Water pump rotor shaft and assembling method thereof

Abstract

The invention relates to a water pump rotor shaft and an assembling method thereof. The water pump rotor shaft and the assembling method thereof solve the problem existing in threaded waterproof connection between a hexagonal shaft section and a circular shaft section. According to the technical scheme of the water pump rotor shaft, a cylindrical inner hole is formed in the connecting end of the circular shaft section, a circular shaft body is arranged at the connecting end of the hexagonal shaft section and is inserted into the cylindrical inner hole so as to form interference fit. The methodcomprises the following steps that the connecting end of the hexagonal shaft section is machined so as to enable the connecting end to form the circular shaft body; the connecting end of the circularshaft section is machined so as to enable the connecting end to form the cylindrical inner hole; a discharge hole is machined in the circular shaft section, is formed in the position of the bottom ofthe cylindrical inner hole and communicates with the cylindrical inner hole; the circular shaft section and the hexagonal shaft section are clamped and are enabled to be positioned on the same straight line; the connecting end of the circular shaft section is heated; and in the heating process, the connecting end of the hexagonal shaft section is inserted into the cylindrical inner hole. The water pump rotor shaft and the assembling method thereof have the technical effects that the rotor shaft is formed through interference inserted-connection fit between the cylindrical inner hole and a cylinder, and the straightness of the rotor spindle can be greatly improved.

Description

technical field [0001] The invention relates to a water pump rotor shaft and an assembly method thereof. Background technique [0002] When the submersible electric pump is in use, part of the rotor shaft on the submersible electric pump is immersed in water, and the other part is not in contact with water. The part immersed in water is a hexagonal shaft segment (used to assemble the impeller with a hexagonal shaft hole), because of its diving use, Corrosion resistance is required, usually 304 stainless steel. The part not in contact with water is a circular shaft section, which has lower requirements on corrosion resistance, but it needs to have good magnetic permeability, and 45# steel is usually used. [0003] The hexagonal shaft section and the round shaft section are processed separately, and bolts and threaded holes are processed on the hexagonal shaft section and the round shaft section respectively, and are connected by threads and applied with thread glue to preven...

AI Technical Summary

Problems solved by technology

[0003] The hexagonal shaft section and the round shaft section are processed separately, and bolts and threaded holes are processed on the hexagonal shaft section and the round shaft section respectively, and are connected by threads and applied with thread glue to prevent loosening, but there are still gaps between the threads. It is difficult to ensure the straightness of the rotor shaft. At the same time, there is stress in the connection of the thread, which affects the strength, and then affects the performance and service life of the pump.

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