An Improved Back Suction Anticorrosion Pump

Abstract

Disclosed is an improved posterior-suction type anticorrosive pump. The improved posterior-suction type anticorrosive pump comprises a lining-plastic / all-plastic pump shell, a lining-plastic pump cover installed at one end of the pump shell, and a lining-plastic suction inlet tee which is installed in a center hole of the pump cover and communicated with an inner cavity of the pump shell. A main shaft is arranged in a pipeline where the suction inlet tee and the inner cavity of the pump shell are communicated in the axial direction. An impeller is arranged at one end of the main shaft, extending into the inner cavity of the pump shell. One end of the main shaft, extending out of the suction inlet tee, is connected with a bearing support fixed on the pump cover. Wear-resisting lining is inlaid on the cavity inner wall formed by the pump shell inner wall and the pump cover and on the inner wall of the suction inlet tee. Due to the fact that a layer of wear-resisting lining is additionally arranged in the pump shell, the pump cover and the suction inlet tee, wear resistance of a pump body is improved, and service life is prolonged.

Description

technical field [0001] The invention relates to the field of centrifugal pump manufacture, in particular to a back-suction anti-corrosion pump. Background technique [0002] Anti-corrosion and wear-resistant pumps are required to transport corrosive slurry in the chemical industry, non-ferrous metal hydrometallurgy, mine dressing, and fertilizer industries, because the fluorine, sulfuric acid, hydrochloric acid and other strong corrosive media contained in the slurry transported in these industries have a great impact on the pump. High anti-corrosion requirements, these slurries contain a lot of solids, so the requirements for pump wear resistance are also high. There are three commonly used anti-corrosion and wear-resistant pumps: ceramic pumps, plastic-lined (full plastic) pumps, and back-suction plastic anti-corrosion and wear-resistant pumps. These three types of pumps have their own advantages and disadvantages: [0003] The advantages of ceramic pumps are anti-corrosi...

AI Technical Summary

Problems solved by technology

But this kind of pump also has the following two shortcomings that are difficult to overcome: one is that when the lining pottery parts of the pump casing and pump cover are combined and installed, such as figure 1 The sealing surface shown in middle 12 is under force, which is easy to crack and damage; the second is that the suction port of the pump is in the same direction as the shaft, and the fluid pressure at the shaft seal is high, and the seal is easily damaged and leaked

[0004] Plastic-lined (all-plastic) pumps have excellent anti-corrosion performance and installation performance. During installation, the sealing surface of the pump casing and pump cover is plastic, so it is not easy to crack, and it is very convenient for sealing installation, but there are also two disadvantages: One is that the plastic-lined pump has poor wear resistance against solid materials, and its service life is very short. It is used in the zinc smelting and leaching section, and its service life is only 20 to 30 days. Second, the fluid pressure in the shaft seal cavity is high, and the seal is easily damaged and leaked.

However, this pump also has a shortcoming that is difficult to overcome, that is, the wear resistance is poor, and the service life is very short in abrasive slurry. For example, the service life of the pump casing and pump cover in compound fertilizer slurry is only 10 to 15 days.

[0006] Therefore, the above three commonly used corrosion-resistant and wear-resistant pumps are still the main types of pumps in the chemical and smelting industries. Although they can all be used, the results are not ideal, and the general service life is mostly 1 to 2 months. about

Therefore, there is still room for improvement

[0007] In addition, in the original technology of making ceramic pumps, due to the complex structure of the pump casing and the difficulty in making it, it is often impossible to apply materials such as glass-ceramic and silicon carbide, which have good wear resistance and difficult processing, to the manufacture of wear-resistant pumps. There is no report in this regard, so the application of wear-resistant new materials such as glass ceramics in the production of pump technology also has room for improvement.

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