In conventional rotary compressors, the external accumulator occupies significant radial space, and simply reducing the outer diameter of the main body soon hits performance bottlenecks.
GMCC Meizhi, with its Integrated Rotary Compressor Key Technology Research and Industrialization project – winner of the First Prize at the 2024 Private Science and Technology Development Contribution Award – offers a groundbreaking solution.
Structural Reconfiguration
The R&D team abandoned the traditional external accumulator design and innovatively adopted a bottom-mounted accumulator structure, integrating it inside the compressor shell.
Results:
Radial size reduced by 30%
Overall unit width reduced by 20% compared to industry mainstream
Application Impact:
Container loading capacity increased by 25%, significantly reducing logistics costs
Outdoor units can be adapted to narrow installation platforms in older residential communities and affordable housing projects
Reduced difficulty and safety risks for high-altitude installation work
Three Key Technological Breakthroughs
Integrating the accumulator internally creates new challenges in oil return, suction superheat control, and gas-liquid separation. Meizhi tackled all three simultaneously.
1. Efficient Two-Phase Flow Separation and Gravity-Reverse Autonomous Oil Return Technology
Challenge: With the accumulator placed at the bottom, lubricating oil must flow upward against gravity to return to the compressor pump. Conventional designs are prone to poor oil return and abnormal wear of moving components.
Solution: Optimized internal piping layout, diameter matching, and oil return hole design.
Outcome: The compressor operates continuously and stably for 3,500 hours under extreme conditions.
2. Near-Stagnation Gas Thermal Insulation Technology
Challenge: Controlling suction preheating loss becomes critical when the accumulator is internal.
Solution: Application of the near-stagnation gas thermal insulation principle in structural design.
Outcome:
Compressor COP increased by 3%
Overall cooling and heating capacity increased by 2% to 3%
System energy efficiency ratio reaches 4.21, surpassing new first-tier energy efficiency standards
3. Gas-Liquid Two-Phase Control Technology
Challenge: Liquid refrigerant entrained in the return flow is a primary cause of liquid slugging damage to the cylinder.
Solution: Precise regulation of the gas-liquid two-phase flow state.
Outcome: Suction pressure loss reduced by 50%, improving energy efficiency while effectively preventing cylinder fatigue damage.
Multidimensional Value of the Breakthrough
This technology has generated 97 patents, backed by hundreds of millions in annual R&D investment and 11 global R&D centers. It redefines compressor miniaturization – achieving a leap from incremental improvement to architectural breakthrough. This delivers cost savings, reduced emissions, and improvements in building space adaptability, logistics efficiency, and installation safety.
The technology provides a miniaturized, high-efficiency paradigm for split air conditioners, multi-split systems, light commercial refrigeration, and heat pumps.
