Centrifugal Compressor Internal Hot Gas Bypass with Inlet Guide Vane
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Solution Overview
Problem
Centrifugal compressors experience surging issues during low loading conditions due to increased pressure differences, leading to inefficient refrigerant flow and potential damage, which conventional solutions address by isolating IGV and bypass structures, resulting in complex piping and additional control requirements.
Innovation Solution
An internal hot gas bypass device integrated with the inlet guide vane assembly, utilizing a single driving motor assembly and gas bypass valve assembly to adjust throttle percentages and enable gas bypass, simplifying control and reducing piping complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the IGV and bypass structure are separately constructed, then the compressor can avoid surging at low loading conditions, but the piping complexity and control system complexity increase
Solution Approach 1:
The patent combines the IGV and bypass valve into a single integrated assembly that shares common components including the driving motor, control system, and mounting structure. The bypass valve is positioned within the IGV assembly, allowing both functions to be controlled from a single location with unified actuation mechanisms, thereby reducing piping complexity while maintaining surge prevention capability
Solution Approach 2:
The integrated assembly serves multiple functions simultaneously: the IGV controls inlet flow regulation while the bypass valve provides surge protection by redirecting gas flow. The single driving motor assembly can actuate both the IGV and bypass valve, creating a multi-functional control system that reduces overall system complexity while maintaining reliability
2Reliability
If the IGV and bypass structure are separately constructed, then the compressor can avoid surging at low loading conditions, but the control system complexity increases
Solution Approach 1:
The control system integrates both the IGV and bypass valve control into a single control unit that manages both functions. The driving motor assembly incorporates unified control mechanisms that can actuate either or both components based on operating conditions, reducing control system complexity while maintaining reliable surge prevention
Solution Approach 2:
The control system is designed as a multi-functional unit that can regulate IGV position and control bypass valve position through a single control architecture. This universal control approach reduces the number of separate control systems needed while ensuring reliable operation under varying loading conditions
Data Source
AI summary
An internal hot gas bypass device coupled with inlet guide vane for centrifugal compressor includes an inlet guide vane assembly, a driving motor assembly and a gas bypass valve assembly. The inlet guide vane assembly further includes a master vane, a plurality of slave vanes, a vane-front fixing ring, a vane-rear fixing ring, a vane-driving ring, a connecting pipe and a vane-opening indicating disk. The driving motor assembly further includes a motor, a driving unit and a motor fixing base. The gas bypass valve assembly further includes a valve, an external fixing-and-guiding ring, an internal fixing-and-guiding ring, a driven element, a spring, a sealing ring, a valve stud and a valve base. The driving motor assembly is connected with the driving unit and the master vane of the inlet guide vane assembly via a connecting rod, and is further connected with the slave vanes of the gas bypass valve assembly.