Centrifugal impeller assembly and centrifugal compressor

Abstract

The invention relates to a centrifugal impeller assembly. The centrifugal impeller assembly is characterized by comprising centrifugal impellers (1, 2) and inlet flow guide blades (3, 3') arranged at the front sides of inlets of the centrifugal impellers (1, 2), wherein the inlet flow guide blades (3, 3') comprise a plurality of flow guide blade bodies (31) which rotate synchronously along the centrifugal impellers (1, 2); and a difference value range between outlet installation angles of the flow guide blade bodies (31) and inlet installation angles of blades of the centrifugal impellers (1, 2) ranges from -10 degrees to 10 degrees. With the adoption of the centrifugal impeller assembly, when the centrifugal impellers rotate, fluid flowing through the inlet flow guide blades can smoothly enter the centrifugal impellers, and the impact loss and separation loss on the centrifugal impellers by the fluid are reduced; and when the centrifugal impeller assembly is applied to a centrifugal compressor, the performance of the centrifugal compressor in a partial loading process can be effectively improved, and an operation range of the centrifugal compressor is expanded.

Description

Technical field [0001] The present invention relates to the technical field of air compression, in particular to a centrifugal impeller assembly and a centrifugal compressor. Background technique [0002] The centrifugal compressor is a kind of equipment that uses the high-speed rotating impeller to work on the gas flowing in the radial direction to obtain the kinetic energy of the gas, and then convert it into pressure energy after the diffuser flow. The centrifugal compressor has operating conditions of full load operation and partial load operation, in which the compressor efficiency under the partial load operating condition is lower than the compressor efficiency under the full load operating condition. Through research, the inventor found that the reason for this problem is that the installation angle of the impeller blades is designed according to the gas flow angle under full load operating conditions, and the gas flow angle at the impeller inlet under partial load operat...

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Problems solved by technology

Through research, the inventor found that the reason for this problem is that the installation angle of the impeller blades is designed according to the gas flow angle under the full-load operating condition, while the gas flow angle at the impeller inlet under the part-load operating condition is different from that of the impeller blades. The installation angle of the centrifugal compressor is inconsistent, so when the operating condition of the centrifugal compressor is changed from the full load operating condition to the partial load operating condition, or the load is adjusted in the partial load operating condition, the gas flow angle at the inlet of the impeller (referred to as the air flow Angle) is inconsistent with the installation angle of the impeller blades, resulting in airflow impact, and the greater the deviation between the airflow angle and the impeller installation angle, the greater the airflow impact loss

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