Pressure-Driven Diffuser Width Control for Stable Centrifugal Compressors
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Solution Overview
Problem
Centrifugal compressors face instability and inefficiency due to mismatched cooling capacities under refrigerating and heating conditions, leading to gas flow stall and surging, and existing adjustable diffusers suffer from asynchronous movement caused by machining and assembly errors in cam guide rod mechanisms.
Innovation Solution
A centrifugal compressor with a diffuser featuring a pressure drive mechanism that synchronously moves a movable diffuser part through a pressure medium, adjusting the width of the pressure diffusion flow channel to maintain optimal cooling capacity under varying conditions, using a plurality of pressure drive mechanisms connected in series or parallel to ensure smooth and reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an adjustable diffuser driven by cam guide rod mechanisms is used to widen the working condition range, then the running range of the compressor is widened, but asynchronous movement occurs due to machining and assembly errors, leading to inclination and chucking of the adjustable diffuser
Solution Approach 1:
The patent replaces the mechanical cam guide rod drive mechanism with a magnetic drive system. The movable diffuser part is provided with a magnetic ring, and a drive assembly including a driving shaft and driving disc is configured to rotate the magnetic ring, thereby driving the movable diffuser part to rotate. This substitution eliminates the asynchronous movement problems caused by machining and assembly errors in mechanical mechanisms, improving reliability while maintaining the ability to adjust for different working conditions.
2Adaptability or versatility
If the cooling capacity under heating condition is reduced significantly compared to refrigerating condition, then the system meets heating requirements, but the same aerodynamic design cannot meet optimal cooling capacity requirements, leading to gas flow stall and surging
Solution Approach 1:
The patent implements a dynamically adjustable diffuser structure where the movable diffuser part can rotate to change the width of the pressure diffusion flow channel. This dynamic adjustment allows the diffuser to adapt to different cooling capacity requirements - narrowing the channel for high cooling capacity (refrigerating condition) and widening it for low cooling capacity (heating condition), thereby maintaining gas flow stability across different operating conditions.
Solution Approach 2:
The patent changes the geometric parameters of the pressure diffusion flow channel by rotating the movable diffuser part. The width of the flow channel is adjusted as a key parameter to match different cooling capacity requirements, preventing gas flow stall and surging that would occur with fixed aerodynamic design.
3Ease of operation
If a plurality of cam guide rod mechanisms are used to drive the annular adjustable diffuser, then the diffuser can be actuated, but machining and assembly errors cause the mechanisms to not move synchronously, resulting in unreliable operation
Solution Approach 1:
The patent replaces multiple mechanical cam guide rod mechanisms with a single magnetic drive system. The drive assembly rotates a magnetic ring on the movable diffuser part, eliminating the need for multiple separate drive mechanisms. This single-point drive approach inherently ensures synchronous movement without the assembly and machining errors that plague multi-mechanism systems.
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
The solution ensures stable and reliable operation by preventing gas flow stall and surging, widening the operating range, and reducing minimum load, while simplifying the drive structure and improving space efficiency.
Implementation Method 1
the movable diffuser part is configured to get close to or leave away from the other one of the first diffuser part and the second diffuser part under the action of a pressure medium in the pressure drive mechanism so as to adjust an width of the pressure diffusion flow channel
Data Source
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AI summary
The disclosure relates to a centrifugal compressor and a diffuser (100); the diffuser includes a pressure drive mechanism (10), a first diffuser part (32), a second diffuser part (34) and a movable diffuser part (50)movable diffuser part being connected with the pressure drive mechanism (10) and movably arranged on one of the first diffuser part (31) and the second diffuser part (34); moreover, the movable diffuser part gets close to or leaves away from the other one of the first diffuser part (31) and the second diffuser part (34) under the action of a pressure medium in the pressure drive mechanism (10) so as to adjust a width of a pressure diffusion flow channel (20) and prevent adverse phenomena such as gas flow stall and surging.