Reciprocating compressor with vented discharge valve
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Solution Overview
Problem
Reciprocating compressors face inefficiencies due to flow resistance and headspace issues during the top-dead-center condition, which affect the expulsion of compressed fluid and overall compressor performance.
Innovation Solution
The design incorporates an annular discharge valve element with coil springs and vents in the valve guide, along with channels on the piston projection to minimize headspace and enhance flow, allowing for improved fluid expulsion and reduced pressure resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional discharge valve is used, then the structure is simple, but flow resistance increases and headspace expansion is limited during top-dead-center condition
Solution Approach 1:
The discharge valve is segmented into multiple functional components: an annular valve element with radial slots, a valve guide with vents, and spring pockets. This segmentation allows each component to perform a specific function (flow control, pressure equalization, spring accommodation) while collectively improving overall compressor efficiency without excessive complexity
Solution Approach 2:
The invention introduces vertical ventilation channels through the valve guide that provide a new flow dimension. The vents allow pressure equalization in the vertical direction above the valve element, complementing the horizontal radial slots in the valve element, thereby reducing headspace expansion issues in multiple dimensions
2Volume of stationary object
If the piston projection is reduced to minimize headspace, then headspace expansion is reduced, but flow resistance increases
Solution Approach 1:
The flow path is segmented into multiple channels: radial slots in the annular valve element and vertical vents in the valve guide. This segmentation creates multiple parallel flow paths that reduce resistance while maintaining compact headspace volume, as the flow is distributed through numerous small channels rather than requiring a large open space
Solution Approach 2:
The valve element features local quality variations with radial slots positioned at specific locations to optimize flow distribution. The annular element has different functional zones: the body for structural support, the radial slots for primary flow control, and the interaction with valve guide vents for pressure equalization, allowing localized optimization of flow characteristics
3Reliability
If coil springs are used to bias the valve element, then reliable valve closure is achieved, but space requirements increase
Solution Approach 1:
The coil springs are nested within spring pockets that are integrated into the valve guide structure. The springs are accommodated in recesses or cavities formed in the valve guide body, allowing the valve biasing mechanism to be compact and integrated rather than requiring separate external spring housings. This nesting approach maintains reliable valve closure while minimizing the volume occupied by the spring mechanism
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 configuration results in a 1% improvement in compressor efficiency and a 2% capacity increase, with potential for further modifications to enhance performance by optimizing vent and channel designs.
Implementation Method 1
one or more springs held at least partially by the valve guide biasing the valve element from the open condition toward the closed condition
Implementation Method 2
one or more vents in the valve guide providing a flow path from a region above the valve element upward through the valve guide
Data Source
Figure 1
Figure 1A
Figure 1B
AI summary
A compressor (20) comprises: a case (22); and at least one piston (40) mounted for reciprocating movement, each in a respective cylinder (42) of the case. The at least one piston has a peripheral surface (50) and an upper surface (52). At least one discharge valve comprises: a valve element (150) shiftable between a closed condition and an open condition; a valve guide (170); one or more springs (180) held at least partially the valve guide biasing the valve element from the open condition toward the closed condition; and one or more vents (300) in the valve guide providing a flow path from a region above the valve element upward through the valve guide.