Process pump for petrochemical industry

Abstract

The invention relates to a process pump for petrochemical industry. The process pump comprises a pump shell, a pump cover and a pump shaft; an impeller cavity is formed between the pump shell and the pump cover; an impeller which is connected to one end of the pump shaft and can be driven by the pump shaft to be rotated is arranged in the impeller cavity; the impeller is provided with a balance hole; the pump shell is provided with a pump inlet and a pump outlet; the surface of the inner wall of the impeller cavity formed by the pump cover is a flow guide surface; a sealing cavity is formed between the pump cover and the pump shaft; a mechanical sealing device is arranged in the sealing cavity; the flow guide surface is provided with a plurality of flow guide ribs which are radial from the center of the flow guide surface to the outer circumference; and when the pump shaft drives the impeller to rotate, a low pressure area is formed on a back pressure side of each flow guide rib, and a through hole which is communicated to the sealing cavity from the impeller cavity is formed in the low pressure area. The process pump has the combined structure of the flow guide ribs and the through hole, so that solid particles flowing in the sealing cavity and heat produced by friction of the mechanical sealing device can be carried away timely, the circulating cooling cleaning of a pump body can be realized, and the failure of the mechanical sealing device can be effectively avoided.

Description

technical field [0001] The invention relates to a petrochemical process pump. Background technique [0002] Petrochemical pumps are the most used rotating equipment in petrochemical production equipment, and also the equipment that consumes the most energy. The electricity consumption accounts for about 50% of the electricity consumption of the whole plant. The pressure of the medium conveyed by the petrochemical pump ranges from back pressure to 300MPa, and the temperature ranges from minus 140°C to nearly 500°C. Some of the medium are viscous, some contain solid particles, and most of them are corrosive. Therefore, finding a way to eliminate the influence of medium pressure, temperature, viscosity, solid content, corrosion, etc. on the pump is the key to ensuring the safe and stable operation of the pump and mechanical seal. Traditional petrochemical pumps have high requirements on the pressure, temperature, viscosity, solid particle content, and corrosiveness of the conv...

AI Technical Summary

Problems solved by technology

Traditional petrochemical pumps have high requirements on the pressure, temperature, viscosity, solid particle content, and corrosiveness of the conveying medium, which cannot be used not only for high-temperature media, but also for high-pressure, high-viscosity, and media containing solid particles. The scope of application of chemical pumps is small

[0003] For the medium containing solid particles, the traditional method is to introduce fluid from the pump outlet into the sealing chamber, and at the same time install a hydrocyclone in the introduction pipeline, and use the filtered medium to flush the sealing chamber. Although this solution can achieve flushing purpose, but the wear on the impeller and pump cover is serious, which affects the service life of the pump

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