SMA Valve with Integrated Housing for Reduced Assembly
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Solution Overview
Problem
Existing valve systems utilizing shape memory alloys (SMAs) are costly and labor-intensive due to the numerous components required for operation, leading to high material costs and complex assembly processes.
Innovation Solution
A valve design that integrates components into a single intermediate housing, reducing the number of separate parts by using a housing lid, bottom, and intermediate housing to enclose a valve chamber, with a SMA element and printed circuit board for actuation, allowing for simplified assembly and reduced material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If numerous separate components (shielding wall, sealing elements, guides, electronic components) are used to ensure valve functionality, then reliability and functionality are improved, but material costs and manufacturing complexity increase significantly
Solution Approach 1:
The patent combines multiple separate components (shielding wall, sealing elements, guides, and housing) into a single integrated housing structure. The housing serves multiple functions simultaneously: it provides structural enclosure, sealing, guiding for the actuator, and shielding. This merging reduces the number of individual parts while maintaining all necessary valve functions, directly resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The housing is designed as a multi-functional component that performs several roles at once: it acts as the structural frame, provides sealing surfaces, guides actuator movement, and offers electromagnetic shielding. By making the housing universal and multi-functional, the patent eliminates the need for separate specialized components, thereby reducing complexity while preserving reliability.
2Reliability
If numerous separate components are used for valve operation, then functional requirements are met, but assembly effort and manufacturing expense increase
Solution Approach 1:
By merging multiple components into a single housing unit, the patent reduces the number of assembly steps required. Instead of assembling separate shielding walls, sealing elements, and guides, the integrated housing is installed as one piece, significantly reducing assembly effort and manufacturing expense while maintaining full operational functionality.
Solution Approach 2:
The patent segments the valve into two main parts: the integrated housing (containing all structural, sealing, and guiding functions) and the actuator assembly. This segmentation allows the housing to be manufactured and prepared in advance, simplifying the final assembly process where only the actuator needs to be installed.
3Ease of operation
If SMA element is directly exposed to fluid flow through valve chamber, then actuation is simplified, but temperature control precision deteriorates due to fluid warming/cooling effects
Solution Approach 1:
The patent segments the valve chamber into two distinct areas: a flow chamber for fluid passage and an actuation chamber for the SMA element. This segmentation physically separates the fluid flow path from the actuation zone, allowing precise temperature control of the SMA element while maintaining simple actuation operation. The flow chamber handles fluid dynamics while the actuation chamber maintains thermal stability.
Solution Approach 2:
The patent introduces an intermediary thermal management system (including heat sinks and thermal isolation structures) between the fluid flow and the SMA element. This intermediary protects the temperature-sensitive SMA element from direct fluid temperature variations, enabling precise temperature control while preserving the simplicity of electrical actuation.
4Device complexity
If fluid flow path includes components necessary for valve actuation, then integrated design is achieved, but pneumatic resistance and noise increase
Solution Approach 1:
The patent segments the internal volume into separate flow and actuation chambers, creating distinct pathways for fluid flow and actuator operation. This segmentation allows the fluid to flow through an optimized path without encountering actuation components, minimizing pneumatic resistance and noise while maintaining integrated design benefits.
Solution Approach 2:
The patent uses the housing structure as an intermediary that separates fluid flow paths from actuation components. The housing walls and internal partitions act as barriers that guide fluid flow efficiently while isolating it from the actuator, reducing turbulence and pneumatic resistance despite the integrated design.
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 reduces material costs, simplifies assembly, and enhances the SMA element's service life by allowing precise temperature control, lowering current requirements, and minimizing pneumatic resistance and noise.
Implementation Method 1
a wire- or band-shaped SMA element made of a shape memory alloy... At room temperature, there is a martensitic structure with a tetragonal body-centered lattice, which starting at a transformation temperature of about 80° C., undergoes a transformation to become an austenitic structure with a cubic face-centered lattice. Therefore, a wire from such a shape memory alloy has the property to shorten when heated up via the transformation temperature owing to the transformation of the lattice from a martensitic to an austenitic structure.
Implementation Method 2
To heat up the SMA element, an electric current is usually applied on it, thereby shortening it so it can thus move the actuator.
Data Source
AI summary
A valve has a valve housing with a lid, bottom, and an intermediate housing portion between the lid and bottom. The valve housing encloses a valve chamber with at least one valve opening and at least one axially movable actuator movable between a closing position to close the valve opening and an opening position to release the valve opening, one wire- or band-shaped SMA element made of a shape memory alloy to activate the actuator in the opening direction, one return element to move the actuator in the closing direction, and one printed circuit board. The SMA element is attached to the actuator at a middle section and is electrically connected at its ends to the printed circuit board to be supplied with an electrical current. A valve arrangement includes several of such valves.