Hydraulic Accumulator Weld Seam Thickness Design
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Solution Overview
Problem
Existing hydraulic accumulators with metal bellows as a movable separating element are limited by mechanical deformation and damage at relatively low pressure levels, preventing reliable operation at higher pressure differences.
Innovation Solution
The hydraulic accumulator design features weld seams on the metal bellows that are dimensioned to match or exceed the thickness of individual membrane disks in the axial direction, ensuring stability and preventing deformation by allowing flat contact between disk pairs in the block position, creating a quasi-monolithic structure that can withstand high pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the metal bellows is designed with conventional weld seams (thinner than membrane disk thickness), then the manufacturing is easier and the structure is simpler, but the bellows deforms and damages at relatively low pressure differences
Solution Approach 1:
The patent changes the critical parameter of weld seam thickness to be greater than the membrane disk thickness, transforming the weld seam from a potential weakness into a strengthening element that prevents deformation and enables high pressure resistance
Solution Approach 2:
The patent introduces a new dimensional relationship by making the weld seam thickness (radial dimension) exceed the membrane disk thickness (axial dimension), creating a three-dimensional reinforcement structure that fundamentally changes the stress distribution and prevents buckling under pressure
2Stability of the object's composition
If the weld seams form axial overhangs beyond the end faces of membrane disks, then the weld seam stability is improved, but the membrane disks deform when the bellows is completely compressed
Solution Approach 1:
The patent applies local quality by ensuring the weld seam thickness is uniformly greater than the membrane disk thickness at critical locations, creating localized reinforcement zones that prevent deformation while maintaining overall structural integrity during compression
Solution Approach 2:
The patent implements preliminary anti-action by designing weld seams that prevent deformation before it can occur, using the excess weld seam material as a preventive measure against buckling and damage during complete compression of the bellows
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 design enhances the service life and stability of the metal bellows, enabling reliable operation at higher pressure differences without risk of damage, as the flat contact between disk pairs prevents deformation and maintains structural integrity under compressive loads.
Implementation Method 1
The high elasticity and the relatively long, permissible axial path when extending and compressing allow a large volume compensation area
Implementation Method 2
the edges of which are mutually connected to one another by weld seams
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A hydraulic accumulator with an accumulator housing (1), in the interior of which a metal bellows (3) is arranged, the metal bellows having a plurality of membrane discs (17, 19), the edges of which are alternately connected to one another by weld seams (21, 23), and the metal bellows forming a movable separating element between a gas side and a fluid side, the volumes of which are changeable by means of extension and compression of the metal bellows (3) taking place in the axial direction. The hydraulic accumulator is characterized in that, in at least some of the membrane discs (17, 19), the weld seams (21, 23) are dimensioned in such a manner that the thickness of the weld seams (21, 23), as measured in the direction of the thickness of the membrane discs (17, 19), is at most the same as the entire thickness of the membrane discs (17 and 19) to be welded together.