一、自动供水装置技术现状和特点　　目前，在微喷灌供水系统中使用的压力罐自动供水装置，其采用的泵型一般为自吸离心泵、深井泵和潜水泵等。自吸离心泵其特点是结构紧凑，操作简单，但制造工艺复杂，自吸时间长，效率较低，运行费用较高；深井泵和潜水泵虽然具有一定的扬程 First, the automatic water supply device technology status and characteristics At present, the micro-sprinkler irrigation system used in automatic pressure water tank device, which uses the pump type is generally self-priming centrifugal pumps, deep well pumps and submersible pumps. Self-priming centrifugal pump is characterized by compact structure, simple operation, but the manufacturing process is complex, long self-priming, low efficiency, high operating costs; deep well pump and submersible pump although has a certain head