Abstract
The article presents the results of a study of the wear of individual pump elements, a decrease in their efficiency and significant losses. The nonidentical operation of the extreme and middle pumps was established. The uneven approach of water to the extreme units created reverse flows of water in the suction pipes, work with vibrations of modes close to cavitation. The modernization of the pumps improved the cavitation characteristics due to the elimination of the cavitation center at the impeller inlet in the area of the driven disk, which increased the reliability and durability of the pump. Diagnostics of irrigation pumps made it possible to substantiate proposals for the modernization of their main units and operating modes. The distribution of pumps according to the general level of vibration is shown, indicating the direction at which the maximum value of vibration displacement was recorded and the results of a comparative measurement of the vibration of the units of the pumping station-1 of the Karshi Main Channel (KMC).Studies of the pumps of large irrigation pumping stations have shown a reduction in vibration and an improvement in basic operating parameters. With the participation of the authors, new complex methods of operation are being developed, which allow increasing its reliability by predicting the technical condition.
Highlights
In the XXI century, the systems of pumping water in the Republic of Uzbekistan amount to more than 2.4 million hectares (50% of irrigated arable land)
The area of non-irrigated farmland: non-irrigated arable land, pastures, hayfields is more than 2.3 million hectares
The task was complicated by the specificity of measuring the vibroacoustic characteristics, for the determination of which it was necessary to create special conditions for testing the pumps excluding the influence of noise and vibration disturbances [7,8]
Summary
In the XXI century, the systems of pumping water in the Republic of Uzbekistan amount to more than 2.4 million hectares (50% of irrigated arable land). The area of non-irrigated farmland: non-irrigated arable land, pastures, hayfields is more than 2.3 million hectares. Pumps are widely used in these areas. The experience of operating pumping stations (PS) is of great importance for developing countries, where climatic and hydrological conditions are similar [1,2]. A review of works devoted to improving the operating modes of centrifugal pumps showed that the developed mathematical models describe individual processes and most of them are not suitable for developing the most profitable operating modes; the problem of unsteady water movement in the PS has not been fully resolved [5,6]
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