water pump with power of 1.1-2.2 kW, diameter of 25-40mm and lift of about 15 can be selected. In the absence of power lines, gasoline engine water pump can be used.

(2) moderate lift, with a sprinkler pump. Generally used in field sprinkler irrigation, the irrigation unit is about 50 mu, and the pump head is 45 meters. If the irrigation unit is about 150 mu, the pump head is 55 meters.

(3) High head, multi-stage water pump. Generally applied to mountain sprinkler irrigation, head calculation is also simple, that is, the relative height of the plain lift mountain, such as the mountain height of about 50 meters, the pump lift is about 100 meters. Ordinary centrifugal pump for high lift, low efficiency, it should not be used. When the head is greater than 55 meters, you can choose a multi-stage pump, which is connected in series by a multi-stage impeller, the head can reach more than 200 meters, and the efficiency is the efficiency of a single-stage impeller, will not be reduced.

3. water pump flow

The flow rate of the water pump, that is, the water output, each micro-spray or drip irrigation has a rated flow range, the installation of micro-spray, drip irrigation needs flow, that is, each micro-nozzle or dripper flow multiplied by the expected number of installations is the total flow required. Generally, it is not appropriate to choose too large, otherwise, it will bring problems such as pipe burst to the irrigation system, and it will also increase the cost of purchasing water pumps.

In addition, it should be noted that the flow rate of the water pump should match the specifications of the pipeline.