目前,我国采用的砂石泵多按理想流体设计,效率低,气蚀性能差,真空吸上高度难以保证。例如,在国内系列产品中,真空吸上高度不超过7.0米水柱高,而且流道较窄,只能间断通过30～50毫米的固体颗粒,因此高吸程、大流道的砂石泵仍属空白。 At present, the sand pump used in our country is designed by the ideal fluid, which has low efficiency, poor cavitation performance and high vacuum suction height. For example, in the domestic series of products, vacuum suction to a height of not more than 7.0 meters high water column, and the narrow flow path can only intermittently through 30 to 50 mm of solid particles, the high suction, large flow of sand pump is still Is blank.