Nested Metal Plate Pulsation Damper for Compact Compression Stroke
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Solution Overview
Problem
Conventional pulsation damping members face challenges in securing compression strokes of metal plates in the axial direction while reducing the overall size and minimizing the load on joint parts.
Innovation Solution
The design includes a configuration where the crest portion of one metal plate enters inside the crest portion of another, and the valley portion of one metal plate enters inside the valley portion of the other, with a constricted portion positioned radially outward from the central axis, allowing for deeper compression and reduced axial size, thereby minimizing stress on joint parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If apex portions of valley portion and crest portion abut against each other in axial direction when fluid pressure has risen, then the pulsation damping member can suppress pulsation, but it is difficult to secure compression strokes of metal plates while reducing axial size
Solution Approach 1:
The crest portion of the second metal plate is positioned inside the crest portion of the first metal plate, and the valley portion of the first metal plate is positioned inside the valley portion of the second metal plate. This nested configuration allows the metal plates to achieve greater compression strokes while reducing the overall axial size of the pulsation damping member.
2Length of moving object
If compression strokes of metal plates are secured while reducing axial size, then the pulsation damping member becomes more compact, but load applied to joint parts increases
Solution Approach 1:
A constricted portion is provided in the expansion/contraction space at a position radially outward from the center portion between the central axis and joint parts. This local structural feature allows the constricted portion to bear the load during compression, thereby reducing the load applied to the joint parts while maintaining the reduced axial size.
3Force
If constricted portion is positioned radially outward from center portion, then load on joint parts is suppressed, but the expansion/contraction space geometry becomes more complex
Solution Approach 1:
The expansion/contraction space is segmented into multiple regions by providing a constricted portion at a specific location. This segmentation allows the space to be divided into a first expansion/contraction space and a second expansion/contriction space, with the constricted portion serving as a load-bearing element that reduces stress on joint parts.
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 secures compression strokes while reducing the axial size of the pulsation damping member and suppresses the load on joint parts, preventing further contraction and reducing the rapid increase in spring constant.
Implementation Method 1
the first metal plate and the second metal plate are configured to elastically deform in the axial direction while expanding and contracting the expansion/contraction space in the axial direction in accordance with pulsation of a fluid flowing through the pipe
Data Source
AI summary
A pulsation damping member includes a first metal plate and a second metal plate, a crest portion of the second metal plate enters inside a crest portion of the first metal plate, a valley portion of the first metal plate enters inside a valley portion of the second metal plate, a size in the axial direction of an outer end portion of an expansion/contraction space positioned on an outermost side in a radial direction and continuous with joint parts increases toward an inner side in the radial direction, and a first constricted portion having a smallest size in the axial direction in a portion of the expansion/contraction space positioned on an inner side with respect to the outer end portion in the radial direction is positioned on a radially outward side from a center portion between the central axis and the joint parts in the radial direction.