A head measuring device and method for a micro-lift vertical axial flow pump

Abstract

The invention relates to a measurement device and a measurement method for the lift of a micro-lift vertical axial-flow pump. The measurement device comprises the axial-flow pump and a water tank, wherein a first pressure sensor, a first valve, an auxiliary pump and a second valve are arranged on a pipeline between the pump outlet of the axial-flow pump and the water tank; a flow meter is further arranged on the pipeline between the pump outlet of the axial-flow pump and the water tank; and a second pressure sensor and a third pressure sensor are arranged at the inlet and the outlet of the auxiliary pump respectively. According to the device, the auxiliary pump is additionally arranged in a pipeline system of the axial-flow pump, so that the resistance of the pipeline system during a test is effectively overcome, and then a solid test device platform is provided for accurate measurement for the lift of the micro-lift pump and the characteristic curve of the pipeline. The measurement device disclosed by the invention is capable of effectively reducing a measurement error and improving the accuracy of a measurement result in the case of being used for measuring the micro-lift of the vertical axial-flow pump.

Description

technical field [0001] The invention belongs to the technical field of lift measurement of axial flow pumps, and in particular relates to a lift measurement device and a measurement method of a micro-lift vertical axial flow pump. Background technique [0002] After the liquid obtains energy through the pump device, it is discharged along the outlet pipeline. Due to the resistance characteristics of the pipeline itself, when the pump device discharges liquid with different flow rates, it needs to overcome different resistance along the way. Specifically, for a pipeline with a certain structure, the greater the flow rate, the greater the resistance loss along the pipeline, and vice versa. The existing head test device is aimed at the pump device with a head of more than several meters. It directly measures the inlet and outlet pressure of the pump device to calculate the corresponding head under a certain flow rate. The impact is very small, and the loss along the pipeline i...

AI Technical Summary

Problems solved by technology

The existing head test device is aimed at the pump device with a head of more than several meters. It directly measures the inlet and outlet pressure of the pump device to calculate the corresponding head under a certain flow rate. The impact is very small, the loss along the pipeline is negligible relative to the pump head, and there is no need to consider the problem of overcoming pipe resistance during the operation of the pump device

However, during the operation of the micro-lift pump, due to the low head of the pump itself, it is difficult to overcome the resistance along the pipeline, especially when the pipeline resistance increases significantly under the condition of large flow, the measurement error of the head will be greater, and even may occur The case where the micro-lift pump cannot work

Therefore, when measuring the head of the micro-lift pump, the influence of pipe resistance on the head measurement cannot be ignored

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