日韩精品 欧美_欧美激情视频给我_久久这里有精品_蜜桃传媒视频第一区入口在线看

application

In order to give full play to the economic benefits of farmland irrigation and drainage machinery, the site of the irrigation and drainage station should be reasonably selected according to topography and hydrological conditions, the canal system and pipelines should be reasonably configured, and the pump type, number of pumps and the corresponding lift, flow and other parameters should be correctly selected . The selection of water pump should be based on the suction lift, head and flow rate in use. According to the basic principle of pumping water, various adjustment methods should be adopted to adapt to the changing requirements, so that the power and the rated power of the pump are matched properly. Well pumps should be based on well depth, well diameter, dynamic water level, water influx and actual working head to select reasonable types and parameters: generally use long shaft deep well pumps and submersible electric pumps for deep wells with high head; shallow wells or working surfaces use centrifugal pumps and screws Pumps and small vane pumps or micro centrifugal pumps, and select appropriate supporting power, can also use low-lift submersible pumps. For sprinkler irrigation, drip irrigation and underground infiltration irrigation equipment, the power, pump and pipeline size and system are reasonably selected according to the required pressure and flow.

Infiltration irrigation equipment

The water source and piping system of the underground infiltration irrigation equipment is similar to that of the drip irrigation equipment, but shallow buried underground seepage tiles or perforated double-walled plastic pipes are used to replace the capillary equipped with drippers, so that the seepage pressure exceeds the soil moisture tension, thereby leaking water into the crop root zone Irrigation (see underground irrigation). After the water seepage capillary is used for a certain number of years, it will be corroded, scattered and mixed into the soil, so it needs to be laid and buried regularly.