Centrifugal Compressor Casing Intake Nozzle Segmentation
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Solution Overview
Problem
The demand for reducing the size of centrifugal compressors while maintaining performance is challenging due to increased flow velocity and pressure loss in the intake volute, which degrades performance in existing flow split type structures.
Innovation Solution
A centrifugal compressor casing design featuring multiple intake nozzles arranged at intervals in the circumferential direction, which allows fluid to flow uniformly into the intake volute and impeller channel, eliminating the need for additional direction-changing members and preventing fluid release, and optionally including a bypass line between main and auxiliary nozzles for enhanced flow management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the centrifugal compressor is reduced, then the compactness is improved, but the flow velocity in the intake volute increases causing pressure loss and performance degradation
Solution Approach 1:
The single intake nozzle is divided into multiple intake nozzles (main intake nozzle and auxiliary intake nozzles) arranged at intervals in the circumferential direction. This segmentation allows the fluid to enter through multiple points, reducing the flow velocity at each entry point and preventing excessive pressure loss while maintaining a compact overall compressor size.
2Volume of moving object
If the size of the centrifugal compressor is reduced, then the compactness is improved, but additional members are needed to change flow direction quickly which increases device complexity
Solution Approach 1:
The intake system is segmented into multiple nozzles positioned at different circumferential locations. This arrangement allows the fluid flow to be naturally directed along the axis without requiring additional flow-direction changing members, thus reducing device complexity while maintaining compact dimensions.
3Stability of the object's composition
If multiple intake nozzles are provided at intervals in the circumferential direction, then the fluid flow uniformity is improved, but the device complexity increases
Solution Approach 1:
The intake system uses multiple nozzles (one main and one or more auxiliary nozzles) distributed circumferentially to achieve uniform fluid distribution. The nozzles are integrated into the casing structure, and the configuration is designed to be as simple as possible while maintaining flow uniformity, thus minimizing the increase in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables the reduction of compressor size without performance degradation by ensuring uniform fluid flow and preventing fluid release, while maintaining efficient compression capabilities.
Implementation Method 1
fluid portions flowing into the intake volute from the intake nozzles collide with each other in the intake volute so that it is possible to quickly change a direction in which the fluid flows to the direction of the axis
Implementation Method 2
a processing gas taken into an intake volute from an intake nozzle is compressed in a flow channel of an impeller that rotates together with a rotation shaft
Data Source
AI summary
A centrifugal compressor includes a casing body (11) configured to rotatably support a rotation shaft (2) and an impeller (3) fixed to the rotation shaft around an axis (O), the casing body in which an intake volute (B1) which has a ring shape centered on the axis and through which a processing gas (G) is caused to flow in a direction of the axis and is introduced into a flow channel of the impeller, and a discharge volute which has a ring shape centered on the axis and through which the processing gas is discharged from the flow channel are formed; and a plurality of intake nozzles (16) which communicate with the intake volute and are able to cause the processing gas to flow into the intake volute from the outside and are provided at intervals in a circumferential direction around the rotation shaft.