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Pump energy loss through which channels?
Pump as a power source for material transport, there is energy loss in the energy conversion process is inevitable, since there is energy loss, there will be some people to study how to improve the efficiency of the pump, and this We must first understand the pump energy loss which ways. Pump energy loss through which channels? In a nutshell, the energy loss in the pump mainly includes the following three aspects: 1. The mechanical loss is mainly the friction loss (also called disk loss) between the liquid and the outer surface of the impeller front cover and the pump cavity. Disk loss accounted for a large proportion, even up to 30% of active power. Experiments show that the loss of the disk and the rotation speed is proportional to the cube, and the outer diameter of the impeller is proportional to the fifth power. Therefore, the larger the outer diameter of the impeller, the larger the disc loss. Although disc loss is proportional to the cube of the speed, the outer diameter of the impeller decreases correspondingly with increasing speed (given that the pump speed is doubled and the outer diameter of the impeller is reduced by half) As the speed increases, the disc loss does not increase, but declines, which is one of the reasons for the development of high-speed pumps. 2, the volume loss Some of the impeller liquid leaks through the impeller seal ring gap back to the impeller imports can not be effectively utilized, the formation of losses. Therefore, the seal ring gap should be as small as possible, but due to processing and assembly and other reasons, too small a gap may form eccentric wear or stuck, the national standard for various types of pump gap made a special provision. 3, hydraulic loss Pump over-current part (from import to export) liquid fluid must have the speed and the direction of change caused by the loss of these two parts is the hydraulic loss. To reduce this part of the loss, in addition to improving the smoothness of the flow components, try to use the best hydraulic model. (Editor: Sea of ​​clouds) Extended reading: 2016 Beijing Petroleum Exhibition pump valve pipe fittings exhibition information 2016 Exhibition 2016 Xiamen Industry Fair