Sealing structure for centrifugal pump

Abstract

The invention discloses a sealing structure for a centrifugal pump. The centrifugal pump comprises a motor assembly, a pump shaft and a pump body assembly. The pump body assembly includes a pump sleeve and a plurality of impeller stage sets. The impeller stage set comprises a supporting shell, a flow guide shell and an impeller. The impeller comprises a hub part, a conical wall, blades and an impeller seat. The sealing structure comprises a dynamic sealing structure and a water throwing groove sealing structure. The dynamic sealing structure comprises an outer static sealing ring. The outer static sealing ring comprises a radial contact part and an axial contact part. A first space is defined between the radial contact part and a cylindrical base part of an impeller seat of an impeller of the centrifugal pump, and a second space is defined between the axial contact part and the cylindrical base part. A width of the first space in the radial direction is smaller than a width of the second space in the axial direction. The water throwing groove sealing structure comprises a plurality of water throwing grooves formed in the circumferential direction of the flow guide shell.

Description

technical field [0001] The application relates to a sealing structure for a centrifugal pump, in particular to a sealing structure for a multi-stage centrifugal pump for deep wells with high rotational speed and high lift. Background technique [0002] The centrifugal pump for deep well generally includes a motor assembly and a pump body assembly including an impeller driven to rotate by a pump shaft. The pump shaft speed of the traditional centrifugal pump is generally around 3000rpm. If the head of the water output by the centrifugal pump reaches 300m, the height of the centrifugal pump may reach 3m. Therefore, this kind of deep well pump is large and heavy. [0003] Centrifugal pumps for deep wells are mostly used for agricultural irrigation, and the operating environment is usually at a depth ranging from 100m to 500m underground. In applications with harsh natural environments such as mountains, it is very inconvenient to operate. In particular, for the handling of ce...

AI Technical Summary

Problems solved by technology

In applications with harsh natural environments such as mountains, the operation is very inconvenient

In particular, only for the handling of centrifugal pumps, the staff need to lift them to the top of the mountain by manpower, which may take several hours or even a day, to install the huge and heavy centrifugal pumps to the bottom of the well hundreds of meters deep and the follow-up Possible repairs are very difficult

This largely limits the application of centrifugal pumps

In the process of improving the pump, in order to increase the head of the centrifugal pump, the method of increasing the diameter of the impeller is usually used, which further increases the volume and weight of the pump, and aggravates the above-mentioned inconvenience of the pump.

[0004] In such cases, the sealing configuration in the centrifugal pump dissipates a large amount of work and generates vibrations, reducing the overall efficiency of the centrifugal pump

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