Scroll Compressor Discharge Valve Seat Segmentation to Reduce Bending
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Solution Overview
Problem
The discharge valve mechanism in scroll compressors experiences bending issues due to high loads, particularly during high-speed or high compression ratio operations, leading to reduced reliability as the valve is not adequately supported, resulting in deformation.
Innovation Solution
Incorporating a valve seat with an annular portion and a valve supporting portion that divides the outlet opening into multiple valve seat holes, allowing the valve to contact these supporting structures, thereby dispersing the load and minimizing bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple plate-shaped valve is used to close the discharge port, then the device complexity is reduced and ease of manufacture is improved, but the valve reliability deteriorates due to bending deformation under high load
Solution Approach 1:
The valve seat is divided into multiple segments: an annular portion forming the outer edge and multiple radially arranged valve supporting portions that divide the outlet opening into multiple valve seat holes. This segmentation provides multiple contact points for the valve, distributing the load and preventing bending deformation while maintaining a relatively simple overall structure.
Solution Approach 2:
The valve supporting portions are strategically positioned to provide localized support exactly where the valve contacts the valve seat. This creates areas of concentrated support (local quality enhancement) at the valve contact points while leaving other areas of the valve seat open for refrigerant flow, optimizing both structural support and functional performance.
2Ease of manufacture
If the valve is supported only at the valve seat edge, then the manufacturing process is simplified, but the valve bends and deforms under operational load
Solution Approach 1:
The valve seat is segmented into an annular portion and multiple radially arranged valve supporting portions. This segmentation provides multiple discrete support points for the valve throughout its contact area, preventing bending and deformation while maintaining a manufacturing process that is only moderately more complex than a simple edge support.
Solution Approach 2:
The valve supporting portions extend radially inward from the annular portion, creating support structures in the radial dimension. This dimensional arrangement distributes support across multiple radii, preventing the valve from bending in any single direction while maintaining manufacturing feasibility through standard machining operations.
3Productivity
If high-speed operation or high compression ratio operation is performed, then the productivity and compression performance are improved, but the load on the valve increases causing increased bending
Solution Approach 1:
The valve seat is divided into multiple segments with radially arranged valve supporting portions that create multiple contact points for the valve. This segmentation distributes the increasing operational load across multiple support points, preventing bending deformation even during high-speed or high compression ratio operations, thereby maintaining valve reliability under high load conditions.
Solution Approach 2:
The valve seat geometry is changed from a simple edge to a multi-component structure with specific radial and axial dimensions. The valve supporting portions are designed with optimized dimensions (radial extent, axial height) to provide adequate support under varying load conditions, allowing the compressor to operate at higher speeds and compression ratios without valve deformation.
Data Source
AI summary
A scroll compressor includes: a shell; a compression mechanism unit accommodated in the shell and defining a compression chamber, the compression mechanism unit having a discharge port through which a discharge chamber and the compression chamber communicate with one another; a discharge valve mechanism that opens and closes the discharge port. The discharge valve mechanism includes a valve seat provided on an outlet portion of the discharge port and a valve and closes the valve seat when sitting on the valve seat. The valve seat includes an annular portion serving as an edge of an opening of the outlet portion and a valve supporting portion that is provided in a region surrounded by the inner circumference of the annular portion and divides the opening of the outlet portion into plural valve seat holes. The valve is in contact with at least a portion of the valve supporting portion and with the annular portion, when sitting on the valve seat.