Dual-Clutch Compressor Unloading for Diesel-Electric Transition
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Solution Overview
Problem
Existing refrigerant compressor systems lack efficient mechanisms for coupling and decoupling the compressor with a prime mover, leading to suboptimal fuel efficiency and limited control over refrigeration systems, especially when transitioning between power sources.
Innovation Solution
A dual-clutch system comprising a centrifugal clutch and an electric clutch is used to selectively couple and decouple the compressor with a prime mover, allowing for continuous operation of the diesel engine for airflow while using an electric motor for refrigeration, enabling finer temperature control and reduced compressor wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single clutch system is used to couple the compressor with the prime mover, then the device complexity is reduced, but the control precision and ability to transition between power sources deteriorates
Solution Approach 1:
The clutch system is segmented into two independent clutches: a centrifugal clutch for mechanical coupling and an electric clutch for electrical coupling. Each clutch handles a specific function, allowing precise control over power transmission from different sources (prime mover and electric motor) to the compressor, thereby resolving the contradiction between device complexity and control precision.
2Ease of repair
If the compressor is completely disengaged from the housing for belt replacement, then the ease of repair is improved, but the time required for maintenance increases
Solution Approach 1:
The clutch assembly is designed with dynamic coupling capabilities, allowing the compressor to be selectively engaged or disengaged from the drive shaft. During belt replacement, only the electric clutch needs to be disengaged while the compressor remains mechanically connected to the housing, enabling quick maintenance without full disassembly and reducing maintenance time.
3Reliability
If the diesel engine operates continuously to power the compressor, then the reliability of refrigeration is improved, but the fuel economy deteriorates
Solution Approach 1:
The system dynamically switches between power sources based on operational needs. The centrifugal clutch handles prime mover (diesel engine) coupling while the electric clutch handles electric motor coupling. This allows the diesel engine to run continuously for airflow while the electric motor provides refrigeration power, optimizing fuel economy while maintaining refrigeration reliability through on/off control.
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 solution enhances fuel economy by allowing continuous diesel engine operation for airflow, reduces compressor wear, and facilitates easier belt replacement, while providing on/off refrigeration control and extended compressor life.
Implementation Method 1
a selectively energizable electromagnetic coil is coupled to the compressor housing. The armature plate is selectively engagable with the compressor rotor to transmit rotation of the output member to the compressor shaft
Implementation Method 2
A centrifugal clutch is positioned within the housing and includes a prime mover rotor rigidly coupled to the drive shaft and an output member that is selectively coupled to the prime mover rotor for rotation therewith
Data Source
AI summary
A refrigerant compressor system including a prime mover, a compressor, and an unloader device that couples the compressor to the prime mover. The unloading device includes a centrifugal clutch and an electric clutch.