Pressure expander blade, compressor structure and compressor

Abstract

The invention discloses a pressure expander blade, a compressor structure and a compressor. The pressure expander blade comprises a blade body, and a cavity is formed in the blade body. Air supplementing holes are formed in the blade body. According to the pressure expander blade, the compressor structure and the compressor, jet flow can be formed on the suction surface of the pressure expander blade by means of air supplementing through the pressure expander blade of the hollow structure and the air supplementing holes in the back portion of the pressure expander blade so as to blow down a low-speed and low-energy area formed on the suction surface, airflow mixing losses caused by air supplementing are reduced, and therefore aerodynamic efficiency of the centrifugal compressor is improved, and the operation range of the compressor can be widened while the aerodynamic performance of compressor design points is improved.

Description

technical field [0001] The invention relates to the field of compressors, in particular to a diffuser vane, a compressor structure and a compressor. Background technique [0002] In a centrifugal compressor, since the temperature of the gas will rise sharply after being compressed, the specific volume of the gas is very large at high temperature, and the energy consumption of the compressor will increase sharply under the condition of ensuring the same cooling capacity. In order to reduce the power consumption of the compressor and increase the refrigeration capacity, a multi-stage compression refrigeration cycle is commonly used. [0003] The most widely used at present is the "two-stage compression intermediate incomplete cooling refrigeration cycle" with a flash vapor separator (commonly known as an economizer). The two-stage compression refrigeration cycle is to mix the flash steam separated from the economizer with the exhaust gas from the low-stage compression, which ...

AI Technical Summary

Problems solved by technology

However, due to the difference in air velocity and direction between the mainstream and the supplementary air flow in the current supplementary air scheme, the supplementary air produces a large airflow mixing loss and reduces the aerodynamic efficiency of the compressor.

[0004] In addition, in a centrifugal compressor, the use of a vane diffuser can effectively improve the aerodynamic performance of the compressor at the design point.

[0005] The blades generate large low-speed and low-energy areas, which eventually lead to compressor stall and surge, reducing the stable operating range of the compressor

Although the compressor has a wide range of operation using a vaneless diffuser, the performance of the design point is low

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