Integrated Filter Accumulator for Low-Frequency Hydraulic Pulsation
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Solution Overview
Problem
Existing hydraulic damping devices are unsuitable for low-frequency fluid flows with high throughput quantities, such as those encountered in demolition hammers, due to their complex design and inability to efficiently dampen a wide frequency range, requiring separate filter devices that increase installation space and costs.
Innovation Solution
A combined device with a membrane accumulator and a filter device in a single housing, featuring a flexible elastomeric separating membrane and a bypass valve, allows for efficient damping of low-frequency flows and high throughput, eliminating the need for separate filter and damper connections, and enabling universal application through adaptable filter elements and membrane accumulators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple Helmholtz resonators are created to damp different frequencies, then the frequency damping capability is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies a single Helmholtz resonator design that can effectively dampen a broad frequency range rather than requiring multiple specialized resonators for different frequencies. The resonator is designed with specific geometric parameters (opening area, neck length, volume) that enable it to handle the wide frequency spectrum generated by variable-speed drives, thereby achieving multi-frequency damping capability with a single universal component instead of multiple frequency-specific components.
2Reliability
If a separate filter device is used, then the filtration function is improved, but the installation space increases
Solution Approach 1:
The patent merges the filter device and the damping device into a single integrated unit. The filter element is positioned within the damping housing, and the Helmholtz resonator is formed using the filter element's structure and the available space within the same housing. This combination eliminates the need for separate connecting piping between independent filter and damper components, thereby reducing the overall installation space while maintaining both filtration and damping functions.
3Measurement precision
If multiple Helmholtz resonators are tuned to specific frequencies, then the damping precision for specific frequencies is improved, but the device complexity increases
Solution Approach 1:
The patent designs the Helmholtz resonator with specific geometric parameters (opening area A, neck length L, and volume V) that are optimized to dampen a broad frequency range. Rather than creating multiple resonators tuned to specific frequencies, the design adjusts these parameters to achieve effective damping across the wide frequency spectrum generated by variable-speed drives, thereby maintaining damping precision without increasing device complexity.
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 solution provides reliable, cost-effective damping and filtration for a wide range of applications, ensuring efficient operation by adapting to fluid flow frequencies and quantities, reducing installation space, and allowing for quick maintenance and replacement of components.
Implementation Method 1
the damping device 12 has a hydraulic accumulator 28, which, with its movable separating element 30, separates two fluid chambers 32, 34 from one another
Implementation Method 2
the separating element is designed as an elastomeric separating membrane that is elastically flexible under the action of the fluid flow
Implementation Method 3
the filter device 10 has a filter element 36, the element material 38 of which extends between an upper end cap 40 and a lower end cap 42
Implementation Method 4
a damping tube 13 located in the flow path between them, which, in order to form a Helmholtz resonator, has, in a region located within its length, at least one branch opening 19 passing through the tube wall
Data Source
Figure 1
Figure 2
AI summary
2. Device comprising at least one filter unit (10) and a damping unit (12) combined in a housing (14) which has an inlet (16) for an unfiltrate flow which reaches the unfiltrate side (20) of the filter unit (10) via a fluid connection (18), the filtrate side (22) of which is fluid-carrying connected to an outlet (24) in the housing (14) for the discharge of a filtrate flow, wherein the damping unit (12) is connected via a connection (26) to the fluid connection (18) to the unfiltrate side (20) of the filter unit (10), characterized in that the damping unit (12) has a hydraulic accumulator (28) which, with its movable separating element (30), separates two fluid chambers (32, 34) from each other,of which one fluid chamber (32) serves to hold a compressible medium and the other fluid chamber (34) is designed as a damping chamber and is connected via the connection (26) to the fluid connection (18) to the unfiltered side (20) of the filter device (10).