Method and structure for prolonging service life of sand pump of sand-blasting machine

Abstract

The invention discloses a method and a structure for prolonging the service life of a sand pump of a sand-blasting machine. An impeller mechanism of the sand-blasting machine is adjusted, a group of blades are added on the top surface of an impeller, and in the working process of the sand pump, negative pressure is further formed in the central area of the back surface of the impeller by the aid of the added blades, so that a gap between a transmission shaft and a sand pump casing is located in a low-pressure area, a gap between shaft casings is in a negative pressure suction state, sand water cannot be sprayed out, no baffles are required to be welded on the transmission shaft, a motor cannot be damaged, and the overall service life of the sand pump is remarkably prolonged. The structure is simple, the cost is low, and the use effect is ideal.

Description

technical field [0001] The invention relates to the field of machinery, in particular to a method and a structure for improving the service life of a sand pump of a sandblasting machine. Background technique [0002] At present, the sand pump usually adopts a centrifugal pump, and the shell, impeller and blade of the sand pump are all made of polyurethane, which is resistant to sand wear, such as figure 2 As shown, when the drive shaft drives the impeller to rotate at high speed, the blades throw the sand and water to the side to form a high-pressure area, the outlet of the sand pump is set in the high-pressure area, and a low-pressure area is formed in the center, so the sand-water inlet is set in the low-pressure area. When the sand pump is working, since there are no blades on the back of the impeller, the sand water cannot be shaken. At this time, the high-pressure area will reach the drive shaft in the central area from the edge of the pump casing. Such a structure wi...

AI Technical Summary

Problems solved by technology

Such a structure will cause sand and water to rush out from the gap between the shaft shells. The current solution is to weld a baffle plate on the drive shaft of the motor

However, due to the strong erosion and wear ability of the sand water washed out under high pressure, the sand water will cause the gap between the shaft shells to become larger and larger, and the baffle wears quickly, so repair welding is often required. For repair welding, the sand water flushed out will quickly damage the motor

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