Scroll Compressor Fixed Scroll Discharge Hole Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional scroll compressors experience discharge loss and dead volume loss due to the thick fixed scroll design, which increases unnecessary energy consumption and reduces efficiency, as the refrigerant interacts with the fixed scroll and requires additional components like mufflers for proper discharge.
Innovation Solution
The compressor design reduces the thickness of the fixed scroll's head plate, minimizes the length of the discharge hole, and incorporates a bypass hole to guide the refrigerant efficiently, reducing contact with the muffler and minimizing dead volume, thereby enhancing discharge efficiency and reducing energy losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the fixed scroll is designed with a thick head plate to accommodate the rotary shaft firmly, then the coupling strength is improved, but the discharge loss and dead volume loss are increased
Solution Approach 1:
The head plate is divided into two functional zones: a thick shaft accommodation portion for firm coupling and a thin discharge hole region for minimal refrigerant contact. This segmentation allows each area to have optimized thickness for its specific function, resolving the contradiction between coupling strength and discharge loss.
Solution Approach 2:
The head plate exhibits non-uniform thickness distribution, being thick only where the rotary shaft is accommodated and thin where the discharge hole is located. This local quality variation ensures strong coupling where needed while minimizing discharge loss in the discharge region.
2Stability of the object's composition
If the fixed scroll is designed with a thick head plate, then the structural stability is improved, but the dead volume loss is increased
Solution Approach 1:
The head plate structure is segmented into a thick shaft accommodation portion for structural stability and a thin discharge region to minimize dead volume. This segmentation allows the structure to be stable where needed while reducing unnecessary volume in the discharge area.
Solution Approach 2:
The head plate has locally varied thickness: thick in the shaft accommodation area for stability and thin in the discharge hole area to reduce dead volume. This local quality differentiation resolves the contradiction between structural stability and dead volume loss.
3Strength
If the discharge hole is made long to pass through the thick head plate, then the structural integrity is maintained, but the refrigerant flow length is increased
Solution Approach 1:
The discharge hole is positioned to pass through only the thin discharge region of the head plate, not the thick shaft accommodation portion. This segmentation of the discharge path minimizes refrigerant flow length while the thick shaft portion maintains structural integrity independently.
Solution Approach 2:
The discharge hole is located in the thin discharge region where the head plate has minimal thickness, reducing refrigerant flow length. The thick shaft accommodation portion maintains structural integrity separately, resolving the contradiction between structural integrity and refrigerant flow length.
4Device complexity
If the fixed scroll is positioned at the outermost side, then the assembly is simplified, but the discharge loss is increased due to refrigerant contact
Solution Approach 1:
The discharge hole extracts the refrigerant discharge function from the thick head plate structure, creating a dedicated thin discharge region. This separation allows the fixed scroll to be positioned at the outermost side for simple assembly while the extracted discharge hole minimizes refrigerant contact loss.
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3(a)~3(d)
AI summary
Scroll compressor in which the discharge hole (326) is formed to have an axial length less than an axial length of the fixed shaft accommodation portion (3281), thereby increasing efficiency.