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一、问题的提出江苏省水泵生产厂有测试设备(包括简易设备)的不到二十家,仅占总数的20%。有测试设备的工厂,也只是在说明书上给出额定转速下的水泵性能曲线,或几个工作点的参数,不能满足用户使用需要。另一方面,因水泵缺档而造成用户选用的水泵扬程偏高,许多老站的高扬程水泵,低扬程使用,抽水装置效率低。为了提高水泵效率,在泵改时多采用降速的办法,即用比例律计算出应该降低的转速。 n=n_2((H_(净i)+SQ_i~2)/(H_o))~(1/2)式中:下角标“0”表示水泵在额定转速最高效率下的工作点参数。下角标“(?)”表示水泵在实际使用的工作点参数。见图1。用比例律计算出的等效率曲线上的效率,其实不是等效率,当转速变化大时,误差也大。因此测出泵在使用工况下各性能参数的定量值是很必要的。本文介绍的用户水泵测试装置,是一种较为可靠方便的测试手段。
First, the problem raised Jiangsu Province, pump production plant has less than twenty test equipment (including simple equipment), accounting for only 20% of the total. There are test equipment factory, only the manual gives the rated speed of the pump performance curve, or a few operating parameters, can not meet the needs of users. On the other hand, due to lack of pumps caused by the user selected high lift pump, many of the old station high-lift pump, low head use, pumping low efficiency. In order to improve the efficiency of the pump, the pump is often used to reduce the speed of the way, that is calculated using the law of proportion should reduce the speed. n = n_2 (H_ (net i) + SQ_i ~ 2) / (H_o)) ~ (1/2) Where: The subscript “0 ” said the pump at the rated speed of the maximum efficiency of the operating point parameters. The subscript “(?) ” Indicates the actual operating point of the pump parameters. see picture 1. Equivalent efficiency calculated by the proportional law curve efficiency, in fact, is not equivalent, when the speed changes, the error is large. Therefore, it is necessary to measure the quantitative value of the performance parameters of the pump under the operating conditions. This article describes the user pump test device, is a more reliable and convenient test method.