Laminated Gasket Sealing Structure for Partition Wall Compression
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Solution Overview
Problem
The existing sealing structure for casings with laminated gaskets fails to adequately compress beads on partition walls due to the low stiffness of the center plate, leading to deformation and potential leaks, especially under pressure differentials caused by the impeller's rotation, making it impractical to thicken the center plate for cost and weight reduction reasons.
Innovation Solution
Incorporating a protrusion or beam portion on the cover that contacts the partition wall, providing additional contact force to compress the beads and prevent deformation of the center plate, ensuring effective sealing without increasing the center plate's thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the center plate is made thin to reduce weight and cost, then weight and manufacturing cost are reduced, but the center plate deforms under bead reaction force and fails to compress the bead sufficiently
Solution Approach 1:
The partition wall acts as an intermediary structural element between the bead and the center plate. It transmits and distributes the bead's reaction force to a larger area of the center plate, preventing localized deformation while maintaining sufficient compression force for sealing. This allows the center plate to remain thin without sacrificing sealing reliability.
2Reliability
If the center plate is thickened to increase stiffness and prevent deformation, then sealing reliability is improved, but weight and manufacturing cost increase
Solution Approach 1:
The partition wall provides localized structural support precisely where the bead reaction force is applied. This concentrated support at the critical location prevents deformation of the thin center plate without requiring the entire plate to be thickened, thus maintaining low weight while ensuring sealing reliability at the bead contact point.
3Reliability
If the cover is designed to compress the bead at the partition wall, then sealing at the partition wall is improved, but the cover structure becomes more complex
Solution Approach 1:
The partition wall serves multiple functions: it divides the coolant flow path, provides structural support to the center plate under bead load, and acts as a compression surface for the bead sealing portion. By making the partition wall multi-functional, the cover structure remains simple while achieving reliable sealing at the partition wall.
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 effectively suppresses the deformation of the center plate and ensures sufficient compression of the beads on the partition wall, maintaining sealing integrity while avoiding the need for a thicker center plate, thus preventing leaks and ensuring reliable coolant flow.
Implementation Method 1
The fastening of the case 100 and the cover 200 with bolts (not shown) compresses the beads, and the reaction forces of the beads at this time seal the laminated gasket 300 between the case 100 and the cover 200.
Implementation Method 2
a coolant radially emitted by the rotation of the impeller 400
Implementation Method 3
Incorporating a protrusion or beam portion on the cover that contacts the partition wall, providing additional contact force to compress the beads and prevent deformation of the center plate
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
The present invention has an object of providing a sealing structure for a casing that suppresses the deformation of a center plate of a laminated gasket on a partition wall and ensures the compression amount of a bead on the partition wall, without the center plate being thickened. The object is achieved by a sealing structure including: a case 2, the interior of which is partitioned by a partition wall 25 into an upstream chamber 23 and a downstream chamber 24; a cover 3, which forms a flow path for a fluid that causes the upstream chamber 23 and the downstream chamber 24 to be communicated inside; and a laminated gasket 4, in which a first gasket 41, a center plate 43, and a second gasket 42 are laminated, and that is provided between a butting surface 22a of the case 2 and a butting surface 32a of the cover 3, in which the first gasket 41 and the second gasket 42 respectively include beads 41b and 42b along the butting surfaces 22a and 32a, and the first gasket 41 and the center plate 43 respectively include partition-wall sealing portions 41a and 43a along the partition wall 25, the partition-wall sealing portion 41a of the first gasket 41 includes the beads 41b, and the cover 3 is provided with a contact portion 34 that applies a contact force to the partition-wall sealing portion 43a of the center plate 43.