Installation Process of Impeller Hub Cap of Nuclear Main Pump

Abstract

The invention relates to a process for installing the hub cap of the impeller of a nuclear main pump. The method of drilling the pin hole of the impeller (9) is adopted: the first cylindrical pin (1) with a tip is used to install the hub cap (5) of the impeller to determine the impeller. The position of the pin hole in (9) is positioned simultaneously with the first cylindrical pin (1) and the second cylindrical pin (2) in the circumferential direction to complete the radial positioning of the impeller hub cap (5), and the gasket (4) is adjusted by grinding ) thickness to complete the gap between the impeller hub cap (5) and the impeller (9) to achieve the axial positioning of the impeller hub cap (5). The invention guarantees that the hub cap of the impeller maintains a theoretical gap with the impeller during operation, prevents the main pump from vibrating, and ensures that the shrinkage bolt does not fall off during high-efficiency operation by welding the locking piece, and has practical effects Good, achieving the expected effect of nuclear power main pump installation.

Description

Technical field: [0001] The invention relates to a process for installing a hub cap of an impeller of a nuclear main pump. Background technique: [0002] The impeller hub cap is the primary part of the nuclear main pump and the rotating part of the main pump. It is located at the bottom of the entire shafting part. The speed of the main pump is 1486 rpm when the main pump is in normal operation. The impeller hub cap supports the impeller, and the theoretical assembly gap between the impeller hub cap and the impeller is only 1__1.2mm. Since the impeller hub cap is positioned with the impeller nut and the impeller through two cylindrical pins, three parts need to be matched at the same time. Assembly, such as figure 1 As shown, the assembly is difficult. If the impeller hub cap cannot be installed correctly, the following possible injuries will occur. [0003] First: Since the hole on the impeller nut cannot be guaranteed to be on the same plane as the hole of the impeller ...

AI Technical Summary

Problems solved by technology

[0003] First: Since the hole on the impeller nut cannot be guaranteed to be on the same plane as the hole of the impeller during the installation process, the following phenomenon will occur during the installation of the impeller hub cap: after one straight pin is in place smoothly, the other straight pin cannot be in place. bit, there is a deviation between the hole and the cylindrical pin

[0004] Second: If the gap between the impeller hub cap and the impeller is too large, the main pump will vibrate during high-speed rotation, reducing the service life of the main pump

[0005] Third: If the waist bolt is rotated after installation, it will cause the hub cap of the impeller to fall off, resulting in a great safety hazard

[0006] At present, there is no precedent for nuclear main pump manufacturing in China, and there is no experience to learn from. We need to constantly explore and research to invent a set of reasonable impeller hub cap installation process.

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