Mouth ring fixed connection structure of multistage centrifugal pump and quick detaching method for mouth ring fixed connection structure

Abstract

The invention relates to the technical field of hydraulic engineering design of pump bodies, in particular to a mouth ring fixed connection structure of a multistage centrifugal pump and a quick detaching method for the mouth ring fixed connection structure. The mouth ring fixed connection structure comprises a pump body upper mouth ring and a pump body lower mouth ring and is characterized in that a connecting hole is formed in a connected part of the pump body upper mouth ring and the pump body lower mouth ring; a shoulder screw is connected in the connecting hole; the shoulder screw is used, that is, the upper-half part of the shoulder screw is used for locating and the lower-half part of the shoulder screw is used for connecting. According to the scheme, the problem of insufficient space is solved; a gap is formed in the pump body upper mouth ring and is convenient for operation of mounting a tool; the connecting hole is formed in the connected part of the pump body upper mouth ring and the pump body lower mouth ring; a hollow cylindrical pin is connected in the connecting hole; threads are arranged on the inner side of the hollow cylindrical pin and are connected with an oval fillister head screw; one end of the oval fillister head screw penetrates through the hollow cylindrical pin and is connected with the pump body lower mouth ring; a clearance is further reduced.

Description

technical field [0001] The invention relates to the technical field of water conservancy design of a pump body, in particular to a fixed connection structure of a mouth ring of a multistage centrifugal pump and a quick disassembly method thereof. Background technique [0002] The pump body mouth ring of the multi-stage split centrifugal pump is a very important part, and the number of parts is large. In order to facilitate the installation, maintenance and replacement of the pump body mouth ring, the pump body mouth ring is usually designed as a split structure ( figure 1 ). This split-open pump body mouth ring has high precision requirements on the inner diameter d and outer diameter D, especially the inner diameter d requires the cylindricity to be within 0.02mm. If this requirement cannot be met, the pump body mouth ring and The rotor will produce eccentric wear, which will affect the normal operation of the pump and greatly shorten the life of the pump. Therefore, it i...

AI Technical Summary

Problems solved by technology

[0004] Option 1. The mouth ring of the split pump body is only connected by screws; this solution is simple, but the two halves are easily misaligned during processing, and the required accuracy cannot be achieved.

[0005] Option 2: Use ordinary cylindrical pins for positioning and screw connections; this solution meets the requirements of processing technology and can ensure both positioning and connection, but the axial size of the pump body mouth ring is limited and the space is small, so it is difficult to accommodate both cylindrical pins and screws

[0006] Utilizing the above two design schemes, the inner diameter d cylindricity of the mouth ring of the split-open pump body is much greater than 0.02mm, and there are obvious misalignment phenomena in the secondary assembly process, and the processed products are unqualified

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