Compressor Valve Plate Relieved Area Reduces Reed Stiction
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Solution Overview
Problem
Existing reciprocating piston compressors face issues with valve sealing and stiction due to material deformations and oil films, leading to reduced efficiency and increased stiction, particularly in refrigeration systems using low GWP and natural refrigerants.
Innovation Solution
A compressor valve plate design featuring a trepan with a relieved area that reduces contact between the reed valve and the valve plate, minimizing stiction and accommodating material deformations, along with a reed valve configuration that protrudes over the relieved area to control flow through multiple ports, enhancing valve seating and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reed valve contacts the valve seat with full surface area, then sealing is improved, but stiction increases due to material deformations and oil films
Solution Approach 1:
The patent applies local quality by creating a relieved area with reduced material thickness specifically at the valve seating location. This localized modification allows the reed valve to contact the valve seat in a controlled manner, maintaining sealing effectiveness while reducing the contact area that causes stiction. The relieved area enables the reed to flex and seat properly without the full surface contact that generates harmful friction forces.
2Ease of manufacture
If the valve plate structure is simplified, then manufacturing is easier, but valve seating precision deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-forming the relieved area in the valve plate during manufacturing. This预先 prepared feature ensures that when the reed valve contacts the seat, the proper seating geometry is already in place, achieving precise valve seating without requiring complex post-manufacturing adjustments or highly sophisticated manufacturing processes.
3Stability of the object's composition
If the reed valve is constrained tightly to the valve plate, then structural stability is improved, but material deformations increase under pressure
Solution Approach 1:
The patent applies beforehand cushioning by incorporating the relieved area as a compliance feature in the valve plate structure. This预先 designed feature acts as a cushion that absorbs and accommodates material deformations when pressure differential acts on the reed valve. The relieved area allows controlled flexing and deformation without compromising the overall structural stability of the valve assembly, preventing excessive stress concentration that would lead to harmful deformations.
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 design improves valve seating, reduces stiction, and maintains efficiency by minimizing the impact of gas and lubricant films, debris, and pressure differentials, thereby enhancing the performance of reciprocating piston compressors in refrigeration systems.
Implementation Method 1
minimizing stiction and accommodating material deformations
Implementation Method 2
pressure-actuated valves typically open and close once during each shaft revolution
Data Source
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AI summary
A compressor valve plate (80) for a reed valve (94) has a mounting surface portion for mounting a base portion (104) of a reed (100). The compressor has a port (90). A seat (150) surrounds the port. A trepan (154) surrounds the seat. A relieved area (180, 182) less deep than the trepan extends proximally (182) of and distally (180) of the trepan. A reciprocating piston compressor comprises a valve assembly having such a compressor valve plate and a reed.