Scroll Compressor Injection Timing for Higher Refrigerant Flow
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Solution Overview
Problem
Existing air conditioners face limitations in cooling or heating performance, especially under severe external temperatures, requiring large-capacity compressors that increase manufacturing and installation costs, and struggle to achieve overcooling of refrigerant effectively.
Innovation Solution
A scroll compressor design with multiple injection passages and phases that allow for increased refrigerant flow rate by injecting refrigerant at specific pressures and phases, optimizing the refrigerant cycle through a system of injection passages and overcooling devices to enhance cooling/heating performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large-capacity compressor is provided to increase refrigerant circulation amount for severe external air conditions, then cooling/heating performance is improved, but manufacturing and installation costs are increased
Solution Approach 1:
The patent divides the single compression process into multiple stages by providing multiple injection parts (first injection part and second injection part) that inject refrigerant at different positions and timings during the compression cycle. This segmented approach allows efficient compression at moderate capacity while achieving high refrigerant circulation through optimized multi-phase injection timing
Solution Approach 2:
The patent applies preliminary action by injecting refrigerant through the first injection part before the compression chamber is fully formed, and through the second injection part at an intermediate stage. This pre-injection approach allows the compressor to handle larger refrigerant volumes without requiring proportionally larger compression capacity, thereby reducing costs
2Productivity
If evaporation performance of the evaporator is increased to achieve overcooling of refrigerant, then cooling performance is improved, but it becomes difficult to secure overcooling in the system
Solution Approach 1:
The patent employs dynamic control of refrigerant injection timing and positioning through multiple injection parts located at different positions on the orbiting scroll. The injection timing is dynamically adjusted based on the compression phase, allowing optimal refrigerant distribution that maintains overcooling reliability while maximizing evaporation performance
Solution Approach 2:
The patent uses the multiple injection parts as intermediary mechanisms between the refrigerant supply and the compression chamber. These injection parts act as mediators that control refrigerant flow rate, pressure, and timing, enabling precise control over the refrigeration cycle to achieve reliable overcooling while maintaining high evaporation performance
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 increases refrigerant flow rate and improves cooling/heating performance by optimizing the refrigerant cycle, reducing the required compressor power and enhancing efficiency, while allowing for better overcooling capabilities.
Implementation Method 1
an orbiting scroll orbitally moving with respect to the fixed scroll, the orbiting scroll including a second wrap defining a compression chamber together with the first wrap
Implementation Method 2
the indoor heat exchanger servers as an evaporator
Implementation Method 3
the indoor heat exchanger heat-exchanging with indoor air
Implementation Method 4
the outdoor heat exchanger serves as a condenser
Implementation Method 5
the outdoor heat exchanger heat-exchanging with external air
Data Source
AI summary
The scroll compressor includes a fixed scroll including a first wrap, an orbiting scroll disposed to have a phase difference with respect to the fixed scroll, the orbiting scroll including a second wrap defining a compression chamber together with the first wrap, a suction part to receive a refrigerant into the compressor chamber, a driving shaft to transmit a rotation force to the orbiting scroll, a first injection part disposed in one position of the fixed scroll to introduce a refrigerant into the compression chamber, and a second injection part disposed in another position of the fixed scroll to introduce a refrigerant into the compression chamber, where the second wrap is disposed on the orbiting scroll such that the first injection part is opened to introduce the second refrigerant before the receipt of the first refrigerant through the suction part is completed during the orbiting of the orbiting scroll.