A kind of energy saving rate estimation of centrifugal pump frequency conversion transformation and its frequency conversion setting method

Abstract

The invention discloses a power saving rate estimating and frequency conversion setting method for frequency conversion reconstruction of a centrifugal pump. The power saving rate estimating method comprises the steps of collecting flow rate and historical motor current data, grouping and counting data, counting motor current weighted mean after different power frequency reference flow rate running points are reconstructed into frequency conversion points, comparing the minimum values, and estimating the maximum power saving rate. The frequency conversion setting method comprises the steps ofdetermining the outlet valve opening degree corresponding to the power frequency running condition based on the power frequency reference flow rate running points corresponding to the maximum power saving rate scheme, keeping the outlet valve opening degree all the time, switching to a frequency conversion running condition, and adjusting the rotating speed of the centrifugal pump in order to meetthe dynamic flow rate demand change. According to the methods, the maximum power saving rate of the centrifugal pump can be accurately counted after the original power frequency running condition isreconstructed into the frequency conversion running condition based on the power frequency running data of the centrifugal pump with limited types, and the corresponding frequency conversion setting method is supplied, so that the purpose of saving power of the centrifugal pump in running is achieved to the maximum.

Description

technical field [0001] The invention belongs to the technical field of energy saving of centrifugal pumps, and in particular relates to a method for estimating the power-saving rate of centrifugal pump frequency conversion transformation and its frequency conversion setting method. Background technique [0002] Centrifugal pump is the most widely used pump equipment, which plays a role in liquid transportation in various occasions of industrial and agricultural production and residents' life, and consumes a lot of energy. In most applications, the flow of liquid delivered by a centrifugal pump is not constant, but varies dynamically with the demand at the water end. For a centrifugal pump operating at a constant speed and power frequency, it is necessary to adjust the opening of the valve at the outlet end of the centrifugal pump to change the resistance of the pipeline to regulate the flow. However, this method causes additional waste of energy due to valve resistance on th...

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Problems solved by technology

[0004] One of the objectives of the present invention is to provide a method for estimating the power saving rate of centrifugal pump frequency conversion transformation, so as to solve the problem that the existing centrifugal pump frequency conversion energy saving transformation technology relies too much on the pump performance curve and pipeline resistance curve information as well as the technology and experience of professional technicians , and not objective and accurate technical issues

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