Centrifugal compressor air inlet passage and impeller concentricity adjusting structure

Abstract

The invention discloses a centrifugal compressor air inlet passage and impeller concentricity adjusting structure, which comprises an impeller, an air inlet passage, a volute, a rotating shaft and a shell. The volute is fixed to the shell, the air inlet passage is positioned on the inner side of the volute, the rotating shaft is rotationally arranged in the shell, the top end of the rotating shaftextends into the air inlet passage and is fixedly connected with the impeller, three oblique slider mechanisms are uniformly distributed between the air inlet passage and the volute and fixed to thevolute, and one end of each oblique slider mechanism is abutted against the outer peripheral wall of the air inlet passage. Low compressor part machining precision requirements and low cost are realized, concentricity of the air inlet passage and the impeller is higher than that of an original version, and a slope and thread dual self-locking method is convenient and reliable. In addition, a centrifugal impeller with the structure is low in tip air leakage loss and high in fluid efficiency.

Description

Technical field: [0001] The invention relates to a structure for adjusting the concentricity of an air intake passage of a centrifugal compressor and an impeller. Background technique: [0002] In a centrifugal compressor, the gap between the inlet and the impeller is an important parameter that affects the performance of the fan. The gap between the inlet and the impeller affects the efficiency and safety of the fan, and the gap is restricted by the concentricity. [0003] Centrifugal compressors have a roughly conical impeller mounted in a flared cavity at the end of the intake. The selection of the gap between the inlet channel and the impeller usually needs to consider the following two influencing factors: [0004] 1) When the compressor is working, the centrifugal impeller rotates at high speed, but the air inlet is still. At this time, the relative speed between the blade tip of the centrifugal impeller and the surface of the inlet can reach more than 200m / s. At t...

AI Technical Summary

Problems solved by technology

[0014] To sum up, the concentricity of the inlet port and the impeller is difficult to guarantee only by the tolerance of the parts. Therefore, in order to keep the cost of processing and assembly not too high, only part of the efficiency can be sacrificed.

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