Pump shaft sleeve

Abstract

The invention provides a pump shaft sleeve. The pump shaft sleeve comprises an impeller spacer sleeve, an O-shaped sealing ring, a shaft sleeve body, an L-shaped key and a shaft sleeve nut. The tail end of the impeller spacer sleeve is provided with a plane. The front end of the shaft sleeve is not provided with a key groove but is provided with a 45-degree chamfer. The O-shaped sealing ring is mounted in a triangular area formed between the outer circle of a pump shaft, the plane of the tail end of the impeller spacer sleeve and the 45-degree chamfer of the front end of the shaft sleeve body.The tail end of the shaft sleeve body is provided with a notch. The L-shaped key has two sides, one side is mounted in a key groove of the pump shaft, and the other side is mounted in the notch of the tail end of the shaft sleeve body. The shaft sleeve nut is axially located on the pump shaft. The shaft sleeve can be machined from a thick-wall steel tube without casting. According to the pump shaft sleeve locating structure, the O-shaped sealing ring can be mounted at the front end of the shaft sleeve to prevent medium leakage without increasing the length of the pump shaft. Before the shaftsleeve nut is tightened, an impeller, the impeller spacer sleeve, the O-shaped sealing ring, the shaft sleeve body and the L-shaped key all can move on the pump shaft in the axial direction to achievethe axial position regulating function.

Description

technical field [0001] The invention belongs to the technical field of water pumps, and relates to a pump shaft sleeve, in particular to a pump shaft sleeve which is circumferentially positioned at the tail end of the shaft sleeve. Background technique [0002] The pump shaft sleeve is a common wearing part in the pump structure. It is mainly used in conjunction with the seal to prevent the medium from leaking out of the pump. It is designed to protect the pump shaft. The position between the pump shaft sleeve and the main shaft is generally as follows: use a flat key at the front end of the shaft sleeve for circumferential positioning and use a shaft sleeve nut or round nut for axial positioning at the tail end. This positioning method requires that the front end of the shaft sleeve has sufficient wall thickness to install the flat key, and the wall thickness of the shaft sleeve itself is relatively thin. Generally, the impeller retainer sleeve and the shaft sleeve are desi...

AI Technical Summary

Problems solved by technology

Due to the thicker wall thickness, these two types of bushings are generally cast, but casting of thicker thick-walled parts or parts with uneven thickness is prone to defects, and the scrap rate is very high

In addition, for pumps conveying high-temperature or corrosive media, in order to prevent the impeller and impeller retaining sleeve or the big head part of the shaft sleeve from infiltrating the medium between the shaft sleeve and the pump shaft due to casting defects and leaking from the tail end of the shaft sleeve, it is generally necessary Install an "O" seal ring between the shaft sleeve and the shaft sleeve. In the above two cases, the "O" seal ring cannot be installed at the front end of the shaft sleeve due to the keyway connecting the flat key, so only a short sleeve can be added at the end of the shaft sleeve. To install the "O" type sealing ring, this increases the length of the pump shaft and reduces the strength of the rotor, or increases the cost by increasing the shaft diameter to ensure the strength of the rotor

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