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自从８０年代末期以来，大量各种品牌的国外变频器进入国内市场。变频器的出现为水泵变频无级调速提供了技术与物质基础。变频器外加变频控制器可以实现恒压变量或变压变量（通常多采用准变压变量）供水控制。所谓准变压变量供水控制是指供水压力随供水流量增加而跃阶上升...
Since the late 1980s, a large number of foreign inverters of various brands have entered the domestic market. The appearance of the frequency converter provides the technical and material basis for the frequency conversion stepless speed regulation of the water pump. Inverter plus variable frequency controller can achieve constant pressure variable or variable pressure variable (usually more quasi-variable pressure variable) water supply control. The so-called quasi-variable pressure variable water supply control means that the water supply pressure rises with the increase of the water supply flow...