Vertical multi-stage centrifugal pump shaped by stamping and welding

Abstract

This invention relates to a punching welding standing multiple-step centrifugal pump, which comprises impeller, flow guiding part, water-in pipe and water-out pipe and outer cylinder shell. The outer cylinder shell is located with multiple-step flow guiding parts and impellers, wherein the parts comprise guiding impellers and the parts and the impellers are shaped through punching and welding. The guiding cylinder wall bends up its top end to form an end wall of a middle opening and the surround wall is plugged in another guiding opening and the multiple guiding parts are formed into one inner cylinder shell. The water-in pipe is connected to the inside of the inner cylinder shell and the water-out pipe is connected to the hollow chamber between the inner and outer cylinder shells.

Description

Technical field: [0001] The invention relates to a centrifugal pump for increasing liquid pressure and making it flow, in particular to a vertical multistage centrifugal pump suitable for small flow rate and high head which is formed by stamping and welding processes. Background technique: [0002] In the prior art, vertical multistage centrifugal pumps with small flow rate and high lift generally have many shortcomings: most vertical multistage centrifugal pumps are cast, not only the structure of the flow-passing parts is complicated, the product is heavy, and the material consumption is large ; The hydraulic performance of the pump is not ideal, and the operation is biased, and the efficiency is low; in addition, the casting process will also cause environmental pollution; And the flow channel of guide vane is narrow and long, it is difficult to realize with casting technology. [0003] In order to overcome the above shortcomings of casting vertical multistage centrifuga...

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Problems solved by technology

[0002] In the prior art, vertical multistage centrifugal pumps with small flow rate and high lift generally have many shortcomings: most vertical multistage centrifugal pumps are cast, not only the structure of the flow-passing parts is complicated, the product is heavy, and the material consumption is large ; The hydraulic performance of the pump is not ideal, and the operation is biased, and the efficiency is low; in addition, the casting process will also cause environmental pollution; The flow channel of guide vane and guide vane is narrow and long, which is difficult to realize by casting process

Although this kind of vertical multistage centrifugal pump reduces the weight of the water pump to a certain extent, it is expensive and the performance-price ratio is not high, and it does not fundamentally solve the problems caused by the casting process in the production of vertical multistage centrifugal pumps.

Now there are also some enterprises producing vertical multi-stage centrifugal pumps whose main components such as the outer cylinder, impeller and deflector are all manufactured by stamping welding process, but because of their unreasonable design and structure, there are the following problems: impeller, deflector The strength and rigidity of components such as the device and cylinder are not enough, the working reliability is poor, and the service life is short; the hydraulic performance of the water pump is not good, and the operating efficiency is not high

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