Compressor jet flow path structure

Abstract

A spray channel structure for the multi-class centrifugal compressor with curved reflux channel and reflux guide blade is composed of a bidirectional flow channel for the bidirectional division of the refrigerant filled externally and with the first and the second outlets, the first lateral spray channel communicated with the first outlet, and the second lateral spray channel communicated with the second outlet. Its advantages are uniform mixing of refrigerant and short channel and rotary axle.

Description

technical field [0001] The invention relates to a compressor spray channel structure, in particular to a compressor spray channel structure used in the double-side injection of refrigerant in the middle-pressure section of a multi-stage centrifugal compressor. Background technique [0002] For refrigeration machinery such as centrifugal refrigerators, centrifugal compressors are currently used as tools for pressurized delivery of refrigerants, and in order to improve the refrigeration cycle performance and refrigeration capacity of the refrigerator system, two or more The multi-stage (Multi-Stage) compressor with two or more stages replaces the traditional single-stage (Single-Stage) compressor, thereby improving the energy utilization efficiency of the refrigerator. [0003] The reason is that the multi-stage compression process is an Economizer Cycle process, through the function of the economizer in the middle of each stage, most of the refrigerant enthalpy (Enthalpy) can...

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Problems solved by technology

[0006] However, this existing two-stage (or multi-stage) compression design has its disadvantages in efficiency and cost. This is due to the fact that in the two-stage compression, injection into the compressor flow channel from the R2 direction (via the jet channel outlet 111) If the refrigerant cannot be evenly mixed with the refrigerant in the mainstream field at the outlet of the return guide vane 14, the pressure, temperature and density distribution of the fluid in each section will be uneven, which will affect the angle at which the refrigerant enters the next-stage impeller, forming an incident Angle (Incidence Angle) difference, resulting in reduction of aerodynamic efficiency (Aerodynamic Efficiency)

[0007] Therefore, for the existing compressor jet channel structure using unilateral jet flow, since the velocity field of the main refrigerant flow channel is greatly disturbed by the unilateral jet flow, in order to make the refrigerant uniformly mixed and avoid the above problems, usually It is considered to lengthen the flow path between the two-stage impellers, thereby lengthening the axial cantilever length L1 of the cantilever high-speed shaft; this will lead to a decrease in the rigidity of the high-speed shaft, and at the same time, due to the lengthening of the flow path, the flow loss increases and the axial dimension of the compressor Larger, there will be a great loss in efficiency, and the cost of materials will increase, and the control of refrigerant mixing will be poor

[0008] These are serious problems derived from one-sided jet flow, forming a bottleneck in the operation design of multi-stage centrifugal compressors

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