Novel multi-stage centrifugal pump device and manufacturing method

Abstract

The invention discloses a novel multi-stage centrifugal pump device which mainly comprises a shaft box, a water inlet section, a water outlet section, a middle section, a stuffing box and a perforated rod. A perforated seat used for fixing the perforated rod and a base are not arranged on the water inlet section and the water outlet section, the perforated seat is arranged on the shaft box or the perforated rod is fixedly welded to the water inlet section and the water outlet section, a main body of the stuffing box is segmented from a cooling device, and therefore the surface smooth finish is high. The invention further discloses a manufacturing method of the novel multi-stage centrifugal pump device, and parts which do not make contact with corrosive media are made of cast iron materials instead of stainless steel materials. The novel multi-stage centrifugal pump device mainly aims at a multi-stage centrifugal pump made of the stainless steel materials, and on the basis of achieving the same effects, the novel multi-stage centrifugal pump device and the manufacturing method have the advantages of precisely manufacturing, saving the cost, improving the efficiency and reducing energy and resources.

Description

technical field [0001] The invention relates to the technical field of multistage centrifugal pumps, in particular to an energy-saving, quality-improving and consumption-reducing device and a manufacturing method for multistage centrifugal pumps made of stainless steel. Background technique [0002] At present, the multi-stage centrifugal pumps produced on the market are all made of the same set of drawings to make molds regardless of the materials such as cast iron, cast steel, and cast stainless steel. How big is the improvement (mainly in terms of saving material composition), but for high-priced materials (such as stainless steel 304 materials, etc.), there is a lot of room for improvement in terms of saving material costs. At present, the centrifugal pumps on the market all use the same The set of drawings is cast from the same material. Since many centrifugal pumps are exposed to corrosive media, considering the service life of the equipment, many of them now use stain...

AI Technical Summary

Problems solved by technology

[0002] At present, the multi-stage centrifugal pumps produced on the market are all made of the same set of drawings to make molds regardless of the materials such as cast iron, cast steel, and cast stainless steel. How big is the improvement (mainly in terms of saving material components), but for high-priced materials (such as stainless steel 304 materials, etc.), there is a lot of room for improvement in terms of saving material costs. Currently, the centrifugal pumps on the market all use the same The set of drawings is cast from the same material. Since many centrifugal pumps are exposed to corrosive media, considering the service life of the equipment, many of them now use stainless steel as the material. As a result, many parts that do not need to be in contact with corrosive media are also made of stainless steel. Casting, resulting in a substantial waste of manufacturing costs

[0003] On the other hand, because the same set of drawings is used for casting, the original structure of the water inlet and outlet section and the stuffing box body are relatively complex, so only sand casting can be carried out, resulting in many casting defects of the product, and the product often needs to be processed during processing. Welding repair, and the difficulty of processing is relatively large. The product is subjected to strong pressure. Due to inevitable casting defects, such as sand holes, pores, sand inclusions, etc., the success rate of the final product has a greater impact accordingly. In addition, sand casting products The surface finish is poor, and the runner finish cannot be compared with precision casting. Correspondingly, the product ultimately affects the efficiency

Due to the large number of pores and sand holes, and the need for more welding repair time, the corresponding processing difficulty is increased and the work efficiency is low

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